tree 687bafab754de6ff5a1857b81fdfe33b77219fb0
parent 92653453c3015c083b9fe0ad48261c6b2267d482
author Clemens Ladisch <clemens@ladisch.de> 1252311534 +0200
committer Takashi Iwai <tiwai@suse.de> 1252318543 +0200

sound: oxygen: work around MCE when changing volume

When the volume is changed continuously (e.g., when the user drags a
volume slider with the mouse), the driver does lots of I2C writes.
Apparently, the sound chip can get confused when we poll the I2C status
register too much, and fails to complete a read from it.  On the PCI-E
models, the PCI-E/PCI bridge gets upset by this and generates a machine
check exception.

To avoid this, this patch replaces the polling with an unconditional
wait that is guaranteed to be long enough.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Tested-by: Johann Messner <johann.messner at jku.at>
Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>