bnx2: Use mutex on slow path cnic calls.

The slow path calls to the cnic driver are sleepable calls so we
cannot use rcu_read_lock().  Use mutex for these slow path calls
instead.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Reviewed-by: Benjamin Li <benli@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c
index b70cc99..06b9011 100644 (file)
--- a/drivers/net/bnx2.c
+++ b/drivers/net/bnx2.c
@@ -399,9 +399,11 @@ static int bnx2_unregister_cnic(struct net_device *dev)
        struct bnx2_napi *bnapi = &bp->bnx2_napi[0];
        struct cnic_eth_dev *cp = &bp->cnic_eth_dev;
 
+       mutex_lock(&bp->cnic_lock);
        cp->drv_state = 0;
        bnapi->cnic_present = 0;
        rcu_assign_pointer(bp->cnic_ops, NULL);
+       mutex_unlock(&bp->cnic_lock);
        synchronize_rcu();
        return 0;
 }
@@ -429,13 +431,13 @@ bnx2_cnic_stop(struct bnx2 *bp)
        struct cnic_ops *c_ops;
        struct cnic_ctl_info info;
 
-       rcu_read_lock();
-       c_ops = rcu_dereference(bp->cnic_ops);
+       mutex_lock(&bp->cnic_lock);
+       c_ops = bp->cnic_ops;
        if (c_ops) {
                info.cmd = CNIC_CTL_STOP_CMD;
                c_ops->cnic_ctl(bp->cnic_data, &info);
        }
-       rcu_read_unlock();
+       mutex_unlock(&bp->cnic_lock);
 }
 
 static void
@@ -444,8 +446,8 @@ bnx2_cnic_start(struct bnx2 *bp)
        struct cnic_ops *c_ops;
        struct cnic_ctl_info info;
 
-       rcu_read_lock();
-       c_ops = rcu_dereference(bp->cnic_ops);
+       mutex_lock(&bp->cnic_lock);
+       c_ops = bp->cnic_ops;
        if (c_ops) {
                if (!(bp->flags & BNX2_FLAG_USING_MSIX)) {
                        struct bnx2_napi *bnapi = &bp->bnx2_napi[0];
@@ -455,7 +457,7 @@ bnx2_cnic_start(struct bnx2 *bp)
                info.cmd = CNIC_CTL_START_CMD;
                c_ops->cnic_ctl(bp->cnic_data, &info);
        }
-       rcu_read_unlock();
+       mutex_unlock(&bp->cnic_lock);
 }
 
 #else
@@ -7663,6 +7665,9 @@ bnx2_init_board(struct pci_dev *pdev, struct net_device *dev)
 
        spin_lock_init(&bp->phy_lock);
        spin_lock_init(&bp->indirect_lock);
+#ifdef BCM_CNIC
+       mutex_init(&bp->cnic_lock);
+#endif
        INIT_WORK(&bp->reset_task, bnx2_reset_task);
 
        dev->base_addr = dev->mem_start = pci_resource_start(pdev, 0);

diff --git a/drivers/net/bnx2.h b/drivers/net/bnx2.h
index f1edfaa..a4f12fd 100644 (file)
--- a/drivers/net/bnx2.h
+++ b/drivers/net/bnx2.h
@@ -6902,6 +6902,7 @@ struct bnx2 {
        u32                     idle_chk_status_idx;
 
 #ifdef BCM_CNIC
+       struct mutex            cnic_lock;
        struct cnic_eth_dev     cnic_eth_dev;
 #endif