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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>
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a3059b12ad
commit
c5a8895082
2 changed files with 12 additions and 6 deletions
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@ -399,9 +399,11 @@ static int bnx2_unregister_cnic(struct net_device *dev)
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struct bnx2_napi *bnapi = &bp->bnx2_napi[0];
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struct cnic_eth_dev *cp = &bp->cnic_eth_dev;
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mutex_lock(&bp->cnic_lock);
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cp->drv_state = 0;
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bnapi->cnic_present = 0;
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rcu_assign_pointer(bp->cnic_ops, NULL);
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mutex_unlock(&bp->cnic_lock);
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synchronize_rcu();
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return 0;
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}
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@ -429,13 +431,13 @@ bnx2_cnic_stop(struct bnx2 *bp)
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struct cnic_ops *c_ops;
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struct cnic_ctl_info info;
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rcu_read_lock();
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c_ops = rcu_dereference(bp->cnic_ops);
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mutex_lock(&bp->cnic_lock);
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c_ops = bp->cnic_ops;
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if (c_ops) {
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info.cmd = CNIC_CTL_STOP_CMD;
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c_ops->cnic_ctl(bp->cnic_data, &info);
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}
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rcu_read_unlock();
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mutex_unlock(&bp->cnic_lock);
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}
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static void
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@ -444,8 +446,8 @@ bnx2_cnic_start(struct bnx2 *bp)
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struct cnic_ops *c_ops;
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struct cnic_ctl_info info;
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rcu_read_lock();
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c_ops = rcu_dereference(bp->cnic_ops);
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mutex_lock(&bp->cnic_lock);
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c_ops = bp->cnic_ops;
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if (c_ops) {
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if (!(bp->flags & BNX2_FLAG_USING_MSIX)) {
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struct bnx2_napi *bnapi = &bp->bnx2_napi[0];
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@ -455,7 +457,7 @@ bnx2_cnic_start(struct bnx2 *bp)
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info.cmd = CNIC_CTL_START_CMD;
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c_ops->cnic_ctl(bp->cnic_data, &info);
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}
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rcu_read_unlock();
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mutex_unlock(&bp->cnic_lock);
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}
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#else
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@ -7663,6 +7665,9 @@ bnx2_init_board(struct pci_dev *pdev, struct net_device *dev)
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spin_lock_init(&bp->phy_lock);
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spin_lock_init(&bp->indirect_lock);
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#ifdef BCM_CNIC
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mutex_init(&bp->cnic_lock);
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#endif
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INIT_WORK(&bp->reset_task, bnx2_reset_task);
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dev->base_addr = dev->mem_start = pci_resource_start(pdev, 0);
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@ -6902,6 +6902,7 @@ struct bnx2 {
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u32 idle_chk_status_idx;
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#ifdef BCM_CNIC
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struct mutex cnic_lock;
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struct cnic_eth_dev cnic_eth_dev;
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#endif
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