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| author | Chuhong Yuan <hslester96@gmail.com> | 2019-08-06 10:58:46 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-08-08 18:12:17 -0700 |
| commit | 4a8937b83892cb69524291cae6cdabad4a8be033 (patch) | |
| tree | b5a9309221ad0f066bdd08f1539a7fc2ecacd19b | |
| parent | e858ef1cd4bc1bdfcd18114a8195236e336cee42 (diff) | |
| download | linux-4a8937b83892cb69524291cae6cdabad4a8be033.tar.bz2 | |
cxgb4: smt: Add lock for atomic_dec_and_test
The atomic_dec_and_test() is not safe because it is
outside of locks.
Move the locks of t4_smte_free() to its caller,
cxgb4_smt_release() to protect the atomic decrement.
Fixes: 3bdb376e6944 ("cxgb4: introduce SMT ops to prepare for SMAC rewrite support")
Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ethernet/chelsio/cxgb4/smt.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/ethernet/chelsio/cxgb4/smt.c b/drivers/net/ethernet/chelsio/cxgb4/smt.c index eaf1fb74689c..d6e84c8b5554 100644 --- a/drivers/net/ethernet/chelsio/cxgb4/smt.c +++ b/drivers/net/ethernet/chelsio/cxgb4/smt.c @@ -97,11 +97,9 @@ found_reuse: static void t4_smte_free(struct smt_entry *e) { - spin_lock_bh(&e->lock); if (atomic_read(&e->refcnt) == 0) { /* hasn't been recycled */ e->state = SMT_STATE_UNUSED; } - spin_unlock_bh(&e->lock); } /** @@ -111,8 +109,10 @@ static void t4_smte_free(struct smt_entry *e) */ void cxgb4_smt_release(struct smt_entry *e) { + spin_lock_bh(&e->lock); if (atomic_dec_and_test(&e->refcnt)) t4_smte_free(e); + spin_unlock_bh(&e->lock); } EXPORT_SYMBOL(cxgb4_smt_release); |