[PATCH 4.9 041/145] usbip: keep usbip_device sockfd state in sync with tcp_socket

[Greg Kroah-Hartman]

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

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

From: Shuah Khan <shua...@osg.samsung.com>

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 <shua...@osg.samsung.com>
Cc: sta...@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/usb/usbip/stub_dev.c |    3 +++
 drivers/usb/usbip/vhci_hcd.c |    2 ++
 2 files changed, 5 insertions(+)

--- a/drivers/usb/usbip/stub_dev.c
+++ b/drivers/usb/usbip/stub_dev.c
@@ -87,6 +87,7 @@ static ssize_t store_sockfd(struct devic
                        goto err;
 
                sdev->ud.tcp_socket = socket;
+               sdev->ud.sockfd = sockfd;
 
                spin_unlock_irq(&sdev->ud.lock);
 
@@ -186,6 +187,7 @@ 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 */
@@ -280,6 +282,7 @@ 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/usb/usbip/vhci_hcd.c
+++ b/drivers/usb/usbip/vhci_hcd.c
@@ -832,6 +832,7 @@ 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");
 
@@ -879,6 +880,7 @@ 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;