From 414b7e3b9ce8b0577f613e656fdbc36b34b444dd Mon Sep 17 00:00:00 2001
From: Larry Finger <Larry.Finger@lwfinger.net>
Date: Fri, 24 Apr 2015 11:03:37 -0500
Subject: [PATCH] rtlwifi: rtl8192cu: Fix kernel deadlock
Git-commit: 414b7e3b9ce8b0577f613e656fdbc36b34b444dd
Patch-mainline: 4.1-rc4
References: bnc#927786

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@suse.com>
Tested-by: Bernhard Wiedemann <bwiedemann@suse.com>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Stable <stable@vger.kernel.org>
Cc: Bernhard Wiedemann <bwiedemann@suse.com>
Cc: Takashi Iwai<tiwai@suse.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/net/wireless/rtlwifi/usb.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/wireless/rtlwifi/usb.c
+++ b/drivers/net/wireless/rtlwifi/usb.c
@@ -101,7 +101,7 @@ static int _usbctrl_vendorreq_sync_read(
 	reqtype =  REALTEK_USB_VENQT_READ;
 
 	status = usb_control_msg(udev, pipe, request, reqtype, value, index,
-				 pdata, len, 0); /* max. timeout */
+				 pdata, len, 1000);
 
 	if (status < 0)
 		printk(KERN_ERR "reg 0x%x, usbctrl_vendorreq TimeOut! "
