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| author | Takashi Iwai <tiwai@suse.de> | 2023-03-23 07:52:36 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2023-03-24 14:52:58 +0100 |
| commit | f84af109f6ca6eba5fd3031cb5b85907a607b2b3 (patch) | |
| tree | a1d4b6a94abbbda511196ba68cfdafe0a2e01f58 /Documentation/sound/kernel-api/writing-an-alsa-driver.rst | |
| parent | ALSA: pcm: Improved XRUN handling for indirect PCM helpers (diff) | |
| download | linux-f84af109f6ca6eba5fd3031cb5b85907a607b2b3.tar.xz linux-f84af109f6ca6eba5fd3031cb5b85907a607b2b3.zip | |
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>
Diffstat (limited to '')
| -rw-r--r-- | Documentation/sound/kernel-api/writing-an-alsa-driver.rst | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/sound/kernel-api/writing-an-alsa-driver.rst b/Documentation/sound/kernel-api/writing-an-alsa-driver.rst index 5c9523b7d55c..6b8f3495407f 100644 --- a/Documentation/sound/kernel-api/writing-an-alsa-driver.rst +++ b/Documentation/sound/kernel-api/writing-an-alsa-driver.rst @@ -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 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. page callback |