[ALSA] sound/core/control.c: hard-irq-safe -> hard-irq-unsafe lock warning

The lock grabbed in snd_ctl_empty_read_queue() is hardirq-unsafe but we hold
an hardirq-safe one already, so make the &ctl->read_lock also hard-irq-safe.

Signed-off-by: Borislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

1 files changed, 3 insertions, 2 deletions

diff --git a/sound/core/control.c b/sound/core/control.c
index 4c3aa8e1037..df0774c76f6 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -93,15 +93,16 @@ static int snd_ctl_open(struct inode *inode, struct file *file)
 
 static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl)
 {
+        unsigned long flags;
         struct snd_kctl_event *cread;
         
-        spin_lock(&ctl->read_lock);
+        spin_lock_irqsave(&ctl->read_lock, flags);
         while (!list_empty(&ctl->events)) {
                 cread = snd_kctl_event(ctl->events.next);
                 list_del(&cread->list);
                 kfree(cread);
         }
-        spin_unlock(&ctl->read_lock);
+        spin_unlock_irqrestore(&ctl->read_lock, flags);
 }
 
 static int snd_ctl_release(struct inode *inode, struct file *file)