netdev - [PATCH net-next 2/9] cnic: Prevent "scheduling while atomic" when calling ->cnic

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Date:	Thu, 23 Dec 2010 09:42:57 -0800
From:	"Michael Chan" <mchan@...adcom.com>
To:	davem@...emloft.net
cc:	netdev@...r.kernel.org
Subject: [PATCH net-next 2/9] cnic: Prevent "scheduling while atomic"
 when calling ->cnic_init()

cnic_dev_list is protected by rtnl_lock and cnic_dev_lock spin_lock during
modifications.  When looping on cnic_dev_list and calling ->cnic_init(),
we should just hold rtnl_lock since ->cnic_init() may sleep.

Signed-off-by: Michael Chan <mchan@...adcom.com>
---
 drivers/net/cnic.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/drivers/net/cnic.c b/drivers/net/cnic.c
index 9c2e786..3a7d3ce 100644
--- a/drivers/net/cnic.c
+++ b/drivers/net/cnic.c
@@ -59,6 +59,7 @@ MODULE_DESCRIPTION("Broadcom NetXtreme II CNIC Driver");
 MODULE_LICENSE("GPL");
 MODULE_VERSION(CNIC_MODULE_VERSION);
 
+/* cnic_dev_list modifications are protected by both rtnl and cnic_dev_lock */
 static LIST_HEAD(cnic_dev_list);
 static LIST_HEAD(cnic_udev_list);
 static DEFINE_RWLOCK(cnic_dev_lock);
@@ -445,14 +446,12 @@ int cnic_register_driver(int ulp_type, struct cnic_ulp_ops *ulp_ops)
 
 	/* Prevent race conditions with netdev_event */
 	rtnl_lock();
-	read_lock(&cnic_dev_lock);
 	list_for_each_entry(dev, &cnic_dev_list, list) {
 		struct cnic_local *cp = dev->cnic_priv;
 
 		if (!test_and_set_bit(ULP_F_INIT, &cp->ulp_flags[ulp_type]))
 			ulp_ops->cnic_init(dev);
 	}
-	read_unlock(&cnic_dev_lock);
 	rtnl_unlock();
 
 	return 0;
-- 
1.6.4.GIT


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