sky2: initialize napi before registering device
authorStanislaw Gruszka <stf_xl@wp.pl>
Sat, 25 Jan 2014 10:34:54 +0000 (11:34 +0100)
committerDavid S. Miller <davem@davemloft.net>
Tue, 28 Jan 2014 00:39:53 +0000 (16:39 -0800)
commit731073b9c99d46c6b6c01184f67ee6f75fd7a163
treea184be898fb6131a9489d1956940d28663e6d36b
parenta452ce345d63ddf92cd101e4196569f8718ad319
sky2: initialize napi before registering device

There is race condition when call netif_napi_add() after
register_netdevice(), as ->open() can be called without napi initialized
and trigger BUG_ON() on napi_enable(), like on below messages:

[    9.699863] sky2: driver version 1.30
[    9.699960] sky2 0000:02:00.0: Yukon-2 EC Ultra chip revision 2
[    9.700020] sky2 0000:02:00.0: irq 45 for MSI/MSI-X
[    9.700498] ------------[ cut here ]------------
[    9.703391] kernel BUG at include/linux/netdevice.h:501!
[    9.703391] invalid opcode: 0000 [#1] PREEMPT SMP
<snip>
[    9.830018] Call Trace:
[    9.830018]  [<fa996169>] sky2_open+0x309/0x360 [sky2]
[    9.830018]  [<c1007210>] ? via_no_dac+0x40/0x40
[    9.830018]  [<c1007210>] ? via_no_dac+0x40/0x40
[    9.830018]  [<c135ed4b>] __dev_open+0x9b/0x120
[    9.830018]  [<c1431cbe>] ? _raw_spin_unlock_bh+0x1e/0x20
[    9.830018]  [<c135efd9>] __dev_change_flags+0x89/0x150
[    9.830018]  [<c135f148>] dev_change_flags+0x18/0x50
[    9.830018]  [<c13bb8e0>] devinet_ioctl+0x5d0/0x6e0
[    9.830018]  [<c13bcced>] inet_ioctl+0x6d/0xa0

To fix the problem patch changes the order of initialization.

Bug report:
https://bugzilla.kernel.org/show_bug.cgi?id=67151

Reported-and-tested-by: ebrahim.azarisooreh@gmail.com
Signed-off-by: Stanislaw Gruszka <stf_xl@wp.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/ethernet/marvell/sky2.c