[3.16.y-ckt stable] Patch "rtlwifi: rtl8192cu: Fix kernel deadlock" has been added to staging queue

Luis Henriques luis.henriques at canonical.com
Thu May 28 10:56:15 UTC 2015


This is a note to let you know that I have just added a patch titled

    rtlwifi: rtl8192cu: Fix kernel deadlock

to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.16.y-queue

This patch is scheduled to be released in version 3.16.7-ckt13.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.16.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From c96d9dff614463d7d8a8dc6dcf2581e5d8238f73 Mon Sep 17 00:00:00 2001
From: Larry Finger <Larry.Finger at lwfinger.net>
Date: Fri, 24 Apr 2015 11:03:37 -0500
Subject: rtlwifi: rtl8192cu: Fix kernel deadlock

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 &&




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