linux-kernel - [PATCH 3.19.y-ckt 028/146] rtlwifi: rtl8192cu: Fix kernel deadlock

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Message-Id: <1434579851-1719-29-git-send-email-kamal@canonical.com>
Date:	Wed, 17 Jun 2015 15:22:13 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Larry Finger <Larry.Finger@...inger.net>,
	Bernhard Wiedemann <bwiedemann@...e.com>,
	Takashi Iwai <tiwai@...e.com>,
	Kalle Valo <kvalo@...eaurora.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 028/146] rtlwifi: rtl8192cu: Fix kernel deadlock

3.19.8-ckt2 -stable review patch.  If anyone has any objections, please let me know.

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

From: Larry Finger <Larry.Finger@...inger.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@...e.com>
Tested-by: Bernhard Wiedemann <bwiedemann@...e.com>
Signed-off-by: Larry Finger <Larry.Finger@...inger.net>
Cc: Bernhard Wiedemann <bwiedemann@...e.com>
Cc: Takashi Iwai<tiwai@...e.com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Kamal Mostafa <kamal@...onical.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 46ee956..27cd6ca 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 &&
-- 
1.9.1

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