Takashi Sakamoto 7cc994f27e kselftest: alsa: optimization for SNDRV_CTL_ELEM_ACCESS_VOLATILE ... The volatile attribute of control element means that the hardware can voluntarily change the state of control element independent of any operation by software. ALSA control core necessarily sends notification to userspace subscribers for any change from userspace application, while it doesn't for the hardware's voluntary change. This commit adds optimization for the attribute. Even if read value is different from written value, the test reports success as long as the target control element has the attribute. On the other hand, the difference is itself reported for developers' convenience. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/Ya7TAHdMe9i41bsC@workstation [Fix comment style as suggested by Shuah -- broonie] Reviewed-by: Shuah Khan <skhan@linuxfoundation.org> Signed-off-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20211210185410.740009-3-broonie@kernel.org Signed-off-by: Takashi Iwai <tiwai@suse.de>		2021-12-12 10:04:29 +01:00
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mixer-test.c	kselftest: alsa: optimization for SNDRV_CTL_ELEM_ACCESS_VOLATILE	2021-12-12 10:04:29 +01:00