[PATCH 1/2] ALSA: ppc: drop if block with always false condition
The remove callback is only called for devices that were probed successfully before. As the matching probe function cannot complete without error if dev->match_id != PS3_MATCH_ID_SOUND, we don't have to check this here.
Signed-off-by: Uwe Kleine-König u.kleine-koenig@pengutronix.de --- sound/ppc/snd_ps3.c | 2 -- 1 file changed, 2 deletions(-)
diff --git a/sound/ppc/snd_ps3.c b/sound/ppc/snd_ps3.c index 58bb49fff184..6ab796a5d936 100644 --- a/sound/ppc/snd_ps3.c +++ b/sound/ppc/snd_ps3.c @@ -1053,8 +1053,6 @@ static int snd_ps3_driver_remove(struct ps3_system_bus_device *dev) { int ret; pr_info("%s:start id=%d\n", __func__, dev->match_id); - if (dev->match_id != PS3_MATCH_ID_SOUND) - return -ENXIO;
/* * ctl and preallocate buffer will be freed in
The driver core ignores the return value of struct device_driver::remove because there is only little that can be done. For the shutdown callback it's ps3_system_bus_shutdown() which ignores the return value.
To simplify the quest to make struct device_driver::remove return void, let struct ps3_system_bus_driver::remove return void, too. All users already unconditionally return 0, this commit makes it obvious that returning an error code is a bad idea and ensures future users behave accordingly.
Signed-off-by: Uwe Kleine-König u.kleine-koenig@pengutronix.de --- arch/powerpc/include/asm/ps3.h | 4 ++-- arch/powerpc/platforms/ps3/system-bus.c | 5 ++--- drivers/block/ps3disk.c | 3 +-- drivers/block/ps3vram.c | 3 +-- drivers/char/ps3flash.c | 3 +-- drivers/net/ethernet/toshiba/ps3_gelic_net.c | 3 +-- drivers/ps3/ps3-lpm.c | 3 +-- drivers/ps3/ps3-vuart.c | 10 ++++------ drivers/scsi/ps3rom.c | 3 +-- drivers/usb/host/ehci-ps3.c | 4 +--- drivers/usb/host/ohci-ps3.c | 4 +--- drivers/video/fbdev/ps3fb.c | 4 +--- sound/ppc/snd_ps3.c | 3 +-- 13 files changed, 18 insertions(+), 34 deletions(-)
diff --git a/arch/powerpc/include/asm/ps3.h b/arch/powerpc/include/asm/ps3.h index cb89e4bf55ce..e646c7f218bc 100644 --- a/arch/powerpc/include/asm/ps3.h +++ b/arch/powerpc/include/asm/ps3.h @@ -378,8 +378,8 @@ struct ps3_system_bus_driver { enum ps3_match_sub_id match_sub_id; struct device_driver core; int (*probe)(struct ps3_system_bus_device *); - int (*remove)(struct ps3_system_bus_device *); - int (*shutdown)(struct ps3_system_bus_device *); + void (*remove)(struct ps3_system_bus_device *); + void (*shutdown)(struct ps3_system_bus_device *); /* int (*suspend)(struct ps3_system_bus_device *, pm_message_t); */ /* int (*resume)(struct ps3_system_bus_device *); */ }; diff --git a/arch/powerpc/platforms/ps3/system-bus.c b/arch/powerpc/platforms/ps3/system-bus.c index c62aaa29a9d5..b431f41c6cb5 100644 --- a/arch/powerpc/platforms/ps3/system-bus.c +++ b/arch/powerpc/platforms/ps3/system-bus.c @@ -382,7 +382,6 @@ static int ps3_system_bus_probe(struct device *_dev)
static int ps3_system_bus_remove(struct device *_dev) { - int result = 0; struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev); struct ps3_system_bus_driver *drv;
@@ -393,13 +392,13 @@ static int ps3_system_bus_remove(struct device *_dev) BUG_ON(!drv);
if (drv->remove) - result = drv->remove(dev); + drv->remove(dev); else dev_dbg(&dev->core, "%s:%d %s: no remove method\n", __func__, __LINE__, drv->core.name);
pr_debug(" <- %s:%d: %s\n", __func__, __LINE__, dev_name(&dev->core)); - return result; + return 0; }
static void ps3_system_bus_shutdown(struct device *_dev) diff --git a/drivers/block/ps3disk.c b/drivers/block/ps3disk.c index 7b55811c2a81..ba3ece56cbb3 100644 --- a/drivers/block/ps3disk.c +++ b/drivers/block/ps3disk.c @@ -507,7 +507,7 @@ static int ps3disk_probe(struct ps3_system_bus_device *_dev) return error; }
-static int ps3disk_remove(struct ps3_system_bus_device *_dev) +static void ps3disk_remove(struct ps3_system_bus_device *_dev) { struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core); struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); @@ -526,7 +526,6 @@ static int ps3disk_remove(struct ps3_system_bus_device *_dev) kfree(dev->bounce_buf); kfree(priv); ps3_system_bus_set_drvdata(_dev, NULL); - return 0; }
