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Message-Id: <20150603063930.846399734@linuxfoundation.org>
Date: Wed, 3 Jun 2015 20:43:23 +0900
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Bernhard Wiedemann <bwiedemann@...e.com>,
Larry Finger <Larry.Finger@...inger.net>,
Takashi Iwai <tiwai@...e.com>,
Kalle Valo <kvalo@...eaurora.org>
Subject: [PATCH 3.14 55/64] rtlwifi: rtl8192cu: Fix kernel deadlock
3.14-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: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
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
@@ -126,7 +126,7 @@ static int _usbctrl_vendorreq_sync_read(
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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