[alsa-devel] [PATCH, RFC 27/30] oss: remove last sleep_on users
Arnd Bergmann
arnd at arndb.de
Thu Jan 2 13:07:51 CET 2014
There are three files in oss for which I could not find an easy way to
replace interruptible_sleep_on_timeout with a non-racy version. This
patch instead just adds a private implementation of the function, now
named oss_broken_sleep_on, and changes over the remaining users in
sound/oss/ so we can remove the global interface.
Signed-off-by: Arnd Bergmann <arnd at arndb.de>
Cc: Jaroslav Kysela <perex at perex.cz>
Cc: Takashi Iwai <tiwai at suse.de>
Cc: alsa-devel at alsa-project.org
---
sound/oss/dmabuf.c | 14 ++++++--------
sound/oss/sequencer.c | 16 +++++++---------
sound/oss/sleep.h | 18 ++++++++++++++++++
sound/oss/swarm_cs4297a.c | 14 ++++++++------
4 files changed, 39 insertions(+), 23 deletions(-)
create mode 100644 sound/oss/sleep.h
diff --git a/sound/oss/dmabuf.c b/sound/oss/dmabuf.c
index 461d94c..e3f2913 100644
--- a/sound/oss/dmabuf.c
+++ b/sound/oss/dmabuf.c
@@ -28,6 +28,7 @@
#include <linux/mm.h>
#include <linux/gfp.h>
#include "sound_config.h"
+#include "sleep.h"
#define DMAP_FREE_ON_CLOSE 0
#define DMAP_KEEP_ON_CLOSE 1
@@ -351,8 +352,7 @@ static void dma_reset_output(int dev)
if (!signal_pending(current) && adev->dmap_out->qlen &&
adev->dmap_out->underrun_count == 0){
spin_unlock_irqrestore(&dmap->lock,flags);
- interruptible_sleep_on_timeout(&adev->out_sleeper,
- dmabuf_timeout(dmap));
+ oss_broken_sleep_on(&adev->out_sleeper, dmabuf_timeout(dmap));
spin_lock_irqsave(&dmap->lock,flags);
}
adev->dmap_out->flags &= ~(DMA_SYNCING | DMA_ACTIVE);
@@ -446,7 +446,7 @@ int DMAbuf_sync(int dev)
long t = dmabuf_timeout(dmap);
spin_unlock_irqrestore(&dmap->lock,flags);
/* FIXME: not safe may miss events */
- t = interruptible_sleep_on_timeout(&adev->out_sleeper, t);
+ t = oss_broken_sleep_on(&adev->out_sleeper, t);
spin_lock_irqsave(&dmap->lock,flags);
if (!t) {
adev->dmap_out->flags &= ~DMA_SYNCING;
@@ -466,7 +466,7 @@ int DMAbuf_sync(int dev)
while (!signal_pending(current) &&
adev->d->local_qlen(dev)){
spin_unlock_irqrestore(&dmap->lock,flags);
- interruptible_sleep_on_timeout(&adev->out_sleeper,
+ oss_broken_sleep_on(&adev->out_sleeper,
dmabuf_timeout(dmap));
spin_lock_irqsave(&dmap->lock,flags);
}
@@ -587,8 +587,7 @@ int DMAbuf_getrdbuffer(int dev, char **buf, int *len, int dontblock)
timeout = dmabuf_timeout(dmap);
spin_unlock_irqrestore(&dmap->lock,flags);
- timeout = interruptible_sleep_on_timeout(&adev->in_sleeper,
- timeout);
+ timeout = oss_broken_sleep_on(&adev->in_sleeper, timeout);
if (!timeout) {
/* FIXME: include device name */
err = -EIO;
@@ -768,8 +767,7 @@ static int output_sleep(int dev, int dontblock)
timeout_value = dmabuf_timeout(dmap);
else
timeout_value = MAX_SCHEDULE_TIMEOUT;
- timeout_value = interruptible_sleep_on_timeout(&adev->out_sleeper,
- timeout_value);
+ timeout_value = oss_broken_sleep_on(&adev->out_sleeper, timeout_value);
if (timeout != MAX_SCHEDULE_TIMEOUT && !timeout_value) {
printk(KERN_WARNING "Sound: DMA (output) timed out - IRQ/DRQ config error?\n");
dma_reset_output(dev);
diff --git a/sound/oss/sequencer.c b/sound/oss/sequencer.c
index 4ff60a6..c855a75 100644
--- a/sound/oss/sequencer.c
+++ b/sound/oss/sequencer.c
@@ -19,6 +19,7 @@
#include "sound_config.h"
#include "midi_ctrl.h"
+#include "sleep.h"
static int sequencer_ok;
static struct sound_timer_operations *tmr;
@@ -100,8 +101,7 @@ int sequencer_read(int dev, struct file *file, char __user *buf, int count)
return -EAGAIN;
}
- interruptible_sleep_on_timeout(&midi_sleeper,
- pre_event_timeout);
+ oss_broken_sleep_on(&midi_sleeper, pre_event_timeout);
spin_lock_irqsave(&lock,flags);
if (!iqlen)
{
@@ -343,7 +343,7 @@ static int seq_queue(unsigned char *note, char nonblock)
/*
* Sleep until there is enough space on the queue
*/
- interruptible_sleep_on(&seq_sleeper);
+ oss_broken_sleep_on(&seq_sleeper, MAX_SCHEDULE_TIMEOUT);
}
if (qlen >= SEQ_MAX_QUEUE)
{
@@ -1122,8 +1122,7 @@ static void seq_drain_midi_queues(void)
