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ALSA: pcm: fix blocking while loop in snd_pcm_update_hw_ptr0()

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When period interrupts are disabled, while loop in snd_pcm_update_hw_ptr0()
results in the machine locking up if runtime->hw_ptr_buffer_jiffies is 0.

Validate runtime->hw_ptr_buffer_jiffies value before while loop to avoid
delta check.

CRs-Fixed: 1109229
Change-Id: Ib20b71c70aa4a8bee2837d1f3b5a91ad4ce083da
Signed-off-by: Preetam Singh Ranawat <apranawat@codeaurora.org>
This commit is contained in:
Preetam Singh Ranawat 2017-01-17 16:24:40 +05:30 • committed by Meng Wang
commit 15555d3e6f
1 changed files with 5 additions and 0 deletions
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5
sound/core/pcm_lib.c
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@ -341,7 +341,12 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
* the elapsed time to detect xruns.
*/
jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
#ifdef CONFIG_AUDIO_QGKI
if ((jdelta < runtime->hw_ptr_buffer_jiffies / 2) ||
(runtime->hw_ptr_buffer_jiffies <= 0))
#else
if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
#endif
goto no_delta_check;
hdelta = jdelta - delta * HZ / runtime->rate;
xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;