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ALSA: usb-audio: Use atomic_t for endpoint use_count
The endpoint objects may be started/stopped concurrently by different substreams in the case of implicit feedback mode, while the current code handles the reference counter without any protection. This patch changes the refcount to atomic_t for avoiding the inconsistency. We need no reference_t here as the refcount goes only up to 2. Also the name "use_count" is renamed to "running" since this is about actually the running status, not the open refcount. Tested-by: Keith Milner <[email protected]> Tested-by: Dylan Robinson <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Takashi Iwai <[email protected]>
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