e100: Fix the TX workqueue race

Nothing stops the workqueue being left to run in parallel with close or a
few other operations. This causes double unmaps and the like.

See kerneloops.org #1041230 for an example

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/e100.c b/drivers/net/e100.c
index b997e57..7910803 100644 (file)
--- a/drivers/net/e100.c
+++ b/drivers/net/e100.c
@@ -166,6 +166,7 @@
 #include <linux/ethtool.h>
 #include <linux/string.h>
 #include <linux/firmware.h>
+#include <linux/rtnetlink.h>
 #include <asm/unaligned.h>
 
 
@@ -2265,8 +2266,13 @@ static void e100_tx_timeout_task(struct work_struct *work)
 
        DPRINTK(TX_ERR, DEBUG, "scb.status=0x%02X\n",
                ioread8(&nic->csr->scb.status));
-       e100_down(netdev_priv(netdev));
-       e100_up(netdev_priv(netdev));
+
+       rtnl_lock();
+       if (netif_running(netdev)) {
+               e100_down(netdev_priv(netdev));
+               e100_up(netdev_priv(netdev));
+       }
+       rtnl_unlock();
 }
 
 static int e100_loopback_test(struct nic *nic, enum loopback loopback_mode)