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ALSA: pcm_dmaengine: Properly synchronize DMA on shutdown
authorLars-Peter Clausen <lars@metafoo.de>
Tue, 20 Oct 2015 09:46:31 +0000 (11:46 +0200)
committerVinod Koul <vinod.koul@intel.com>
Mon, 16 Nov 2015 02:58:52 +0000 (08:28 +0530)
commitbc0e7345168c0f7483d2d1da86285d89136417cd
tree9045e7f4f133da72296fdf13c9270db34d64906atree | snapshot
parent860dd64c4382709a276eb4b7ef36596579dba04acommit | diff
ALSA: pcm_dmaengine: Properly synchronize DMA on shutdown

Use the new dmaengine_synchronize() function to make sure that all complete
callbacks have finished running before the runtime data, which is accessed
in the completed callback, is freed.

This fixes a long standing use-after-free race condition that has been
observed on some systems.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
sound/core/pcm_dmaengine.c diff | blob | history
Domain: System / Kernel;