[PATCH] rt2x00: usb: fix reset resume

[Stanislaw Gruszka <sgruszka@redhat.com>]

Patch fixes warnings like below happened on resume:

WARNING: at net/mac80211/driver-ops.h:12 check_sdata_in_driver+0x32/0x34()

Problem is that in __ieee80211_susped() we remove sdata (i.e wlan0
interface) and then during resume we call usb_unbind_interface() ->
ieee80211_unregister_hw() with sdata removed.

Patch fixes problem by adding .reset_resume calback, hence we do not
unbind usb device on resume. This callback can be the same as normal
.resume callback, sice we do all needed initalization during interface
start, which is performed on resume [ ieee80211_resume() ->
ieee80211_reconfig() -> rt2x00mac_start() -> rt2x00lib_start ].

Resolves:
https://bugzilla.kernel.org/show_bug.cgi?id=48041

Reported-by: David Herrmann <dh.herrmann@googlemail.com>
Reported-and-tested-by: Stephen Boyd <bebarino@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
---
 drivers/net/wireless/rt2x00/rt2500usb.c |    1 +
 drivers/net/wireless/rt2x00/rt2800usb.c |    1 +
 drivers/net/wireless/rt2x00/rt73usb.c   |    1 +
 3 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/net/wireless/rt2x00/rt2500usb.c b/drivers/net/wireless/rt2x00/rt2500usb.c
index a12e84f..6b2e1e4 100644
--- a/drivers/net/wireless/rt2x00/rt2500usb.c
+++ b/drivers/net/wireless/rt2x00/rt2500usb.c
@@ -1988,6 +1988,7 @@ static struct usb_driver rt2500usb_driver = {
 	.disconnect	= rt2x00usb_disconnect,
 	.suspend	= rt2x00usb_suspend,
 	.resume		= rt2x00usb_resume,
+	.reset_resume	= rt2x00usb_resume,
 	.disable_hub_initiated_lpm = 1,
 };
 
diff --git a/drivers/net/wireless/rt2x00/rt2800usb.c b/drivers/net/wireless/rt2x00/rt2800usb.c
index c9e9370..3b8fb5a 100644
--- a/drivers/net/wireless/rt2x00/rt2800usb.c
+++ b/drivers/net/wireless/rt2x00/rt2800usb.c
@@ -1282,6 +1282,7 @@ static struct usb_driver rt2800usb_driver = {
 	.disconnect	= rt2x00usb_disconnect,
 	.suspend	= rt2x00usb_suspend,
 	.resume		= rt2x00usb_resume,
+	.reset_resume	= rt2x00usb_resume,
 	.disable_hub_initiated_lpm = 1,
 };
 
diff --git a/drivers/net/wireless/rt2x00/rt73usb.c b/drivers/net/wireless/rt2x00/rt73usb.c
index e5eb43b..24eec66 100644
--- a/drivers/net/wireless/rt2x00/rt73usb.c
+++ b/drivers/net/wireless/rt2x00/rt73usb.c
@@ -2535,6 +2535,7 @@ static struct usb_driver rt73usb_driver = {
 	.disconnect	= rt2x00usb_disconnect,
 	.suspend	= rt2x00usb_suspend,
 	.resume		= rt2x00usb_resume,
+	.reset_resume	= rt2x00usb_resume,
 	.disable_hub_initiated_lpm = 1,
 };
 
-- 
1.7.1