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pcm: direct: Check xrun/suspend before the slave hwptr update

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The xrun/suspend may happen at any time and we should check it right
after the slave hwptr update (but before the actual sync_ptr update in
direct pcm side).  Otherwise the hwptr value may be screwed and get
unexpected large read/write.

Reported-by: S.J. Wang <shengjiu.wang@nxp.com>
Acked-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2022-03-10 09:24:12 +01:00
parent 3577a7a26b
commit bb9f258e19
3 changed files with 13 additions and 9 deletions
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6
src/pcm/pcm_dsnoop.c
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@ -134,14 +134,14 @@ static int snd_pcm_dsnoop_sync_ptr(snd_pcm_t *pcm)
snd_pcm_sframes_t diff;
int err;
err = snd_pcm_direct_check_xrun(dsnoop, pcm);
if (err < 0)
return err;
if (dsnoop->slowptr)
snd_pcm_hwsync(dsnoop->spcm);
old_slave_hw_ptr = dsnoop->slave_hw_ptr;
snoop_timestamp(pcm);
slave_hw_ptr = dsnoop->slave_hw_ptr;
err = snd_pcm_direct_check_xrun(dsnoop, pcm);
if (err < 0)
return err;
diff = pcm_frame_diff(slave_hw_ptr, old_slave_hw_ptr, dsnoop->slave_boundary);
if (diff == 0) /* fast path */
return 0;