[PATCH 08/11] dma-buf: Restart reservation_object_wait_timeout_rcu() after writes

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



In order to be completely generic, we have to double check the read
seqlock after acquiring a reference to the fence. If the driver is
allocating fences from a SLAB_DESTROY_BY_RCU, or similar freelist, then
within an RCU grace period a fence may be freed and reallocated. The RCU
read side critical section does not prevent this reallocation, instead
we have to inspect the reservation's seqlock to double check if the
fences have been reassigned as we were acquiring our reference.

Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Cc: Christian König <christian.koenig@xxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
Cc: linux-media@xxxxxxxxxxxxxxx
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: linaro-mm-sig@xxxxxxxxxxxxxxxx
---
 drivers/dma-buf/reservation.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/dma-buf/reservation.c b/drivers/dma-buf/reservation.c
index 10fd441dd4ed..3369e4668e96 100644
--- a/drivers/dma-buf/reservation.c
+++ b/drivers/dma-buf/reservation.c
@@ -388,9 +388,6 @@ retry:
 		if (fobj)
 			shared_count = fobj->shared_count;
 
-		if (read_seqcount_retry(&obj->seq, seq))
-			goto unlock_retry;
-
 		for (i = 0; i < shared_count; ++i) {
 			struct fence *lfence = rcu_dereference(fobj->shared[i]);
 
@@ -413,9 +410,6 @@ retry:
 	if (!shared_count) {
 		struct fence *fence_excl = rcu_dereference(obj->fence_excl);
 
-		if (read_seqcount_retry(&obj->seq, seq))
-			goto unlock_retry;
-
 		if (fence_excl &&
 		    !test_bit(FENCE_FLAG_SIGNALED_BIT, &fence_excl->flags)) {
 			if (!fence_get_rcu(fence_excl))
@@ -430,6 +424,11 @@ retry:
 
 	rcu_read_unlock();
 	if (fence) {
+		if (read_seqcount_retry(&obj->seq, seq)) {
+			fence_put(fence);
+			goto retry;
+		}
+
 		ret = fence_wait_timeout(fence, intr, ret);
 		fence_put(fence);
 		if (ret > 0 && wait_all && (i + 1 < shared_count))
-- 
2.9.3

_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/dri-devel




[Index of Archives]     [Linux DRI Users]     [Linux Intel Graphics]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]
  Powered by Linux