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cxgb4: smt: Add lock for atomic_dec_and_test

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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: 3bdb376e69 ("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>
This commit is contained in:
Chuhong Yuan 2019-08-06 10:58:46 +08:00 committed by David S. Miller
parent e858ef1cd4
commit 4a8937b838
1 changed files with 2 additions and 2 deletions
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4
drivers/net/ethernet/chelsio/cxgb4/smt.c
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@ -97,11 +97,9 @@ static struct smt_entry *find_or_alloc_smte(struct smt_data *s, u8 *smac)
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);