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authorTakashi Iwai <tiwai@suse.de>2021-02-06 21:30:51 +0100
committerTakashi Iwai <tiwai@suse.de>2021-02-08 16:00:06 +0100
commit5c2b301476ec493be15546f05e23414e2aa9d472 (patch)
treeb836b5bc2b61a7d0f8e49d8bfebf323615d79393 /fs
parentd6cda4655e2a7612a1e48c49795a5330abc01c5a (diff)
ALSA: usb-audio: More strict state change in EP
The endpoint management has bit flags to indicate the current state, and we're dealing two things: the running bit and the stopping bit. There is a thin window in transition from the running to the stopping in stop_urbs(), and as long as the bit flags are used, it's difficult to plug. This patch modifies the state management code to use the atomic int and follow the explicit three states, STOPPED, RUNNING and STOPPING. The state change is done via atomic_cmpxhg() for avoiding possible races, and check the state change more strictly. The unexpected state change is now handled as an error. Fixes: d0f09d1e4a88 ("ALSA: usb-audio: Refactoring endpoint URB deactivation") Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20210206203052.15606-3-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
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