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| author | Takashi Iwai <tiwai@suse.de> | 2021-09-29 10:08:41 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2021-09-30 13:55:22 +0200 |
| commit | d215f63d49da9a8803af3e81acd6cad743686573 (patch) | |
| tree | bb91dedf94d63f1d82e5f62a44a94396b7233030 /sound/usb/endpoint.h | |
| parent | bceee75387554f682638e719d1ea60125ea78cea (diff) | |
| download | lwn-d215f63d49da9a8803af3e81acd6cad743686573.tar.gz lwn-d215f63d49da9a8803af3e81acd6cad743686573.zip | |
ALSA: usb-audio: Check available frames for the next packet size
This is yet more preparation for the upcoming changes.
Extend snd_usb_endpoint_next_packet_size() to check the available
frames and return -EAGAIN if the next packet size is equal or exceeds
the given size. This will be needed for avoiding XRUN during the low
latency operation.
As of this patch, avail=0 is passed, i.e. the check is skipped and no
behavior change.
Link: https://lore.kernel.org/r/20210929080844.11583-7-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb/endpoint.h')
| -rw-r--r-- | sound/usb/endpoint.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/sound/usb/endpoint.h b/sound/usb/endpoint.h index a1099ec37e1c..1f1a72535a64 100644 --- a/sound/usb/endpoint.h +++ b/sound/usb/endpoint.h @@ -46,6 +46,7 @@ void snd_usb_endpoint_free_all(struct snd_usb_audio *chip); int snd_usb_endpoint_implicit_feedback_sink(struct snd_usb_endpoint *ep); int snd_usb_endpoint_next_packet_size(struct snd_usb_endpoint *ep, - struct snd_urb_ctx *ctx, int idx); + struct snd_urb_ctx *ctx, int idx, + unsigned int avail); #endif /* __USBAUDIO_ENDPOINT_H */ |