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authorTakashi Iwai <tiwai@suse.de>2011-09-16 02:29:04 -0400
committerTakashi Iwai <tiwai@suse.de>2011-09-16 02:29:04 -0400
commit0308110615acb4b6409fe042caf22bb9fb075d85 (patch)
treed129f11ebdbe49b21246a72e6ba52c50e81e8e7e /sound/core
parentc731bc96ad641a5fa3d50a87b474652505507282 (diff)
parent763437a9e7737535b2fc72175ad4974048769be6 (diff)
Merge branch 'fix/misc' into topic/misc
Diffstat (limited to 'sound/core')
-rw-r--r--sound/core/pcm_lib.c33
1 files changed, 24 insertions, 9 deletions
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 86d0caf91b35..62e90b862a0d 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -1761,6 +1761,10 @@ static int wait_for_avail(struct snd_pcm_substream *substream,
1761 snd_pcm_uframes_t avail = 0; 1761 snd_pcm_uframes_t avail = 0;
1762 long wait_time, tout; 1762 long wait_time, tout;
1763 1763
1764 init_waitqueue_entry(&wait, current);
1765 set_current_state(TASK_INTERRUPTIBLE);
1766 add_wait_queue(&runtime->tsleep, &wait);
1767
1764 if (runtime->no_period_wakeup) 1768 if (runtime->no_period_wakeup)
1765 wait_time = MAX_SCHEDULE_TIMEOUT; 1769 wait_time = MAX_SCHEDULE_TIMEOUT;
1766 else { 1770 else {
@@ -1771,16 +1775,32 @@ static int wait_for_avail(struct snd_pcm_substream *substream,
1771 } 1775 }
1772 wait_time = msecs_to_jiffies(wait_time * 1000); 1776 wait_time = msecs_to_jiffies(wait_time * 1000);
1773 } 1777 }
1774 init_waitqueue_entry(&wait, current); 1778
1775 add_wait_queue(&runtime->tsleep, &wait);
1776 for (;;) { 1779 for (;;) {
1777 if (signal_pending(current)) { 1780 if (signal_pending(current)) {
1778 err = -ERESTARTSYS; 1781 err = -ERESTARTSYS;
1779 break; 1782 break;
1780 } 1783 }
1784
1785 /*
1786 * We need to check if space became available already
1787 * (and thus the wakeup happened already) first to close
1788 * the race of space already having become available.
1789 * This check must happen after been added to the waitqueue
1790 * and having current state be INTERRUPTIBLE.
1791 */
1792 if (is_playback)
1793 avail = snd_pcm_playback_avail(runtime);
1794 else
1795 avail = snd_pcm_capture_avail(runtime);
1796 if (avail >= runtime->twake)
1797 break;
1781 snd_pcm_stream_unlock_irq(substream); 1798 snd_pcm_stream_unlock_irq(substream);
1782 tout = schedule_timeout_interruptible(wait_time); 1799
1800 tout = schedule_timeout(wait_time);
1801
1783 snd_pcm_stream_lock_irq(substream); 1802 snd_pcm_stream_lock_irq(substream);
1803 set_current_state(TASK_INTERRUPTIBLE);
1784 switch (runtime->status->state) { 1804 switch (runtime->status->state) {
1785 case SNDRV_PCM_STATE_SUSPENDED: 1805 case SNDRV_PCM_STATE_SUSPENDED:
1786 err = -ESTRPIPE; 1806 err = -ESTRPIPE;
@@ -1806,14 +1826,9 @@ static int wait_for_avail(struct snd_pcm_substream *substream,
1806 err = -EIO; 1826 err = -EIO;
1807 break; 1827 break;
1808 } 1828 }
1809 if (is_playback)
1810 avail = snd_pcm_playback_avail(runtime);
1811 else
1812 avail = snd_pcm_capture_avail(runtime);
1813 if (avail >= runtime->twake)
1814 break;
1815 } 1829 }
1816 _endloop: 1830 _endloop:
1831 set_current_state(TASK_RUNNING);
1817 remove_wait_queue(&runtime->tsleep, &wait); 1832 remove_wait_queue(&runtime->tsleep, &wait);
1818 *availp = avail; 1833 *availp = avail;
1819 return err; 1834 return err;