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iommu/amd: Fix bug in put_pasid_state_wait
authorOded Gabbay <oded.gabbay@amd.com>
Thu, 16 Apr 2015 14:08:44 +0000 (17:08 +0300)
committerJoerg Roedel <jroedel@suse.de>
Mon, 4 May 2015 11:20:22 +0000 (13:20 +0200)
commit1bf1b431d98d7e5b5419876d4c219469e60693e1
treeb1a9f44753f394ec88f65c32687f46e6f699ec46tree | snapshot
parent5ebe6afaf0057ac3eaeb98defd5456894b446d22commit | diff
iommu/amd: Fix bug in put_pasid_state_wait

This patch fixes a bug in put_pasid_state_wait that appeared in kernel 4.0
The bug is that pasid_state->count wasn't decremented before entering the
wait_event. Thus, the condition in wait_event will never be true.

The fix is to decrement (atomically) the pasid_state->count before the
wait_event.

Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>
Cc: stable@vger.kernel.org #v4.0
Signed-off-by: Joerg Roedel <jroedel@suse.de>
drivers/iommu/amd_iommu_v2.c diff | blob | history
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