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(parent: 281befa) | patch
ioat: close potential BUG_ON race in the descriptor cleanup path
authorDan Williams <dan.j.williams@intel.com>
Thu, 4 Mar 2010 04:21:10 +0000 (21:21 -0700)
committerDan Williams <dan.j.williams@intel.com>
Thu, 4 Mar 2010 04:21:10 +0000 (21:21 -0700)
commitaa75db0080603bae27961c0502812dfd0f522bb3
tree3e7fbb0ef4415c9f36107a81378f00bba6db9440tree | snapshot (tar.gz zip)
parent281befa5592b0c5f9a3856b5666c62ac66d3d9eecommit | diff
ioat: close potential BUG_ON race in the descriptor cleanup path

Since ioat_cleanup_preamble() and the update of the last completed
descriptor are not synchronized there is a chance that two cleanup threads
can see descriptors to clean.  If the first cleans up all pending
descriptors then the second will trigger the BUG_ON.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
drivers/dma/ioat/dma_v2.c diff | blob | blame | history
drivers/dma/ioat/dma_v3.c diff | blob | blame | history