*/
if (n)
- interruptible_sleep_on_timeout(&seq_sleeper,
- HZ/10);
+ oss_broken_sleep_on(&seq_sleeper, HZ/10);
}
}
@@ -1145,8 +1144,7 @@ void sequencer_release(int dev, struct file *file)
while (!signal_pending(current) && qlen > 0)
{
seq_sync();
- interruptible_sleep_on_timeout(&seq_sleeper,
- 3*HZ);
+ oss_broken_sleep_on(&seq_sleeper, 3*HZ);
/* Extra delay */
}
}
@@ -1201,7 +1199,7 @@ static int seq_sync(void)
seq_startplay();
if (qlen > 0)
- interruptible_sleep_on_timeout(&seq_sleeper, HZ);
+ oss_broken_sleep_on(&seq_sleeper, HZ);
return qlen;
}
@@ -1224,7 +1222,7 @@ static void midi_outc(int dev, unsigned char data)
spin_lock_irqsave(&lock,flags);
while (n && !midi_devs[dev]->outputc(dev, data)) {
- interruptible_sleep_on_timeout(&seq_sleeper, HZ/25);
+ oss_broken_sleep_on(&seq_sleeper, HZ/25);
n--;
}
spin_unlock_irqrestore(&lock,flags);
diff --git a/sound/oss/sleep.h b/sound/oss/sleep.h
new file mode 100644
index 0000000..a20fc92
--- /dev/null
+++ b/sound/oss/sleep.h
@@ -0,0 +1,18 @@
+#include <linux/wait.h>
+
+/*
+ * Do not use. This is a replacement for the old
+ * "interruptible_sleep_on_timeout" function that has been
+ * deprecated for ages. All users should instead try to use
+ * wait_event_interruptible_timeout.
+ */
+
+static inline long
+oss_broken_sleep_on(wait_queue_head_t *q, long timeout)
+{
+ DEFINE_WAIT(wait);
+ prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE);
+ timeout = schedule_timeout(timeout);
+ finish_wait(q, &wait);
+ return timeout;
+}
diff --git a/sound/oss/swarm_cs4297a.c b/sound/oss/swarm_cs4297a.c
index 7d8803a..59defdc 100644
--- a/sound/oss/swarm_cs4297a.c
+++ b/sound/oss/swarm_cs4297a.c
@@ -90,6 +90,8 @@
#include <asm/sibyte/sb1250_mac.h>
#include <asm/sibyte/sb1250.h>
+#include "sleep.h"
+
struct cs4297a_state;
static DEFINE_MUTEX(swarm_cs4297a_mutex);
@@ -748,7 +750,7 @@ static int serdma_reg_access(struct cs4297a_state *s, u64 data)
/* Since a writer has the DSP open, we have to mux the
request in */
s->reg_request = data;
- interruptible_sleep_on(&s->dma_dac.reg_wait);
+ oss_broken_sleep_on(&s->dma_dac.reg_wait, MAX_SCHEDULE_TIMEOUT);
/* XXXKW how can I deal with the starvation case where
the opener isn't writing? */
} else {
@@ -790,7 +792,7 @@ static int cs4297a_read_ac97(struct cs4297a_state *s, u32 offset,
if (serdma_reg_access(s, (0xCLL << 60) | (1LL << 47) | ((u64)(offset & 0x7F) << 40)))
return -1;
- interruptible_sleep_on(&s->dma_adc.reg_wait);
+ oss_broken_sleep_on(&s->dma_adc.reg_wait, MAX_SCHEDULE_TIMEOUT);
*value = s->read_value;
CS_DBGOUT(CS_AC97, 2,
printk(KERN_INFO "cs4297a: rdr reg %x -> %x\n", s->read_reg, s->read_value));
@@ -1740,7 +1742,7 @@ static ssize_t cs4297a_read(struct file *file, char *buffer, size_t count,
start_adc(s);
if (file->f_flags & O_NONBLOCK)
return ret ? ret : -EAGAIN;
- interruptible_sleep_on(&s->dma_adc.wait);
+ oss_broken_sleep_on(&s->dma_adc.wait, MAX_SCHEDULE_TIMEOUT);
if (signal_pending(current))
return ret ? ret : -ERESTARTSYS;
continue;
@@ -1836,7 +1838,7 @@ static ssize_t cs4297a_write(struct file *file, const char *buffer,
start_dac(s);
if (file->f_flags & O_NONBLOCK)
return ret ? ret : -EAGAIN;
- interruptible_sleep_on(&d->wait);
+ oss_broken_sleep_on(&d->wait, MAX_SCHEDULE_TIMEOUT);
if (signal_pending(current))
return ret ? ret : -ERESTARTSYS;
continue;
@@ -2452,7 +2454,7 @@ static int cs4297a_locked_open(struct inode *inode, struct file *file)
return -EBUSY;
}
mutex_unlock(&s->open_sem_dac);
- interruptible_sleep_on(&s->open_wait_dac);
+ oss_broken_sleep_on(&s->open_wait_dac, MAX_SCHEDULE_TIMEOUT);
if (signal_pending(current)) {
printk("open - sig pending\n");
@@ -2469,7 +2471,7 @@ static int cs4297a_locked_open(struct inode *inode, struct file *file)
return -EBUSY;
}
mutex_unlock(&s->open_sem_adc);
- interruptible_sleep_on(&s->open_wait_adc);
+ oss_broken_sleep_on(&s->open_wait_adc, MAX_SCHEDULE_TIMEOUT);
if (signal_pending(current)) {
printk("open - sig pending\n");
--
1.8.3.2
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