linux-kernel - [PATCH] staging: usbip: stub_dev: Fixed oops during removal of usbip

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Message-Id: <1347940806-4653-1-git-send-email-navinp@cdac.in>
Date:	Tue, 18 Sep 2012 09:30:06 +0530
From:	navin patidar <navinp@...c.in>
To:	gregkh@...uxfoundation.org, mfm@...eddisk.com
Cc:	linux-usb@...r.kernel.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, navin patidar <navinp@...c.in>
Subject: [PATCH] staging: usbip: stub_dev: Fixed oops during removal of usbip_host

stub_device_reset should set kernel thread pointers to NULL.
so that at the time of usbip_host removal stub_shoutdown_connection
doesn't try to kill kernel threads which are already killed.

Signed-off-by: navin patidar <navinp@...c.in>
---
 drivers/staging/usbip/stub_dev.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/usbip/stub_dev.c b/drivers/staging/usbip/stub_dev.c
index 92ced35..447a98c 100644
--- a/drivers/staging/usbip/stub_dev.c
+++ b/drivers/staging/usbip/stub_dev.c
@@ -198,10 +198,8 @@ static void stub_shutdown_connection(struct usbip_device *ud)
 	 * tcp_socket is freed after threads are killed so that usbip_xmit does
 	 * not touch NULL socket.
 	 */
-	if (ud->tcp_socket) {
+	if (ud->tcp_socket)
 		sock_release(ud->tcp_socket);
-		ud->tcp_socket = NULL;
-	}
 
 	/* 3. free used data */
 	stub_device_cleanup_urbs(sdev);
@@ -233,6 +231,9 @@ static void stub_device_reset(struct usbip_device *ud)
 
 	dev_dbg(&udev->dev, "device reset");
 
+	ud->tcp_socket = NULL;
+	ud->tcp_rx = NULL;
+	ud->tcp_tx = NULL;
 	ret = usb_lock_device_for_reset(udev, sdev->interface);
 	if (ret < 0) {
 		dev_err(&udev->dev, "lock for reset\n");
-- 
1.7.9.5

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