[PATCH 3.16.y-ckt 012/110] rtlwifi: rtl8192cu: Fix kernel deadlock

[Luis Henriques]

3.16.7-ckt13 -stable review patch.  If anyone has any objections, please let me know.

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

From: Larry Finger <Larry.Finger at lwfinger.net>

commit 414b7e3b9ce8b0577f613e656fdbc36b34b444dd upstream.

The USB mini-driver in rtlwifi, which is used by rtl8192cu, issues a call to
usb_control_msg() with a timeout value of 0. In some instances where the
interface is shutting down, this infinite wait results in a CPU deadlock. A
one second timeout fixes this problem without affecting any normal operations.

This bug is reported at https://bugzilla.novell.com/show_bug.cgi?id=927786.

Reported-by: Bernhard Wiedemann <bwiedemann at suse.com>
Tested-by: Bernhard Wiedemann <bwiedemann at suse.com>
Signed-off-by: Larry Finger <Larry.Finger at lwfinger.net>
Cc: Bernhard Wiedemann <bwiedemann at suse.com>
Cc: Takashi Iwai<tiwai at suse.com>
Signed-off-by: Kalle Valo <kvalo at codeaurora.org>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/net/wireless/rtlwifi/usb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/rtlwifi/usb.c b/drivers/net/wireless/rtlwifi/usb.c
index 0398d3ea15b0..cdd0dd7a938a 100644
--- a/drivers/net/wireless/rtlwifi/usb.c
+++ b/drivers/net/wireless/rtlwifi/usb.c
@@ -126,7 +126,7 @@ static int _usbctrl_vendorreq_sync_read(struct usb_device *udev, u8 request,
 
 	do {
 		status = usb_control_msg(udev, pipe, request, reqtype, value,
-					 index, pdata, len, 0); /*max. timeout*/
+					 index, pdata, len, 1000);
 		if (status < 0) {
 			/* firmware download is checksumed, don't retry */
 			if ((value >= FW_8192C_START_ADDRESS &&