From: Andrea Parri <andrea.parri@xxxxxxxxxxxxxxxxxxxx>
commit f381c6a4bd0ae0fde2d6340f1b9bb0f58d915de6 upstream.
This barrier only applies to the read-modify-write operations; in
particular, it does not apply to the atomic_set() primitive.
Replace the barrier with an smp_mb().
Fixes: dac56212e8127 ("bio: skip atomic inc/dec of ->bi_cnt for most use cases")
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxx>
Reported-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Signed-off-by: Andrea Parri <andrea.parri@xxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Ming Lei <ming.lei@xxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: Ming Lei <ming.lei@xxxxxxxxxx>
Cc: linux-block@xxxxxxxxxxxxxxx
Cc: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
include/linux/bio.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -260,7 +260,7 @@ static inline void bio_cnt_set(struct bi
{
if (count != 1) {
bio->bi_flags |= (1 << BIO_REFFED);
- smp_mb__before_atomic();
+ smp_mb();
}
atomic_set(&bio->__bi_cnt, count);
}