static struct ps3_system_bus_driver ps3disk = { diff --git a/drivers/block/ps3vram.c b/drivers/block/ps3vram.c index 1088798c8dd0..b71d28372ef3 100644 --- a/drivers/block/ps3vram.c +++ b/drivers/block/ps3vram.c @@ -797,7 +797,7 @@ static int ps3vram_probe(struct ps3_system_bus_device *dev) return error; }
-static int ps3vram_remove(struct ps3_system_bus_device *dev) +static void ps3vram_remove(struct ps3_system_bus_device *dev) { struct ps3vram_priv *priv = ps3_system_bus_get_drvdata(dev);
@@ -817,7 +817,6 @@ static int ps3vram_remove(struct ps3_system_bus_device *dev) free_pages((unsigned long) priv->xdr_buf, get_order(XDR_BUF_SIZE)); kfree(priv); ps3_system_bus_set_drvdata(dev, NULL); - return 0; }
static struct ps3_system_bus_driver ps3vram = { diff --git a/drivers/char/ps3flash.c b/drivers/char/ps3flash.c index 1a07fee33f66..23871cde41fb 100644 --- a/drivers/char/ps3flash.c +++ b/drivers/char/ps3flash.c @@ -403,7 +403,7 @@ static int ps3flash_probe(struct ps3_system_bus_device *_dev) return error; }
-static int ps3flash_remove(struct ps3_system_bus_device *_dev) +static void ps3flash_remove(struct ps3_system_bus_device *_dev) { struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
@@ -413,7 +413,6 @@ static int ps3flash_remove(struct ps3_system_bus_device *_dev) kfree(ps3_system_bus_get_drvdata(&dev->sbd)); ps3_system_bus_set_drvdata(&dev->sbd, NULL); ps3flash_dev = NULL; - return 0; }
diff --git a/drivers/net/ethernet/toshiba/ps3_gelic_net.c b/drivers/net/ethernet/toshiba/ps3_gelic_net.c index d9a5722f561b..3d1fc8d2ca66 100644 --- a/drivers/net/ethernet/toshiba/ps3_gelic_net.c +++ b/drivers/net/ethernet/toshiba/ps3_gelic_net.c @@ -1791,7 +1791,7 @@ static int ps3_gelic_driver_probe(struct ps3_system_bus_device *dev) * ps3_gelic_driver_remove - remove a device from the control of this driver */
-static int ps3_gelic_driver_remove(struct ps3_system_bus_device *dev) +static void ps3_gelic_driver_remove(struct ps3_system_bus_device *dev) { struct gelic_card *card = ps3_system_bus_get_drvdata(dev); struct net_device *netdev0; @@ -1840,7 +1840,6 @@ static int ps3_gelic_driver_remove(struct ps3_system_bus_device *dev) ps3_close_hv_device(dev);
pr_debug("%s: done\n", __func__); - return 0; }
static struct ps3_system_bus_driver ps3_gelic_driver = { diff --git a/drivers/ps3/ps3-lpm.c b/drivers/ps3/ps3-lpm.c index e54aa2d82f50..65512b6cc6fd 100644 --- a/drivers/ps3/ps3-lpm.c +++ b/drivers/ps3/ps3-lpm.c @@ -1196,7 +1196,7 @@ static int ps3_lpm_probe(struct ps3_system_bus_device *dev) return 0; }
-static int ps3_lpm_remove(struct ps3_system_bus_device *dev) +static void ps3_lpm_remove(struct ps3_system_bus_device *dev) { dev_dbg(&dev->core, " -> %s:%u:\n", __func__, __LINE__);
@@ -1206,7 +1206,6 @@ static int ps3_lpm_remove(struct ps3_system_bus_device *dev) lpm_priv = NULL;
dev_info(&dev->core, " <- %s:%u:\n", __func__, __LINE__); - return 0; }
static struct ps3_system_bus_driver ps3_lpm_driver = { diff --git a/drivers/ps3/ps3-vuart.c b/drivers/ps3/ps3-vuart.c index 4ed131eaff51..e34ae6a442c7 100644 --- a/drivers/ps3/ps3-vuart.c +++ b/drivers/ps3/ps3-vuart.c @@ -1102,7 +1102,7 @@ static int ps3_vuart_cleanup(struct ps3_system_bus_device *dev) * device can no longer be used. */
-static int ps3_vuart_remove(struct ps3_system_bus_device *dev) +static void ps3_vuart_remove(struct ps3_system_bus_device *dev) { struct ps3_vuart_port_priv *priv = to_port_priv(dev); struct ps3_vuart_port_driver *drv; @@ -1118,7 +1118,7 @@ static int ps3_vuart_remove(struct ps3_system_bus_device *dev) dev_dbg(&dev->core, "%s:%d: no driver bound\n", __func__, __LINE__); mutex_unlock(&vuart_bus_priv.probe_mutex); - return 0; + return; }
drv = ps3_system_bus_dev_to_vuart_drv(dev); @@ -1141,7 +1141,6 @@ static int ps3_vuart_remove(struct ps3_system_bus_device *dev)
dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__); mutex_unlock(&vuart_bus_priv.probe_mutex); - return 0; }
/** @@ -1154,7 +1153,7 @@ static int ps3_vuart_remove(struct ps3_system_bus_device *dev) * sequence. */
-static int ps3_vuart_shutdown(struct ps3_system_bus_device *dev) +static void ps3_vuart_shutdown(struct ps3_system_bus_device *dev) { struct ps3_vuart_port_driver *drv;
@@ -1169,7 +1168,7 @@ static int ps3_vuart_shutdown(struct ps3_system_bus_device *dev) dev_dbg(&dev->core, "%s:%d: no driver bound\n", __func__, __LINE__); mutex_unlock(&vuart_bus_priv.probe_mutex); - return 0; + return; }
