From: Andrea Parri andrea.parri@amarulasolutions.com
commit 998267900cee901c5d1dfa029a6304d00acbc29f upstream.
smp_mb__before_atomic() can not be applied to atomic_set(). Remove the barrier and rely on RELEASE synchronization.
Fixes: ba16b2846a8c6 ("kernfs: add an API to get kernfs node from inode number") Cc: stable@vger.kernel.org Signed-off-by: Andrea Parri andrea.parri@amarulasolutions.com Acked-by: Tejun Heo tj@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/kernfs/dir.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
--- a/fs/kernfs/dir.c +++ b/fs/kernfs/dir.c @@ -649,11 +649,10 @@ static struct kernfs_node *__kernfs_new_ kn->id.generation = gen;
/* - * set ino first. This barrier is paired with atomic_inc_not_zero in + * set ino first. This RELEASE is paired with atomic_inc_not_zero in * kernfs_find_and_get_node_by_ino */ - smp_mb__before_atomic(); - atomic_set(&kn->count, 1); + atomic_set_release(&kn->count, 1); atomic_set(&kn->active, KN_DEACTIVATED_BIAS); RB_CLEAR_NODE(&kn->rb);