[PATCH v2 19/24] ALSA: seq: virmidi: Use guard() for locking

[Takashi Iwai <tiwai@xxxxxxx>]

We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.

Only the code refactoring, and no functional changes.

Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
---
 sound/core/seq/seq_virmidi.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/sound/core/seq/seq_virmidi.c b/sound/core/seq/seq_virmidi.c
index 35f93b43dd2a..b4672613c261 100644
--- a/sound/core/seq/seq_virmidi.c
+++ b/sound/core/seq/seq_virmidi.c
@@ -199,11 +199,10 @@ static int snd_virmidi_input_open(struct snd_rawmidi_substream *substream)
 	vmidi->client = rdev->client;
 	vmidi->port = rdev->port;	
 	runtime->private_data = vmidi;
-	down_write(&rdev->filelist_sem);
-	write_lock_irq(&rdev->filelist_lock);
-	list_add_tail(&vmidi->list, &rdev->filelist);
-	write_unlock_irq(&rdev->filelist_lock);
-	up_write(&rdev->filelist_sem);
+	scoped_guard(rwsem_write, &rdev->filelist_sem) {
+		guard(write_lock_irq)(&rdev->filelist_lock);
+		list_add_tail(&vmidi->list, &rdev->filelist);
+	}
 	vmidi->rdev = rdev;
 	return 0;
 }
@@ -243,11 +242,10 @@ static int snd_virmidi_input_close(struct snd_rawmidi_substream *substream)
 	struct snd_virmidi_dev *rdev = substream->rmidi->private_data;
 	struct snd_virmidi *vmidi = substream->runtime->private_data;
 
-	down_write(&rdev->filelist_sem);
-	write_lock_irq(&rdev->filelist_lock);
-	list_del(&vmidi->list);
-	write_unlock_irq(&rdev->filelist_lock);
-	up_write(&rdev->filelist_sem);
+	scoped_guard(rwsem_write, &rdev->filelist_sem) {
+		guard(write_lock_irq)(&rdev->filelist_lock);
+		list_del(&vmidi->list);
+	}
 	snd_midi_event_free(vmidi->parser);
 	substream->runtime->private_data = NULL;
 	kfree(vmidi);
-- 
2.35.3