At Wed, 7 Aug 2013 15:59:07 +0200, Torsten Schenk wrote:
On Wed, 07 Aug 2013 14:43:43 +0200 Takashi Iwai tiwai@suse.de wrote:
At Tue, 06 Aug 2013 14:53:24 +0300, Jussi Kivilinna wrote:
Patch fixes 6fire not to use stack as URB transfer_buffer. URB buffers need to be DMA-able, which stack is not. Furthermore, transfer_buffer should not be allocated as part of larger device structure because DMA coherency issues and patch fixes this issue too.
Thanks for the information. There is another section where this applies in midi.c/midi.h. I can post a patch later.
Yes, please.
Patch is only compile tested.
The changes look OK, but I'd like to let it checked with a real hardware before putting to stable kernel.
Torsten, could you check this?
The patch works nicely.
OK, I queued the patch to sound git tree now.
I'm just wondering if instead of calling kmalloc() every time it'd be better to put a global sender_buffer and a mutex into the comm_runtime struct and lock it every time a writeX is performed. This also would have the advantage that message blocks would never overlap which currently is possible.
I can prepare a patch on top of this one and send it later, if you agree.
Yes, it'd be much better.
thanks,
Takashi
Thanks, Torsten
thanks,
Takashi
Cc: stable@vger.kernel.org Signed-off-by: Jussi Kivilinna jussi.kivilinna@iki.fi
sound/usb/6fire/comm.c | 38 ++++++++++++++++++++++++++++++++ +----- sound/usb/6fire/comm.h | 2 +- 2 files changed, 34 insertions(+), 6 deletions(-)
diff --git a/sound/usb/6fire/comm.c b/sound/usb/6fire/comm.c index 9e6e3ff..23452ee 100644 --- a/sound/usb/6fire/comm.c +++ b/sound/usb/6fire/comm.c @@ -110,19 +110,37 @@ static int usb6fire_comm_send_buffer(u8 *buffer, struct usb_device *dev) static int usb6fire_comm_write8 (struct comm_runtime *rt, u8 request, u8 reg, u8 value) {
- u8 buffer[13]; /* 13: maximum length of message */
u8 *buffer;
int ret;
/* 13: maximum length of message */
buffer = kmalloc(13, GFP_KERNEL);
if (!buffer)
return -ENOMEM;usb6fire_comm_init_buffer(buffer, 0x00, request, reg,
value, 0x00);
- return usb6fire_comm_send_buffer(buffer, rt->chip->dev);
- ret = usb6fire_comm_send_buffer(buffer, rt->chip->dev);
- kfree(buffer);
- return ret;
}
static int usb6fire_comm_write16(struct comm_runtime *rt, u8 request, u8 reg, u8 vl, u8 vh) {
- u8 buffer[13]; /* 13: maximum length of message */
u8 *buffer;
int ret;
/* 13: maximum length of message */
buffer = kmalloc(13, GFP_KERNEL);
if (!buffer)
return -ENOMEM;usb6fire_comm_init_buffer(buffer, 0x00, request, reg, vl,
vh);
- return usb6fire_comm_send_buffer(buffer, rt->chip->dev);
- ret = usb6fire_comm_send_buffer(buffer, rt->chip->dev);
- kfree(buffer);
- return ret;
}
int usb6fire_comm_init(struct sfire_chip *chip) @@ -135,6 +153,12 @@ int usb6fire_comm_init(struct sfire_chip *chip) if (!rt) return -ENOMEM;
- rt->receiver_buffer = kzalloc(COMM_RECEIVER_BUFSIZE,
GFP_KERNEL);
- if (!rt->receiver_buffer) {
kfree(rt);return -ENOMEM;- }
- urb = &rt->receiver; rt->serial = 1; rt->chip = chip;
@@ -153,6 +177,7 @@ int usb6fire_comm_init(struct sfire_chip *chip) urb->interval = 1; ret = usb_submit_urb(urb, GFP_KERNEL); if (ret < 0) {
kfree(rt->receiver_buffer);data receiver."); return ret; @@ -171,6 +196,9 @@ void usb6fire_comm_abort(struct sfire_chip *chip) void usb6fire_comm_destroy(struct sfire_chip *chip) {
- kfree(chip->comm);
- struct comm_runtime *rt = chip->comm;
- kfree(rt->receiver_buffer);
- kfree(rt); chip->comm = NULL;
} diff --git a/sound/usb/6fire/comm.h b/sound/usb/6fire/comm.h index 6a0840b..780d5ed 100644 --- a/sound/usb/6fire/comm.h +++ b/sound/usb/6fire/comm.h @@ -24,7 +24,7 @@ struct comm_runtime { struct sfire_chip *chip;
struct urb receiver;
- u8 receiver_buffer[COMM_RECEIVER_BUFSIZE];
u8 *receiver_buffer;
u8 serial; /* urb serial */
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