drv = ps3_system_bus_dev_to_vuart_drv(dev); @@ -1193,7 +1192,6 @@ static int ps3_vuart_shutdown(struct ps3_system_bus_device *dev) dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__);
mutex_unlock(&vuart_bus_priv.probe_mutex); - return 0; }
static int __init ps3_vuart_bus_init(void) diff --git a/drivers/scsi/ps3rom.c b/drivers/scsi/ps3rom.c index f75c0b5cd587..ccb5771f1cb7 100644 --- a/drivers/scsi/ps3rom.c +++ b/drivers/scsi/ps3rom.c @@ -402,7 +402,7 @@ static int ps3rom_probe(struct ps3_system_bus_device *_dev) return error; }
-static int ps3rom_remove(struct ps3_system_bus_device *_dev) +static void ps3rom_remove(struct ps3_system_bus_device *_dev) { struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core); struct Scsi_Host *host = ps3_system_bus_get_drvdata(&dev->sbd); @@ -412,7 +412,6 @@ static int ps3rom_remove(struct ps3_system_bus_device *_dev) scsi_host_put(host); ps3_system_bus_set_drvdata(&dev->sbd, NULL); kfree(dev->bounce_buf); - return 0; }
static struct ps3_system_bus_driver ps3rom = { diff --git a/drivers/usb/host/ehci-ps3.c b/drivers/usb/host/ehci-ps3.c index fb52133c3557..98568b046a1a 100644 --- a/drivers/usb/host/ehci-ps3.c +++ b/drivers/usb/host/ehci-ps3.c @@ -200,7 +200,7 @@ static int ps3_ehci_probe(struct ps3_system_bus_device *dev) return result; }
-static int ps3_ehci_remove(struct ps3_system_bus_device *dev) +static void ps3_ehci_remove(struct ps3_system_bus_device *dev) { unsigned int tmp; struct usb_hcd *hcd = ps3_system_bus_get_drvdata(dev); @@ -227,8 +227,6 @@ static int ps3_ehci_remove(struct ps3_system_bus_device *dev)
ps3_dma_region_free(dev->d_region); ps3_close_hv_device(dev); - - return 0; }
static int __init ps3_ehci_driver_register(struct ps3_system_bus_driver *drv) diff --git a/drivers/usb/host/ohci-ps3.c b/drivers/usb/host/ohci-ps3.c index f77cd6af0ccf..4f5af929c3e4 100644 --- a/drivers/usb/host/ohci-ps3.c +++ b/drivers/usb/host/ohci-ps3.c @@ -184,7 +184,7 @@ static int ps3_ohci_probe(struct ps3_system_bus_device *dev) return result; }
-static int ps3_ohci_remove(struct ps3_system_bus_device *dev) +static void ps3_ohci_remove(struct ps3_system_bus_device *dev) { unsigned int tmp; struct usb_hcd *hcd = ps3_system_bus_get_drvdata(dev); @@ -212,8 +212,6 @@ static int ps3_ohci_remove(struct ps3_system_bus_device *dev)
ps3_dma_region_free(dev->d_region); ps3_close_hv_device(dev); - - return 0; }
static int __init ps3_ohci_driver_register(struct ps3_system_bus_driver *drv) diff --git a/drivers/video/fbdev/ps3fb.c b/drivers/video/fbdev/ps3fb.c index 203c254f8f6c..2fe08b67eda7 100644 --- a/drivers/video/fbdev/ps3fb.c +++ b/drivers/video/fbdev/ps3fb.c @@ -1208,7 +1208,7 @@ static int ps3fb_probe(struct ps3_system_bus_device *dev) return retval; }
-static int ps3fb_shutdown(struct ps3_system_bus_device *dev) +static void ps3fb_shutdown(struct ps3_system_bus_device *dev) { struct fb_info *info = ps3_system_bus_get_drvdata(dev); u64 xdr_lpar = ps3_mm_phys_to_lpar(__pa(ps3fb_videomemory.address)); @@ -1241,8 +1241,6 @@ static int ps3fb_shutdown(struct ps3_system_bus_device *dev) lv1_gpu_memory_free(ps3fb.memory_handle); ps3_close_hv_device(dev); dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__); - - return 0; }
static struct ps3_system_bus_driver ps3fb_driver = { diff --git a/sound/ppc/snd_ps3.c b/sound/ppc/snd_ps3.c index 6ab796a5d936..8e44fa5d4dc7 100644 --- a/sound/ppc/snd_ps3.c +++ b/sound/ppc/snd_ps3.c @@ -1049,7 +1049,7 @@ static int snd_ps3_driver_probe(struct ps3_system_bus_device *dev) }; /* snd_ps3_probe */
/* called when module removal */ -static int snd_ps3_driver_remove(struct ps3_system_bus_device *dev) +static void snd_ps3_driver_remove(struct ps3_system_bus_device *dev) { int ret; pr_info("%s:start id=%d\n", __func__, dev->match_id); @@ -1075,7 +1075,6 @@ static int snd_ps3_driver_remove(struct ps3_system_bus_device *dev) lv1_gpu_device_unmap(2); ps3_close_hv_device(dev); pr_info("%s:end id=%d\n", __func__, dev->match_id); - return 0; } /* snd_ps3_remove */
static struct ps3_system_bus_driver snd_ps3_bus_driver_info = {
Hi Uwe,
On Thu, Nov 26, 2020 at 6:03 PM Uwe Kleine-König u.kleine-koenig@pengutronix.de wrote:
The driver core ignores the return value of struct device_driver::remove because there is only little that can be done. For the shutdown callback it's ps3_system_bus_shutdown() which ignores the return value.
