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authorEilon Greenstein <eilong@broadcom.com>2009-07-21 05:47:41 +0000
committerDavid S. Miller <davem@davemloft.net>2009-07-21 11:18:29 -0700
commite15107065d073714dc47cf6b80c8bf5eea1bf18b (patch)
tree72bd606ad044b29cf127029b645e5823b978f6a7 /drivers/net/bnx2x_main.c
parent37dbbf32a0d45f0ed88f92cb6d0c35f4809e3a8e (diff)
bnx2x: SMP-safe inter_sem
Signed-off-by: Vlad Zolotarov <vladz@broadcom.com> Signed-off-by: Eilon Greenstein <eilong@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/bnx2x_main.c')
-rw-r--r--drivers/net/bnx2x_main.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/net/bnx2x_main.c b/drivers/net/bnx2x_main.c
index f20df6d7dcb5..18c380330bed 100644
--- a/drivers/net/bnx2x_main.c
+++ b/drivers/net/bnx2x_main.c
@@ -706,6 +706,8 @@ static void bnx2x_int_disable_sync(struct bnx2x *bp, int disable_hw)
/* disable interrupt handling */
atomic_inc(&bp->intr_sem);
+ smp_wmb(); /* Ensure that bp->intr_sem update is SMP-safe */
+
if (disable_hw)
/* prevent the HW from sending interrupts */
bnx2x_int_disable(bp);
@@ -6642,7 +6644,12 @@ static void bnx2x_napi_disable(struct bnx2x *bp)
static void bnx2x_netif_start(struct bnx2x *bp)
{
- if (atomic_dec_and_test(&bp->intr_sem)) {
+ int intr_sem;
+
+ intr_sem = atomic_dec_and_test(&bp->intr_sem);
+ smp_wmb(); /* Ensure that bp->intr_sem update is SMP-safe */
+
+ if (intr_sem) {
if (netif_running(bp->dev)) {
bnx2x_napi_enable(bp);
bnx2x_int_enable(bp);
@@ -8229,6 +8236,7 @@ static int __devinit bnx2x_init_bp(struct bnx2x *bp)
/* Disable interrupt handling until HW is initialized */
atomic_set(&bp->intr_sem, 1);
+ smp_wmb(); /* Ensure that bp->intr_sem update is SMP-safe */
mutex_init(&bp->port.phy_mutex);