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ALSA: docs: Add description about ack callback -EPIPE error handling 

Add a brief description about the newly added behavior of the PCM ack
callback with -EPIPE error.

Link: https://lore.kernel.org/r/20230323065237.5062-3-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2023-03-23 07:52:36 +01:00
parent 0146878cf2
commit f84af109f6
1 changed files with 4 additions and 0 deletions
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4
Documentation/sound/kernel-api/writing-an-alsa-driver.rst
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@ -2137,6 +2137,10 @@ This callback is also not mandatory. This callback is called when the
emu10k1-fx and cs46xx need to track the current ``appl_ptr`` for the emu10k1-fx and cs46xx need to track the current ``appl_ptr`` for the
internal buffer, and this callback is useful only for such a purpose. internal buffer, and this callback is useful only for such a purpose.
The callback function may return 0 or a negative error. When the
return value is ``-EPIPE``, PCM core treats as a buffer XRUN happens,
and changes the state to ``SNDRV_PCM_STATE_XRUN`` automatically.
This callback is atomic as default. This callback is atomic as default.
page callback page callback