ALSA: AACI: fix multiple IRQ claiming
Claiming the IRQ each time a playback or capture interface is opened
is wasteful; the second copy of the registered handler is identical to
the first and just wastes resources. Track the number of opens and
only register the handler when necessary.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/sound/arm/aaci.h b/sound/arm/aaci.h
index 6a4a2ee..04c4568 100644
--- a/sound/arm/aaci.h
+++ b/sound/arm/aaci.h
@@ -226,6 +226,8 @@
struct snd_card *card;
void __iomem *base;
unsigned int fifosize;
+ unsigned int users;
+ struct mutex irq_lock;
/* AC'97 */
struct mutex ac97_sem;