[alsa-devel] [PATCH 2/5] ALSA: seq: Align temporary re-locking with irqsave version

[Takashi Iwai]

In a few places in sequencer core, we temporarily unlock / re-lock the
pool spin lock while waiting for the allocation in the blocking mode.
There spin_unlock_irq() / spin_lock_irq() pairs are called while
initially spin_lock_irqsave() is used (and spin_lock_irqrestore() at
the end of the function again).  This is likely OK for now, but it's a
bit confusing and error-prone.

This patch replaces these temporary relocking lines with the irqsave
variant to make the lock/unlock sequence more consistently.

Signed-off-by: Takashi Iwai <tiwai at suse.de>
---
 sound/core/seq/seq_fifo.c   | 4 ++--
 sound/core/seq/seq_memory.c | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/sound/core/seq/seq_fifo.c b/sound/core/seq/seq_fifo.c
index 72c0302a55d2..613ae10d33b8 100644
--- a/sound/core/seq/seq_fifo.c
+++ b/sound/core/seq/seq_fifo.c
@@ -195,9 +195,9 @@ int snd_seq_fifo_cell_out(struct snd_seq_fifo *f,
 		}
 		set_current_state(TASK_INTERRUPTIBLE);
 		add_wait_queue(&f->input_sleep, &wait);
-		spin_unlock_irq(&f->lock);
+		spin_unlock_irqrestore(&f->lock, flags);
 		schedule();
-		spin_lock_irq(&f->lock);
+		spin_lock_irqsave(&f->lock, flags);
 		remove_wait_queue(&f->input_sleep, &wait);
 		if (signal_pending(current)) {
 			spin_unlock_irqrestore(&f->lock, flags);
diff --git a/sound/core/seq/seq_memory.c b/sound/core/seq/seq_memory.c
index 6ea4d8a5a71e..ae0b8971f6ce 100644
--- a/sound/core/seq/seq_memory.c
+++ b/sound/core/seq/seq_memory.c
@@ -244,13 +244,13 @@ static int snd_seq_cell_alloc(struct snd_seq_pool *pool,
 
 		set_current_state(TASK_INTERRUPTIBLE);
 		add_wait_queue(&pool->output_sleep, &wait);
-		spin_unlock_irq(&pool->lock);
+		spin_unlock_irqrestore(&pool->lock, flags);
 		if (mutexp)
 			mutex_unlock(mutexp);
 		schedule();
 		if (mutexp)
 			mutex_lock(mutexp);
-		spin_lock_irq(&pool->lock);
+		spin_lock_irqsave(&pool->lock, flags);
 		remove_wait_queue(&pool->output_sleep, &wait);
 		/* interrupted? */
 		if (signal_pending(current)) {
-- 
2.16.4