Commit 635c265f authored by Takashi Iwai's avatar Takashi Iwai
Browse files

ALSA: ctxfi - Replace atc lock to mutex 



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: default avatarTakashi Iwai <tiwai@suse.de>
parent a5990dc5

sound/pci/ctxfi/ctatc.c

+9 −13
Original line number Diff line number Diff line
@@ -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);

sound/pci/ctxfi/ctatc.h

+2 −2
Original line number Diff line number Diff line
@@ -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);

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