tg3: tg3_reset_task() needs to use rtnl_lock to synchronize

Currently tg3_reset_task() uses only tp->lock for synchronizing with code
paths like tg3_open() etc. But since tp->lock is released before doing
synchronize_irq(), rtnl_lock should be taken in tg3_reset_task() to
synchronize it with other code paths.

Reported-by: Peter Hurley <peter@hurleysoftware.com>
Tested-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Prashant Sreedharan <prashant@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 2dbd4aea01f3..9247ae1412cc 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -11103,11 +11103,13 @@ static void tg3_reset_task(struct work_struct *work)
         struct tg3 *tp = container_of(work, struct tg3, reset_task);
         int err;
 
+        rtnl_lock();
         tg3_full_lock(tp, 0);
 
         if (!netif_running(tp->dev)) {
                 tg3_flag_clear(tp, RESET_TASK_PENDING);
                 tg3_full_unlock(tp);
+                rtnl_unlock();
                 return;
         }
 
@@ -11140,6 +11142,7 @@ out:
                 tg3_phy_start(tp);
 
         tg3_flag_clear(tp, RESET_TASK_PENDING);
+        rtnl_unlock();
 }
 
 static int tg3_request_irq(struct tg3 *tp, int irq_num)