[BNX2]: Fix rtnl deadlock in bnx2_close

This fixes an rtnl deadlock problem when flush_scheduled_work() is
called from bnx2_close(). In rare cases, linkwatch_event() may be on
the workqueue from a previous close of a different device and it will
try to get the rtnl lock which is already held by dev_close().

The fix is to set a flag if we are in the reset task which is run
from the workqueue. bnx2_close() will loop until the flag is cleared.
As suggested by Jeff Garzik, the loop is changed to call msleep(1)
instead of yield() in the original patch.

flush_scheduled_work() is also moved to bnx2_remove_one() before the
netdev is freed.

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

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/net/bnx2.h b/drivers/net/bnx2.h
index 8214a2853d0d..63b94ca0018b 100644
--- a/drivers/net/bnx2.h
+++ b/drivers/net/bnx2.h
@@ -3874,6 +3874,7 @@ struct bnx2 {
         int                     timer_interval;
         struct                  timer_list timer;
         struct work_struct      reset_task;
+        int                     in_reset_task;
 
         /* Used to synchronize phy accesses. */
         spinlock_t              phy_lock;