[PATCH 3.16 241/410] usbip: keep usbip_device sockfd state in sync with tcp_socket

[Ben Hutchings <ben@xxxxxxxxxxxxxxx>]

3.16.57-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>

commit 009f41aed4b3e11e6dc1e3c07377a10c20f1a5ed upstream.

Keep usbip_device sockfd state in sync with tcp_socket. When tcp_socket
is reset to null, reset sockfd to -1 to keep it in sync.

Signed-off-by: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
[bwh: Backported to 3.16: adjust filenames]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 drivers/staging/usbip/stub_dev.c | 3 +++
 drivers/staging/usbip/vhci_hcd.c | 2 ++
 2 files changed, 5 insertions(+)

--- a/drivers/staging/usbip/stub_dev.c
+++ b/drivers/staging/usbip/stub_dev.c
@@ -114,6 +114,7 @@ static ssize_t store_sockfd(struct devic
 			goto err;
 
 		sdev->ud.tcp_socket = socket;
+		sdev->ud.sockfd = sockfd;
 
 		spin_unlock_irq(&sdev->ud.lock);
 
@@ -213,6 +214,7 @@ static void stub_shutdown_connection(str
 	if (ud->tcp_socket) {
 		sockfd_put(ud->tcp_socket);
 		ud->tcp_socket = NULL;
+		ud->sockfd = -1;
 	}
 
 	/* 3. free used data */
@@ -307,6 +309,7 @@ static struct stub_device *stub_device_a
 	sdev->ud.status		= SDEV_ST_AVAILABLE;
 	spin_lock_init(&sdev->ud.lock);
 	sdev->ud.tcp_socket	= NULL;
+	sdev->ud.sockfd		= -1;
 
 	INIT_LIST_HEAD(&sdev->priv_init);
 	INIT_LIST_HEAD(&sdev->priv_tx);
--- a/drivers/staging/usbip/vhci_hcd.c
+++ b/drivers/staging/usbip/vhci_hcd.c
@@ -786,6 +786,7 @@ static void vhci_shutdown_connection(str
 	if (vdev->ud.tcp_socket) {
 		sockfd_put(vdev->ud.tcp_socket);
 		vdev->ud.tcp_socket = NULL;
+		vdev->ud.sockfd = -1;
 	}
 	pr_info("release socket\n");
 
@@ -833,6 +834,7 @@ static void vhci_device_reset(struct usb
 	if (ud->tcp_socket) {
 		sockfd_put(ud->tcp_socket);
 		ud->tcp_socket = NULL;
+		ud->sockfd = -1;
 	}
 	ud->status = VDEV_ST_NULL;