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Date: Sat, 18 Mar 2023 19:59:28 +0900 From: Takashi Sakamoto <o-takashi@...amocchi.jp> To: John Keeping <john@...anate.com>, Takashi Iwai <tiwai@...e.com>, "moderated list:SOUND" <alsa-devel@...a-project.org>, open list <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] ALSA: usb-audio: Fix recursive locking on XRUN On Sat, Mar 18, 2023 at 09:20:05AM +0900, Takashi Sakamoto wrote: > 1. Failure at tasklet for URB completion > > It is softIRQ context. The stream lock is not acquired. It doesn't > matter to call current XRUN API. > > 2. Failure at PCM operation called by ALSA PCM application > > It is process context. The stream lock is acquired before calling driver > code. When detecting any type of failure, driver code stores the state. > Then .pointer callback should return SNDRV_PCM_IOCTL_HWSYNC refering to > the state. Oops. I did copy-and-paste mistake here... It should be SNDRV_PCM_POS_XRUN instead of SNDRV_PCM_IOCTL_HWSYNC... Regards Takashi Sakamoto
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