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ALSA: usb-audio: Properly refcounting clock rate
[ Upstream commit 9a737e7 ] We fixed the bug introduced by the patch for managing the shared clocks at the commit 809f44a ("ALSA: usb-audio: Clear fixed clock rate at closing EP"), but it was merely a workaround. By this change, the clock reference rate is cleared at each EP close, hence the still remaining EP may need a re-setup of rate unnecessarily. This patch introduces the proper refcounting for the clock reference object so that the clock setup is done only when needed. Fixes: 809f44a ("ALSA: usb-audio: Clear fixed clock rate at closing EP") Fixes: c11117b ("ALSA: usb-audio: Refcount multiple accesses on the single clock") Link: https://lore.kernel.org/r/20220920181126.4912-1-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Sasha Levin <sashal@kernel.org>
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