To simplify the quest to make struct device_driver::remove return void, let struct ps3_system_bus_driver::remove return void, too. All users already unconditionally return 0, this commit makes it obvious that returning an error code is a bad idea and ensures future users behave accordingly.
Signed-off-by: Uwe Kleine-König u.kleine-koenig@pengutronix.de
Thanks for your patch!
Reviewed-by: Geert Uytterhoeven geert@linux-m68k.org
Note that the same can be done for ps3_vuart_port_driver.remove().
Gr{oetje,eeting}s,
Geert
On 11/26/20 8:59 AM, Uwe Kleine-König wrote:
The driver core ignores the return value of struct device_driver::remove because there is only little that can be done. For the shutdown callback it's ps3_system_bus_shutdown() which ignores the return value.
To simplify the quest to make struct device_driver::remove return void, let struct ps3_system_bus_driver::remove return void, too. All users already unconditionally return 0, this commit makes it obvious that returning an error code is a bad idea and ensures future users behave accordingly.
Signed-off-by: Uwe Kleine-König u.kleine-koenig@pengutronix.de
Seems OK with v5.9 on PS3.
Tested by: Geoff Levand geoff@infradead.org
On Thu, 26 Nov 2020 17:59:50 +0100, Uwe Kleine-König wrote:
The driver core ignores the return value of struct device_driver::remove because there is only little that can be done. For the shutdown callback it's ps3_system_bus_shutdown() which ignores the return value.
To simplify the quest to make struct device_driver::remove return void, let struct ps3_system_bus_driver::remove return void, too. All users already unconditionally return 0, this commit makes it obvious that returning an error code is a bad idea and ensures future users behave accordingly.
Signed-off-by: Uwe Kleine-König u.kleine-koenig@pengutronix.de
For the sound bit: Acked-by: Takashi Iwai tiwai@suse.de
thanks,
Takashi
arch/powerpc/include/asm/ps3.h | 4 ++-- arch/powerpc/platforms/ps3/system-bus.c | 5 ++--- drivers/block/ps3disk.c | 3 +-- drivers/block/ps3vram.c | 3 +-- drivers/char/ps3flash.c | 3 +-- drivers/net/ethernet/toshiba/ps3_gelic_net.c | 3 +-- drivers/ps3/ps3-lpm.c | 3 +-- drivers/ps3/ps3-vuart.c | 10 ++++------ drivers/scsi/ps3rom.c | 3 +-- drivers/usb/host/ehci-ps3.c | 4 +--- drivers/usb/host/ohci-ps3.c | 4 +--- drivers/video/fbdev/ps3fb.c | 4 +--- sound/ppc/snd_ps3.c | 3 +-- 13 files changed, 18 insertions(+), 34 deletions(-)
diff --git a/arch/powerpc/include/asm/ps3.h b/arch/powerpc/include/asm/ps3.h index cb89e4bf55ce..e646c7f218bc 100644 --- a/arch/powerpc/include/asm/ps3.h +++ b/arch/powerpc/include/asm/ps3.h @@ -378,8 +378,8 @@ struct ps3_system_bus_driver { enum ps3_match_sub_id match_sub_id; struct device_driver core; int (*probe)(struct ps3_system_bus_device *);
- int (*remove)(struct ps3_system_bus_device *);
- int (*shutdown)(struct ps3_system_bus_device *);
- void (*remove)(struct ps3_system_bus_device *);
- void (*shutdown)(struct ps3_system_bus_device *);
/* int (*suspend)(struct ps3_system_bus_device *, pm_message_t); */ /* int (*resume)(struct ps3_system_bus_device *); */ }; diff --git a/arch/powerpc/platforms/ps3/system-bus.c b/arch/powerpc/platforms/ps3/system-bus.c index c62aaa29a9d5..b431f41c6cb5 100644 --- a/arch/powerpc/platforms/ps3/system-bus.c +++ b/arch/powerpc/platforms/ps3/system-bus.c @@ -382,7 +382,6 @@ static int ps3_system_bus_probe(struct device *_dev)
static int ps3_system_bus_remove(struct device *_dev) {
- int result = 0; struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev); struct ps3_system_bus_driver *drv;
@@ -393,13 +392,13 @@ static int ps3_system_bus_remove(struct device *_dev) BUG_ON(!drv);
if (drv->remove)
result = drv->remove(dev);
drv->remove(dev);else dev_dbg(&dev->core, "%s:%d %s: no remove method\n", __func__, __LINE__, drv->core.name);
pr_debug(" <- %s:%d: %s\n", __func__, __LINE__, dev_name(&dev->core));
- return result;
- return 0;
}
static void ps3_system_bus_shutdown(struct device *_dev) diff --git a/drivers/block/ps3disk.c b/drivers/block/ps3disk.c index 7b55811c2a81..ba3ece56cbb3 100644 --- a/drivers/block/ps3disk.c +++ b/drivers/block/ps3disk.c @@ -507,7 +507,7 @@ static int ps3disk_probe(struct ps3_system_bus_device *_dev) return error; }
