tree 77f671b4cfc9b6b40b324b0fd3a5e018c202065f
parent 1d5cfca286178ce81fb0c8a5f5777ef123cd69e4
author Takashi Iwai <tiwai@suse.de> 1621181875 +0200
committer Takashi Iwai <tiwai@suse.de> 1621181875 +0200

ALSA: intel8x0: Don't update period unless prepared

The interrupt handler of intel8x0 calls snd_intel8x0_update() whenever
the hardware sets the corresponding status bit for each stream.  This
works fine for most cases as long as the hardware behaves properly.
But when the hardware gives a wrong bit set, this leads to a zero-
division Oops, and reportedly, this seems what happened on a VM.

For fixing the crash, this patch adds a internal flag indicating that
the stream is ready to be updated, and check it (as well as the flag
being in suspended) to ignore such spurious update.

Cc: <stable@vger.kernel.org>
Reported-and-tested-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Link: https://lore.kernel.org/r/s5h5yzi7uh0.wl-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>