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ALSA: ak411x: Fix stall in work callback

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When ak4114 work calls its callback and the callback invokes
ak4114_reinit(), it stalls due to flush_delayed_work().  For avoiding
this, control the reentrance by introducing a refcount.  Also
flush_delayed_work() is replaced with cancel_delayed_work_sync().

The exactly same bug is present in ak4113.c and fixed as well.

Reported-by: Pavel Hofman <[email protected]>
Acked-by: Jaroslav Kysela <[email protected]>
Tested-by: Pavel Hofman <[email protected]>
Cc: <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
This commit is contained in:
Takashi Iwai 2015-01-13 10:53:20 +01:00
commit 4161b4505f
4 changed files with 18 additions and 21 deletions
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2
include/sound/ak4113.h
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@ -286,7 +286,7 @@ struct ak4113 {
ak4113_write_t *write;
ak4113_read_t *read;
void *private_data;
unsigned int init:1;
atomic_t wq_processing;
spinlock_t lock;
unsigned char regmap[AK4113_WRITABLE_REGS];
struct snd_kcontrol *kctls[AK4113_CONTROLS];

2
include/sound/ak4114.h
View file

@ -168,7 +168,7 @@ struct ak4114 {
ak4114_write_t * write;
ak4114_read_t * read;
void * private_data;
unsigned int init: 1;
atomic_t wq_processing;
spinlock_t lock;
unsigned char regmap[6];
unsigned char txcsb[5];