-static int ps3disk_remove(struct ps3_system_bus_device *_dev) +static void ps3disk_remove(struct ps3_system_bus_device *_dev) { struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core); struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); @@ -526,7 +526,6 @@ static int ps3disk_remove(struct ps3_system_bus_device *_dev) kfree(dev->bounce_buf); kfree(priv); ps3_system_bus_set_drvdata(_dev, NULL);
- return 0;
}
static struct ps3_system_bus_driver ps3disk = { diff --git a/drivers/block/ps3vram.c b/drivers/block/ps3vram.c index 1088798c8dd0..b71d28372ef3 100644 --- a/drivers/block/ps3vram.c +++ b/drivers/block/ps3vram.c @@ -797,7 +797,7 @@ static int ps3vram_probe(struct ps3_system_bus_device *dev) return error; }
-static int ps3vram_remove(struct ps3_system_bus_device *dev) +static void ps3vram_remove(struct ps3_system_bus_device *dev) { struct ps3vram_priv *priv = ps3_system_bus_get_drvdata(dev);
@@ -817,7 +817,6 @@ static int ps3vram_remove(struct ps3_system_bus_device *dev) free_pages((unsigned long) priv->xdr_buf, get_order(XDR_BUF_SIZE)); kfree(priv); ps3_system_bus_set_drvdata(dev, NULL);
- return 0;
}
static struct ps3_system_bus_driver ps3vram = { diff --git a/drivers/char/ps3flash.c b/drivers/char/ps3flash.c index 1a07fee33f66..23871cde41fb 100644 --- a/drivers/char/ps3flash.c +++ b/drivers/char/ps3flash.c @@ -403,7 +403,7 @@ static int ps3flash_probe(struct ps3_system_bus_device *_dev) return error; }
-static int ps3flash_remove(struct ps3_system_bus_device *_dev) +static void ps3flash_remove(struct ps3_system_bus_device *_dev) { struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
@@ -413,7 +413,6 @@ static int ps3flash_remove(struct ps3_system_bus_device *_dev) kfree(ps3_system_bus_get_drvdata(&dev->sbd)); ps3_system_bus_set_drvdata(&dev->sbd, NULL); ps3flash_dev = NULL;
- return 0;
}
diff --git a/drivers/net/ethernet/toshiba/ps3_gelic_net.c b/drivers/net/ethernet/toshiba/ps3_gelic_net.c index d9a5722f561b..3d1fc8d2ca66 100644 --- a/drivers/net/ethernet/toshiba/ps3_gelic_net.c +++ b/drivers/net/ethernet/toshiba/ps3_gelic_net.c @@ -1791,7 +1791,7 @@ static int ps3_gelic_driver_probe(struct ps3_system_bus_device *dev)
- ps3_gelic_driver_remove - remove a device from the control of this driver
*/
-static int ps3_gelic_driver_remove(struct ps3_system_bus_device *dev) +static void ps3_gelic_driver_remove(struct ps3_system_bus_device *dev) { struct gelic_card *card = ps3_system_bus_get_drvdata(dev); struct net_device *netdev0; @@ -1840,7 +1840,6 @@ static int ps3_gelic_driver_remove(struct ps3_system_bus_device *dev) ps3_close_hv_device(dev);
pr_debug("%s: done\n", __func__);
- return 0;
}
static struct ps3_system_bus_driver ps3_gelic_driver = { diff --git a/drivers/ps3/ps3-lpm.c b/drivers/ps3/ps3-lpm.c index e54aa2d82f50..65512b6cc6fd 100644 --- a/drivers/ps3/ps3-lpm.c +++ b/drivers/ps3/ps3-lpm.c @@ -1196,7 +1196,7 @@ static int ps3_lpm_probe(struct ps3_system_bus_device *dev) return 0; }
-static int ps3_lpm_remove(struct ps3_system_bus_device *dev) +static void ps3_lpm_remove(struct ps3_system_bus_device *dev) { dev_dbg(&dev->core, " -> %s:%u:\n", __func__, __LINE__);
@@ -1206,7 +1206,6 @@ static int ps3_lpm_remove(struct ps3_system_bus_device *dev) lpm_priv = NULL;
dev_info(&dev->core, " <- %s:%u:\n", __func__, __LINE__);
- return 0;
}
static struct ps3_system_bus_driver ps3_lpm_driver = { diff --git a/drivers/ps3/ps3-vuart.c b/drivers/ps3/ps3-vuart.c index 4ed131eaff51..e34ae6a442c7 100644 --- a/drivers/ps3/ps3-vuart.c +++ b/drivers/ps3/ps3-vuart.c @@ -1102,7 +1102,7 @@ static int ps3_vuart_cleanup(struct ps3_system_bus_device *dev)
- device can no longer be used.
*/
-static int ps3_vuart_remove(struct ps3_system_bus_device *dev) +static void ps3_vuart_remove(struct ps3_system_bus_device *dev) { struct ps3_vuart_port_priv *priv = to_port_priv(dev); struct ps3_vuart_port_driver *drv; @@ -1118,7 +1118,7 @@ static int ps3_vuart_remove(struct ps3_system_bus_device *dev) dev_dbg(&dev->core, "%s:%d: no driver bound\n", __func__, __LINE__); mutex_unlock(&vuart_bus_priv.probe_mutex);
return 0;
return;}
drv = ps3_system_bus_dev_to_vuart_drv(dev);
@@ -1141,7 +1141,6 @@ static int ps3_vuart_remove(struct ps3_system_bus_device *dev)
dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__); mutex_unlock(&vuart_bus_priv.probe_mutex);
- return 0;
}
/** @@ -1154,7 +1153,7 @@ static int ps3_vuart_remove(struct ps3_system_bus_device *dev)
- sequence.
