From d215f63d49da9a8803af3e81acd6cad743686573 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Wed, 29 Sep 2021 10:08:41 +0200 Subject: 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 --- sound/usb/endpoint.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'sound/usb/endpoint.h') 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 */ -- cgit v1.2.3