diff options
| author | Arnd Bergmann <arnd@arndb.de> | 2014-01-02 13:07:50 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2014-01-14 16:12:07 +0100 |
| commit | 1a1e0a80ceb766852e8abd5d4c3d9475611a7d85 (patch) | |
| tree | 0efe9224215eca736bbf6a06538651eb54b9516f | |
| parent | 76439c2ac686c547ca2f53bfe964c100e697ff4a (diff) | |
sound: oss: dmasound: kill SLEEP() macro to avoid race
The use of interruptible_sleep_on_timeout in the dmasound driver
is questionable and we want to kill off all sleep_on variants.
This replaces the calls with wait_event_interruptible_timeout
where possible, to wait for a particular event instead of blocking
in a racy way. In the sq_write function, the easiest solution is
an open-coded prepare_to_wait loop.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
| -rw-r--r-- | sound/oss/dmasound/dmasound.h | 1 | ||||
| -rw-r--r-- | sound/oss/dmasound/dmasound_core.c | 28 |
2 files changed, 19 insertions, 10 deletions
diff --git a/sound/oss/dmasound/dmasound.h b/sound/oss/dmasound/dmasound.h index 1308d8d34186..01019f06fa91 100644 --- a/sound/oss/dmasound/dmasound.h +++ b/sound/oss/dmasound/dmasound.h @@ -239,7 +239,6 @@ struct sound_queue { int busy, syncing, xruns, died; }; -#define SLEEP(queue) interruptible_sleep_on_timeout(&queue, HZ) #define WAKE_UP(queue) (wake_up_interruptible(&queue)) extern struct sound_queue dmasound_write_sq; diff --git a/sound/oss/dmasound/dmasound_core.c b/sound/oss/dmasound/dmasound_core.c index bac43b5b6e95..f4ee85a4c42f 100644 --- a/sound/oss/dmasound/dmasound_core.c +++ b/sound/oss/dmasound/dmasound_core.c @@ -619,15 +619,27 @@ static ssize_t sq_write(struct file *file, const char __user *src, size_t uLeft, } while (uLeft) { + DEFINE_WAIT(wait); + while (write_sq.count >= write_sq.max_active) { + prepare_to_wait(&write_sq.action_queue, &wait, TASK_INTERRUPTIBLE); sq_play(); - if (write_sq.non_blocking) + if (write_sq.non_blocking) { + finish_wait(&write_sq.action_queue, &wait); return uWritten > 0 ? uWritten : -EAGAIN; - SLEEP(write_sq.action_queue); - if (signal_pending(current)) + } + if (write_sq.count < write_sq.max_active) + break; + + schedule_timeout(HZ); + if (signal_pending(current)) { + finish_wait(&write_sq.action_queue, &wait); return uWritten > 0 ? uWritten : -EINTR; + } } + finish_wait(&write_sq.action_queue, &wait); + /* Here, we can avoid disabling the interrupt by first * copying and translating the data, and then updating * the write_sq variables. Until this is done, the interrupt @@ -707,11 +719,8 @@ static int sq_open2(struct sound_queue *sq, struct file *file, fmode_t mode, if (file->f_flags & O_NONBLOCK) return rc; rc = -EINTR; - while (sq->busy) { - SLEEP(sq->open_queue); - if (signal_pending(current)) - return rc; - } + if (wait_event_interruptible(sq->open_queue, !sq->busy)) + return rc; rc = 0; #else /* OSS manual says we will return EBUSY regardless @@ -844,7 +853,8 @@ static int sq_fsync(void) sq_play(); /* there may be an incomplete frame waiting */ while (write_sq.active) { - SLEEP(write_sq.sync_queue); + wait_event_interruptible_timeout(write_sq.sync_queue, + !write_sq.active, HZ); if (signal_pending(current)) { /* While waiting for audio output to drain, an * interrupt occurred. Stop audio output immediately |