*/
-static int ps3_vuart_shutdown(struct ps3_system_bus_device *dev) +static void ps3_vuart_shutdown(struct ps3_system_bus_device *dev) { struct ps3_vuart_port_driver *drv;
@@ -1169,7 +1168,7 @@ static int ps3_vuart_shutdown(struct ps3_system_bus_device *dev) dev_dbg(&dev->core, "%s:%d: no driver bound\n", __func__, __LINE__); mutex_unlock(&vuart_bus_priv.probe_mutex);
return 0;
return;}
drv = ps3_system_bus_dev_to_vuart_drv(dev);
@@ -1193,7 +1192,6 @@ static int ps3_vuart_shutdown(struct ps3_system_bus_device *dev) dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__);
mutex_unlock(&vuart_bus_priv.probe_mutex);
- return 0;
}
static int __init ps3_vuart_bus_init(void) diff --git a/drivers/scsi/ps3rom.c b/drivers/scsi/ps3rom.c index f75c0b5cd587..ccb5771f1cb7 100644 --- a/drivers/scsi/ps3rom.c +++ b/drivers/scsi/ps3rom.c @@ -402,7 +402,7 @@ static int ps3rom_probe(struct ps3_system_bus_device *_dev) return error; }
-static int ps3rom_remove(struct ps3_system_bus_device *_dev) +static void ps3rom_remove(struct ps3_system_bus_device *_dev) { struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core); struct Scsi_Host *host = ps3_system_bus_get_drvdata(&dev->sbd); @@ -412,7 +412,6 @@ static int ps3rom_remove(struct ps3_system_bus_device *_dev) scsi_host_put(host); ps3_system_bus_set_drvdata(&dev->sbd, NULL); kfree(dev->bounce_buf);
- return 0;
}
static struct ps3_system_bus_driver ps3rom = { diff --git a/drivers/usb/host/ehci-ps3.c b/drivers/usb/host/ehci-ps3.c index fb52133c3557..98568b046a1a 100644 --- a/drivers/usb/host/ehci-ps3.c +++ b/drivers/usb/host/ehci-ps3.c @@ -200,7 +200,7 @@ static int ps3_ehci_probe(struct ps3_system_bus_device *dev) return result; }
-static int ps3_ehci_remove(struct ps3_system_bus_device *dev) +static void ps3_ehci_remove(struct ps3_system_bus_device *dev) { unsigned int tmp; struct usb_hcd *hcd = ps3_system_bus_get_drvdata(dev); @@ -227,8 +227,6 @@ static int ps3_ehci_remove(struct ps3_system_bus_device *dev)
ps3_dma_region_free(dev->d_region); ps3_close_hv_device(dev);
- return 0;
}
static int __init ps3_ehci_driver_register(struct ps3_system_bus_driver *drv) diff --git a/drivers/usb/host/ohci-ps3.c b/drivers/usb/host/ohci-ps3.c index f77cd6af0ccf..4f5af929c3e4 100644 --- a/drivers/usb/host/ohci-ps3.c +++ b/drivers/usb/host/ohci-ps3.c @@ -184,7 +184,7 @@ static int ps3_ohci_probe(struct ps3_system_bus_device *dev) return result; }
-static int ps3_ohci_remove(struct ps3_system_bus_device *dev) +static void ps3_ohci_remove(struct ps3_system_bus_device *dev) { unsigned int tmp; struct usb_hcd *hcd = ps3_system_bus_get_drvdata(dev); @@ -212,8 +212,6 @@ static int ps3_ohci_remove(struct ps3_system_bus_device *dev)
ps3_dma_region_free(dev->d_region); ps3_close_hv_device(dev);
- return 0;
}
static int __init ps3_ohci_driver_register(struct ps3_system_bus_driver *drv) diff --git a/drivers/video/fbdev/ps3fb.c b/drivers/video/fbdev/ps3fb.c index 203c254f8f6c..2fe08b67eda7 100644 --- a/drivers/video/fbdev/ps3fb.c +++ b/drivers/video/fbdev/ps3fb.c @@ -1208,7 +1208,7 @@ static int ps3fb_probe(struct ps3_system_bus_device *dev) return retval; }
-static int ps3fb_shutdown(struct ps3_system_bus_device *dev) +static void ps3fb_shutdown(struct ps3_system_bus_device *dev) { struct fb_info *info = ps3_system_bus_get_drvdata(dev); u64 xdr_lpar = ps3_mm_phys_to_lpar(__pa(ps3fb_videomemory.address)); @@ -1241,8 +1241,6 @@ static int ps3fb_shutdown(struct ps3_system_bus_device *dev) lv1_gpu_memory_free(ps3fb.memory_handle); ps3_close_hv_device(dev); dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__);
- return 0;
}
static struct ps3_system_bus_driver ps3fb_driver = { diff --git a/sound/ppc/snd_ps3.c b/sound/ppc/snd_ps3.c index 6ab796a5d936..8e44fa5d4dc7 100644 --- a/sound/ppc/snd_ps3.c +++ b/sound/ppc/snd_ps3.c @@ -1049,7 +1049,7 @@ static int snd_ps3_driver_probe(struct ps3_system_bus_device *dev) }; /* snd_ps3_probe */
/* called when module removal */ -static int snd_ps3_driver_remove(struct ps3_system_bus_device *dev) +static void snd_ps3_driver_remove(struct ps3_system_bus_device *dev) { int ret; pr_info("%s:start id=%d\n", __func__, dev->match_id); @@ -1075,7 +1075,6 @@ static int snd_ps3_driver_remove(struct ps3_system_bus_device *dev) lv1_gpu_device_unmap(2); ps3_close_hv_device(dev); pr_info("%s:end id=%d\n", __func__, dev->match_id);
- return 0;
} /* snd_ps3_remove */
static struct ps3_system_bus_driver snd_ps3_bus_driver_info = {
2.29.2
Hello Michael,
On Sat, Nov 28, 2020 at 09:48:30AM +0100, Takashi Iwai wrote:
On Thu, 26 Nov 2020 17:59:50 +0100, Uwe Kleine-König wrote:
The driver core ignores the return value of struct device_driver::remove because there is only little that can be done. For the shutdown callback it's ps3_system_bus_shutdown() which ignores the return value.
