diff options
| author | Michael Chan <mchan@broadcom.com> | 2011-07-15 06:53:58 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-07-16 10:13:19 -0700 |
| commit | cd6340199f65cad63262db0fd561bdcfd69df3bd (patch) | |
| tree | 860d6188cf381bb0c3a8de0f2a133e8e954b5586 /drivers/net/bnx2.c | |
| parent | 25009a1ae1171eda6bff44b7e44eb0e076713811 (diff) | |
bnx2: Close device if tx_timeout reset fails
Based on original patch and description from Flavio Leitner <fbl@redhat.com>
When bnx2_reset_task() is called, it will stop,
(re)initialize and start the interface to restore
the working condition.
The bnx2_init_nic() calls bnx2_reset_nic() which will
reset the chip and then calls bnx2_free_skbs() to free
all the skbs.
The problem happens when bnx2_init_chip() fails because
bnx2_reset_nic() will just return skipping the ring
initializations at bnx2_init_all_rings(). Later, the
reset task starts the interface again and the system
crashes due a NULL pointer access (no skb in the ring).
To fix it, we call dev_close() if bnx2_init_nic() fails.
One minor wrinkle to deal with is the cancel_work_sync()
call in bnx2_close() to cancel bnx2_reset_task(). The
call will wait forever because it is trying to cancel
itself and the workqueue will be stuck.
Since bnx2_reset_task() holds the rtnl_lock() and checks
for netif_running() before proceeding, there is no need
to cancel bnx2_reset_task() in bnx2_close() even if
bnx2_close() and bnx2_reset_task() are running concurrently.
The rtnl_lock() serializes the 2 calls.
We need to move the cancel_work_sync() call to
bnx2_remove_one() to make sure it is canceled before freeing
the netdev struct.
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Cc: Flavio Leitner <fbl@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/bnx2.c')
| -rw-r--r-- | drivers/net/bnx2.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c index 4816d6a5fe6..3ad9b70ef1b 100644 --- a/drivers/net/bnx2.c +++ b/drivers/net/bnx2.c @@ -6342,6 +6342,7 @@ static void bnx2_reset_task(struct work_struct *work) { struct bnx2 *bp = container_of(work, struct bnx2, reset_task); + int rc; rtnl_lock(); if (!netif_running(bp->dev)) { @@ -6351,7 +6352,14 @@ bnx2_reset_task(struct work_struct *work) bnx2_netif_stop(bp, true); - bnx2_init_nic(bp, 1); + rc = bnx2_init_nic(bp, 1); + if (rc) { + netdev_err(bp->dev, "failed to reset NIC, closing\n"); + bnx2_napi_enable(bp); + dev_close(bp->dev); + rtnl_unlock(); + return; + } atomic_set(&bp->intr_sem, 1); bnx2_netif_start(bp, true); @@ -6573,8 +6581,6 @@ bnx2_close(struct net_device *dev) { struct bnx2 *bp = netdev_priv(dev); - cancel_work_sync(&bp->reset_task); - bnx2_disable_int_sync(bp); bnx2_napi_disable(bp); del_timer_sync(&bp->timer); @@ -8404,6 +8410,7 @@ bnx2_remove_one(struct pci_dev *pdev) unregister_netdev(dev); del_timer_sync(&bp->timer); + cancel_work_sync(&bp->reset_task); if (bp->mips_firmware) release_firmware(bp->mips_firmware); |