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iommu/amd: Fix bug in put_pasid_state_wait

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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>
This commit is contained in:
Oded Gabbay 2015-04-16 17:08:44 +03:00 committed by Joerg Roedel
parent 5ebe6afaf0
commit 1bf1b431d9
1 changed files with 1 additions and 0 deletions
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1
drivers/iommu/amd_iommu_v2.c
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@ -266,6 +266,7 @@ static void put_pasid_state(struct pasid_state *pasid_state)
static void put_pasid_state_wait(struct pasid_state *pasid_state)
{
atomic_dec(&pasid_state->count);
wait_event(pasid_state->wq, !atomic_read(&pasid_state->count));
free_pasid_state(pasid_state);
}