[PATCH 3.16 03/61] slcan: not call free_netdev before rtnl_unlock in slcan_open

[Ben Hutchings]

3.16.85-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Oliver Hartkopp <socket...@hartkopp.net>

commit 2091a3d42b4f339eaeed11228e0cbe9d4f92f558 upstream.

As the description before netdev_run_todo, we cannot call free_netdev
before rtnl_unlock, fix it by reorder the code.

This patch is a 1:1 copy of upstream slip.c commit f596c87005f7
("slip: not call free_netdev before rtnl_unlock in slip_open").

Reported-by: yangerkun <yanger...@huawei.com>
Signed-off-by: Oliver Hartkopp <socket...@hartkopp.net>
Signed-off-by: David S. Miller <da...@davemloft.net>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
 drivers/net/can/slcan.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/net/can/slcan.c
+++ b/drivers/net/can/slcan.c
@@ -620,7 +620,10 @@ err_free_chan:
        sl->tty = NULL;
        tty->disc_data = NULL;
        clear_bit(SLF_INUSE, &sl->flags);
+       /* do not call free_netdev before rtnl_unlock */
+       rtnl_unlock();
        slc_free_netdev(sl->dev);
+       return err;
 
 err_exit:
        rtnl_unlock();