To simplify the quest to make struct device_driver::remove return void, let struct ps3_system_bus_driver::remove return void, too. All users already unconditionally return 0, this commit makes it obvious that returning an error code is a bad idea and ensures future users behave accordingly.
Signed-off-by: Uwe Kleine-König u.kleine-koenig@pengutronix.de
For the sound bit: Acked-by: Takashi Iwai tiwai@suse.de
assuming that you are the one who will apply this patch: Note that it depends on patch 1 that Takashi already applied to his tree. So you either have to wait untils patch 1 appears in some tree that you merge before applying, or you have to take patch 1, too. (With Takashi optinally dropping it then.)
Best regards Uwe
Uwe Kleine-König u.kleine-koenig@pengutronix.de writes:
Hello Michael,
On Sat, Nov 28, 2020 at 09:48:30AM +0100, Takashi Iwai wrote:
On Thu, 26 Nov 2020 17:59:50 +0100, Uwe Kleine-König wrote:
The driver core ignores the return value of struct device_driver::remove because there is only little that can be done. For the shutdown callback it's ps3_system_bus_shutdown() which ignores the return value.
To simplify the quest to make struct device_driver::remove return void, let struct ps3_system_bus_driver::remove return void, too. All users already unconditionally return 0, this commit makes it obvious that returning an error code is a bad idea and ensures future users behave accordingly.
Signed-off-by: Uwe Kleine-König u.kleine-koenig@pengutronix.de
For the sound bit: Acked-by: Takashi Iwai tiwai@suse.de
assuming that you are the one who will apply this patch: Note that it depends on patch 1 that Takashi already applied to his tree. So you either have to wait untils patch 1 appears in some tree that you merge before applying, or you have to take patch 1, too. (With Takashi optinally dropping it then.)
Thanks. I've picked up both patches.
If Takashi doesn't want to rebase his tree to drop patch 1 that's OK, it will just arrive in mainline via two paths, but git should handle it.
cheers
On Wed, 02 Dec 2020 13:14:06 +0100, Michael Ellerman wrote:
Uwe Kleine-König u.kleine-koenig@pengutronix.de writes:
Hello Michael,
On Sat, Nov 28, 2020 at 09:48:30AM +0100, Takashi Iwai wrote:
On Thu, 26 Nov 2020 17:59:50 +0100, Uwe Kleine-König wrote:
The driver core ignores the return value of struct device_driver::remove because there is only little that can be done. For the shutdown callback it's ps3_system_bus_shutdown() which ignores the return value.
To simplify the quest to make struct device_driver::remove return void, let struct ps3_system_bus_driver::remove return void, too. All users already unconditionally return 0, this commit makes it obvious that returning an error code is a bad idea and ensures future users behave accordingly.
Signed-off-by: Uwe Kleine-König u.kleine-koenig@pengutronix.de
For the sound bit: Acked-by: Takashi Iwai tiwai@suse.de
assuming that you are the one who will apply this patch: Note that it depends on patch 1 that Takashi already applied to his tree. So you either have to wait untils patch 1 appears in some tree that you merge before applying, or you have to take patch 1, too. (With Takashi optinally dropping it then.)
Thanks. I've picked up both patches.
If Takashi doesn't want to rebase his tree to drop patch 1 that's OK, it will just arrive in mainline via two paths, but git should handle it.
Yeah, I'd like to avoid rebasing, so let's get it merge from both trees. git can handle such a case gracefully.
thanks,
Takashi
Hi Uwe,
On Thu, Nov 26, 2020 at 6:03 PM Uwe Kleine-König u.kleine-koenig@pengutronix.de wrote:
The remove callback is only called for devices that were probed successfully before. As the matching probe function cannot complete without error if dev->match_id != PS3_MATCH_ID_SOUND, we don't have to check this here.
Signed-off-by: Uwe Kleine-König u.kleine-koenig@pengutronix.de
Thanks for your patch!
Reviewed-by: Geert Uytterhoeven geert@linux-m68k.org
Note that there are similar checks in snd_ps3_driver_probe(), which can be removed, too:
if (WARN_ON(!firmware_has_feature(FW_FEATURE_PS3_LV1))) return -ENODEV; if (WARN_ON(dev->match_id != PS3_MATCH_ID_SOUND)) return -ENODEV;
Gr{oetje,eeting}s,
Geert
On Fri, Nov 27, 2020 at 09:35:39AM +0100, Geert Uytterhoeven wrote:
Hi Uwe,
On Thu, Nov 26, 2020 at 6:03 PM Uwe Kleine-König u.kleine-koenig@pengutronix.de wrote:
The remove callback is only called for devices that were probed successfully before. As the matching probe function cannot complete without error if dev->match_id != PS3_MATCH_ID_SOUND, we don't have to check this here.
Signed-off-by: Uwe Kleine-König u.kleine-koenig@pengutronix.de
Thanks for your patch!
