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| author | Mikulas Patocka <mpatocka@redhat.com> | 2022-08-10 09:00:42 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-08-12 10:46:01 +0100 |
| commit | 9f414eb409daf4f778f011cf8266d36896bb930b (patch) | |
| tree | 7cfe718f6051784b6098b114be7f00db6d34dbad /net/rds | |
| parent | 7ebfc85e2cd7b08f518b526173e9a33b56b3913b (diff) | |
| download | linux-9f414eb409daf4f778f011cf8266d36896bb930b.tar.gz linux-9f414eb409daf4f778f011cf8266d36896bb930b.tar.bz2 linux-9f414eb409daf4f778f011cf8266d36896bb930b.zip | |
rds: add missing barrier to release_refill
The functions clear_bit and set_bit do not imply a memory barrier, thus it
may be possible that the waitqueue_active function (which does not take
any locks) is moved before clear_bit and it could miss a wakeup event.
Fix this bug by adding a memory barrier after clear_bit.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rds')
| -rw-r--r-- | net/rds/ib_recv.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/rds/ib_recv.c b/net/rds/ib_recv.c index 6fdedd9dbbc2..cfbf0e129cba 100644 --- a/net/rds/ib_recv.c +++ b/net/rds/ib_recv.c @@ -363,6 +363,7 @@ static int acquire_refill(struct rds_connection *conn) static void release_refill(struct rds_connection *conn) { clear_bit(RDS_RECV_REFILL, &conn->c_flags); + smp_mb__after_atomic(); /* We don't use wait_on_bit()/wake_up_bit() because our waking is in a * hot path and finding waiters is very rare. We don't want to walk |