diff options
| author |   Michael Chan <mchan@broadcom.com> | 2014-06-02 23:08:46 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2014-06-02 23:16:41 -0700 |
| commit | 20f30c2d5ea44925cb83b0fdae78b8600a76b66e (patch) | |
| tree | 6645ecf039b795d6de8579e4c8ab4da22cedb181 /drivers/net/ethernet/broadcom/cnic.c | |
| parent | net: davinci_emac: Remove unwanted debug/error message (diff) | |
| download | wireguard-linux-20f30c2d5ea44925cb83b0fdae78b8600a76b66e.tar.xz wireguard-linux-20f30c2d5ea44925cb83b0fdae78b8600a76b66e.zip | |
cnic: Don't take rcu_read_lock in cnic_rcv_netevent()
Because the called function, such as bnx2fc_indicate_netevent(), can sleep,
we cannot take rcu_lock(). To prevent the rcu protected ulp_ops from going
away, we use the cnic_lock mutex and set the ULP_F_CALL_PENDING flag.
The code already waits for ULP_F_CALL_PENDING flag to clear in
cnic_unregister_device().
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/broadcom/cnic.c')
| -rw-r--r-- | drivers/net/ethernet/broadcom/cnic.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/drivers/net/ethernet/broadcom/cnic.c b/drivers/net/ethernet/broadcom/cnic.c index 09f3fefcbf9c..a0aae722ffcf 100644 --- a/drivers/net/ethernet/broadcom/cnic.c +++ b/drivers/net/ethernet/broadcom/cnic.c @@ -5624,20 +5624,27 @@ static void cnic_rcv_netevent(struct cnic_local *cp, unsigned long event, { int if_type; - rcu_read_lock(); for (if_type = 0; if_type < MAX_CNIC_ULP_TYPE; if_type++) { struct cnic_ulp_ops *ulp_ops; void *ctx; - ulp_ops = rcu_dereference(cp->ulp_ops[if_type]); - if (!ulp_ops || !ulp_ops->indicate_netevent) + mutex_lock(&cnic_lock); + ulp_ops = rcu_dereference_protected(cp->ulp_ops[if_type], + lockdep_is_held(&cnic_lock)); + if (!ulp_ops || !ulp_ops->indicate_netevent) { + mutex_unlock(&cnic_lock); continue; + } ctx = cp->ulp_handle[if_type]; + set_bit(ULP_F_CALL_PENDING, &cp->ulp_flags[if_type]); + mutex_unlock(&cnic_lock); + ulp_ops->indicate_netevent(ctx, event, vlan_id); + + clear_bit(ULP_F_CALL_PENDING, &cp->ulp_flags[if_type]); } - rcu_read_unlock(); } /* netdev event handler */ |