4.0-stable review patch. If anyone has any objections, please let me know.
------------------
From: Oded Gabbay <oded.gabbay@xxxxxxx>
commit 1bf1b431d98d7e5b5419876d4c219469e60693e1 upstream.
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@xxxxxxx>
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/iommu/amd_iommu_v2.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/iommu/amd_iommu_v2.c
+++ b/drivers/iommu/amd_iommu_v2.c
@@ -266,6 +266,7 @@ static void put_pasid_state(struct pasid
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);
}
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