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ALSA: ctxfi - Replace atc lock to mutex

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The spinlock in atc can cause a sleep in lock:

Kernel failure message 1:
BUG: sleeping function called from invalid context at mm/slub.c:1599
in_atomic(): 0, irqs_disabled(): 1, pid: 2537, name: gstreamer-prope
Pid: 2537, comm: gstreamer-prope Tainted: P
2.6.29.4-167.fc11.x86_64 #1
Call Trace:
  [<ffffffff8103ff0f>] __might_sleep+0x10b/0x110
  [<ffffffff810cd734>] __kmalloc+0x73/0x130
  [<ffffffffa0b4b142>] ? daio_rsc_init+0xaa/0x125 [snd_ctxfi]
  [<ffffffffa0b4b212>] dao_rsc_init+0x55/0x1c0 [snd_ctxfi]
  [<ffffffffa0b4b3d2>] dao_rsc_reinit+0x55/0x5d [snd_ctxfi]
  [<ffffffff813abd6c>] ? _spin_lock_irqsave+0x32/0x3b
  [<ffffffffa0b454fe>] atc_spdif_out_passthru+0x92/0x136 [snd_ctxfi]
  ...

Since the lock path is no critical path, it can be gracefully
replaced with a mutex.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2009-06-13 10:12:59 +02:00
parent a5990dc5b9
commit 635c265f32
2 changed files with 11 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
sound/pci/ctxfi/ctatc.c
View File

@ -259,7 +259,6 @@ static int atc_pcm_playback_prepare(struct ct_atc *atc, struct ct_atc_pcm *apcm)
int n_amixer = apcm->substream->runtime->channels, i = 0;
int device = apcm->substream->pcm->device;
unsigned int pitch;
unsigned long flags;
if (NULL != apcm->src) {
/* Prepared pcm playback */
@ -311,10 +310,10 @@ static int atc_pcm_playback_prepare(struct ct_atc *atc, struct ct_atc_pcm *apcm)
src = apcm->src;
for (i = 0; i < n_amixer; i++) {
amixer = apcm->amixers[i];
spin_lock_irqsave(&atc->atc_lock, flags);
mutex_lock(&atc->atc_mutex);
amixer->ops->setup(amixer, &src->rsc,
INIT_VOL, atc->pcm[i+device*2]);
spin_unlock_irqrestore(&atc->atc_lock, flags);
mutex_unlock(&atc->atc_mutex);
src = src->ops->next_interleave(src);
if (NULL == src)
src = apcm->src;
@ -865,7 +864,6 @@ static int
spdif_passthru_playback_setup(struct ct_atc *atc, struct ct_atc_pcm *apcm)
{
struct dao *dao = container_of(atc->daios[SPDIFOO], struct dao, daio);
unsigned long flags;
unsigned int rate = apcm->substream->runtime->rate;
unsigned int status;
int err;
@ -885,7 +883,7 @@ spdif_passthru_playback_setup(struct ct_atc *atc, struct ct_atc_pcm *apcm)
return -ENOENT;
}
spin_lock_irqsave(&atc->atc_lock, flags);
mutex_lock(&atc->atc_mutex);
dao->ops->get_spos(dao, &status);
if (((status >> 24) & IEC958_AES3_CON_FS) != iec958_con_fs) {
status &= ((~IEC958_AES3_CON_FS) << 24);
@ -895,7 +893,7 @@ spdif_passthru_playback_setup(struct ct_atc *atc, struct ct_atc_pcm *apcm)
}
if ((rate != atc->pll_rate) && (32000 != rate))
err = atc_pll_init(atc, rate);
spin_unlock_irqrestore(&atc->atc_lock, flags);
mutex_unlock(&atc->atc_mutex);
return err;
}
@ -908,7 +906,6 @@ spdif_passthru_playback_prepare(struct ct_atc *atc, struct ct_atc_pcm *apcm)
struct dao *dao;
int err;
int i;
unsigned long flags;
if (NULL != apcm->src)
return 0;
@ -934,13 +931,13 @@ spdif_passthru_playback_prepare(struct ct_atc *atc, struct ct_atc_pcm *apcm)
src = apcm->src;
}
/* Connect to SPDIFOO */
spin_lock_irqsave(&atc->atc_lock, flags);
mutex_lock(&atc->atc_mutex);
dao = container_of(atc->daios[SPDIFOO], struct dao, daio);
amixer = apcm->amixers[0];
dao->ops->set_left_input(dao, &amixer->rsc);
amixer = apcm->amixers[1];
dao->ops->set_right_input(dao, &amixer->rsc);
spin_unlock_irqrestore(&atc->atc_lock, flags);
mutex_unlock(&atc->atc_mutex);
ct_timer_prepare(apcm->timer);
@ -1088,7 +1085,6 @@ static int atc_spdif_out_set_status(struct ct_atc *atc, unsigned int status)
static int atc_spdif_out_passthru(struct ct_atc *atc, unsigned char state)
{
unsigned long flags;
struct dao_desc da_dsc = {0};
struct dao *dao;
int err;
@ -1096,7 +1092,7 @@ static int atc_spdif_out_passthru(struct ct_atc *atc, unsigned char state)
struct rsc *rscs[2] = {NULL};
unsigned int spos = 0;
spin_lock_irqsave(&atc->atc_lock, flags);
mutex_lock(&atc->atc_mutex);
dao = container_of(atc->daios[SPDIFOO], struct dao, daio);
da_dsc.msr = state ? 1 : atc->msr;
da_dsc.passthru = state ? 1 : 0;
@ -1114,7 +1110,7 @@ static int atc_spdif_out_passthru(struct ct_atc *atc, unsigned char state)
}
dao->ops->set_spos(dao, spos);
dao->ops->commit_write(dao);
spin_unlock_irqrestore(&atc->atc_lock, flags);
mutex_unlock(&atc->atc_mutex);
return err;
}
@ -1572,7 +1568,7 @@ int __devinit ct_atc_create(struct snd_card *card, struct pci_dev *pci,
atc->msr = msr;
atc->chip_type = chip_type;
spin_lock_init(&atc->atc_lock);
mutex_init(&atc->atc_mutex);
/* Find card model */
err = atc_identify_card(atc);

4
sound/pci/ctxfi/ctatc.h
View File

@ -19,7 +19,7 @@
#define CTATC_H
#include <linux/types.h>
#include <linux/spinlock_types.h>
#include <linux/mutex.h>
#include <linux/pci.h>
#include <linux/timer.h>
#include <sound/core.h>
@ -90,7 +90,7 @@ struct ct_atc {
void (*unmap_audio_buffer)(struct ct_atc *atc, struct ct_atc_pcm *apcm);
unsigned long (*get_ptp_phys)(struct ct_atc *atc, int index);
spinlock_t atc_lock;
struct mutex atc_mutex;
int (*pcm_playback_prepare)(struct ct_atc *atc,
struct ct_atc_pcm *apcm);