Reviewed-by: Geert Uytterhoeven geert@linux-m68k.org
Note that there are similar checks in snd_ps3_driver_probe(), which can be removed, too:
if (WARN_ON(!firmware_has_feature(FW_FEATURE_PS3_LV1))) return -ENODEV; if (WARN_ON(dev->match_id != PS3_MATCH_ID_SOUND)) return -ENODEV;
I had to invest some brain cycles here. For the first:
Assuming firmware_has_feature(FW_FEATURE_PS3_LV1) always returns the same value, snd_ps3_driver_probe is only used after this check succeeds because the driver is registered only after this check in snd_ps3_init().
The second is superflous because ps3_system_bus_match() yields false if this doesn't match the driver's match_id.
Best regards Uwe
The check for the FW_FEATURE_PS3_LV1 firmware feature is already performed in ps3_system_bus_init() before registering the driver. So if the probe function is actually used, this feature is already known to be available.
The check for the match id is also superfluous; the condition is always true because the bus' match function (ps3_system_bus_match()) only considers this driver for devices having: dev->match_id == snd_ps3_bus_driver_info.match_id.
Suggested-by: Geert Uytterhoeven geert@linux-m68k.org Signed-off-by: Leonard Goehrs l.goehrs@pengutronix.de --- sound/ppc/snd_ps3.c | 5 ----- 1 file changed, 5 deletions(-)
diff --git a/sound/ppc/snd_ps3.c b/sound/ppc/snd_ps3.c index 58bb49fff184..b6e4aa3df870 100644 --- a/sound/ppc/snd_ps3.c +++ b/sound/ppc/snd_ps3.c @@ -896,11 +896,6 @@ static int snd_ps3_driver_probe(struct ps3_system_bus_device *dev) u64 lpar_addr, lpar_size; static u64 dummy_mask;
- if (WARN_ON(!firmware_has_feature(FW_FEATURE_PS3_LV1))) - return -ENODEV; - if (WARN_ON(dev->match_id != PS3_MATCH_ID_SOUND)) - return -ENODEV; - the_card.ps3_dev = dev;
ret = ps3_open_hv_device(dev);
Hallo Leonard,
On Fri, Nov 27, 2020 at 04:22:59PM +0100, Leonard Goehrs wrote:
The check for the FW_FEATURE_PS3_LV1 firmware feature is already performed in ps3_system_bus_init() before registering the driver. So if the probe function is actually used, this feature is already known to be available.
The check for the match id is also superfluous; the condition is always true because the bus' match function (ps3_system_bus_match()) only considers this driver for devices having: dev->match_id == snd_ps3_bus_driver_info.match_id.
Suggested-by: Geert Uytterhoeven geert@linux-m68k.org Signed-off-by: Leonard Goehrs l.goehrs@pengutronix.de
Reviewed-by: Uwe Kleine-König u.kleine-koenig@pengutronix.de
Thanks for picking this up.
Best regards and have a nice week-end, Uwe Kleine-König
On 11/27/20 7:22 AM, Leonard Goehrs wrote:
The check for the FW_FEATURE_PS3_LV1 firmware feature is already performed in ps3_system_bus_init() before registering the driver. So if the probe function is actually used, this feature is already known to be available.
The check for the match id is also superfluous; the condition is always true because the bus' match function (ps3_system_bus_match()) only considers this driver for devices having: dev->match_id == snd_ps3_bus_driver_info.match_id.
Suggested-by: Geert Uytterhoeven geert@linux-m68k.org Signed-off-by: Leonard Goehrs l.goehrs@pengutronix.de
Seems OK with v5.9 on PS3.
Tested by: Geoff Levand geoff@infradead.org
On Fri, 27 Nov 2020 16:22:59 +0100, Leonard Goehrs wrote:
The check for the FW_FEATURE_PS3_LV1 firmware feature is already performed in ps3_system_bus_init() before registering the driver. So if the probe function is actually used, this feature is already known to be available.
The check for the match id is also superfluous; the condition is always true because the bus' match function (ps3_system_bus_match()) only considers this driver for devices having: dev->match_id == snd_ps3_bus_driver_info.match_id.
Suggested-by: Geert Uytterhoeven geert@linux-m68k.org Signed-off-by: Leonard Goehrs l.goehrs@pengutronix.de
Applied now. Thanks.
Takashi
Hi Uwe,
On 11/26/20 8:59 AM, Uwe Kleine-König wrote:
The remove callback is only called for devices that were probed successfully before. As the matching probe function cannot complete without error if dev->match_id != PS3_MATCH_ID_SOUND, we don't have to check this here.
Signed-off-by: Uwe Kleine-König u.kleine-koenig@pengutronix.de
I tested your two patches plus Leonard's patch 'ALSA: ppc: remove redundant checks in PS3 driver probe' applied to v5.9 on the PS3, and they seem to work fine.
Thanks for both your efforts.
Tested by: Geoff Levand geoff@infradead.org
On Thu, 26 Nov 2020 17:59:49 +0100, Uwe Kleine-König wrote:
The remove callback is only called for devices that were probed successfully before. As the matching probe function cannot complete without error if dev->match_id != PS3_MATCH_ID_SOUND, we don't have to check this here.
Signed-off-by: Uwe Kleine-König u.kleine-koenig@pengutronix.de
Applied this one now. Thanks.
Takashi
participants (6)
-
Geert Uytterhoeven -
Geoff Levand -
Leonard Goehrs -
Michael Ellerman -
Takashi Iwai -
Uwe Kleine-König