From 8dca419721d188bfee5f19fad45275856c619a5c Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Mon, 15 Jun 2009 14:50:52 +0200 Subject: [PATCH] ALSA: ctxfi - Fix deadlock with xfi-timer The PCM x-fi native update routine can cause deadlocks when the trigger(START) is called while the stream is running. This patch fixes the deadlock by just postponing the pcm period update to the next possible wake-up. Also it adds the flip of ti->running flag (just to be sure as now). Signed-off-by: Takashi Iwai --- sound/pci/ctxfi/cttimer.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-) diff --git a/sound/pci/ctxfi/cttimer.c b/sound/pci/ctxfi/cttimer.c index 779c6c3591a..93b0aedc36d 100644 --- a/sound/pci/ctxfi/cttimer.c +++ b/sound/pci/ctxfi/cttimer.c @@ -180,7 +180,7 @@ static inline unsigned int ct_xfitimer_get_wc(struct ct_timer *atimer) * * call this inside the lock and irq disabled */ -static int ct_xfitimer_reprogram(struct ct_timer *atimer) +static int ct_xfitimer_reprogram(struct ct_timer *atimer, int can_update) { struct ct_timer_instance *ti; unsigned int min_intr = (unsigned int)-1; @@ -216,6 +216,8 @@ static int ct_xfitimer_reprogram(struct ct_timer *atimer) ti->frag_count = div_u64((u64)pos * CT_TIMER_FREQ + rate - 1, rate); } + if (ti->need_update && !can_update) + min_intr = 0; /* pending to the next irq */ if (ti->frag_count < min_intr) min_intr = ti->frag_count; } @@ -235,7 +237,7 @@ static void ct_xfitimer_check_period(struct ct_timer *atimer) spin_lock_irqsave(&atimer->list_lock, flags); list_for_each_entry(ti, &atimer->instance_head, instance_list) { - if (ti->need_update) { + if (ti->running && ti->need_update) { ti->need_update = 0; ti->apcm->interrupt(ti->apcm); } @@ -252,7 +254,7 @@ static void ct_xfitimer_callback(struct ct_timer *atimer) spin_lock_irqsave(&atimer->lock, flags); atimer->irq_handling = 1; do { - update = ct_xfitimer_reprogram(atimer); + update = ct_xfitimer_reprogram(atimer, 1); spin_unlock(&atimer->lock); if (update) ct_xfitimer_check_period(atimer); @@ -265,6 +267,7 @@ static void ct_xfitimer_callback(struct ct_timer *atimer) static void ct_xfitimer_prepare(struct ct_timer_instance *ti) { ti->frag_count = ti->substream->runtime->period_size; + ti->running = 0; ti->need_update = 0; } @@ -273,7 +276,6 @@ static void ct_xfitimer_prepare(struct ct_timer_instance *ti) static void ct_xfitimer_update(struct ct_timer *atimer) { unsigned long flags; - int update; spin_lock_irqsave(&atimer->lock, flags); if (atimer->irq_handling) { @@ -284,10 +286,8 @@ static void ct_xfitimer_update(struct ct_timer *atimer) } ct_xfitimer_irq_stop(atimer); - update = ct_xfitimer_reprogram(atimer); + ct_xfitimer_reprogram(atimer, 0); spin_unlock_irqrestore(&atimer->lock, flags); - if (update) - ct_xfitimer_check_period(atimer); } static void ct_xfitimer_start(struct ct_timer_instance *ti) @@ -298,6 +298,8 @@ static void ct_xfitimer_start(struct ct_timer_instance *ti) spin_lock_irqsave(&atimer->lock, flags); if (list_empty(&ti->running_list)) atimer->wc = ct_xfitimer_get_wc(atimer); + ti->running = 1; + ti->need_update = 0; list_add(&ti->running_list, &atimer->running_head); spin_unlock_irqrestore(&atimer->lock, flags); ct_xfitimer_update(atimer); @@ -310,7 +312,7 @@ static void ct_xfitimer_stop(struct ct_timer_instance *ti) spin_lock_irqsave(&atimer->lock, flags); list_del_init(&ti->running_list); - ti->need_update = 0; + ti->running = 0; spin_unlock_irqrestore(&atimer->lock, flags); ct_xfitimer_update(atimer); }