staging: usbip: claim ports used by shared devices
A device should not be able to be used concurrently both by
the server and the client. Claiming the port used by the
shared device ensures no interface drivers bind to it and
that it is not usable from the server.
Signed-off-by: Valentina Manea <valentina.manea.m@gmail.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/usbip/stub_dev.c b/drivers/staging/usbip/stub_dev.c
index ee899f0..952743c 100644
--- a/drivers/staging/usbip/stub_dev.c
+++ b/drivers/staging/usbip/stub_dev.c
@@ -339,6 +339,7 @@
const char *udev_busid = dev_name(&udev->dev);
int err = 0;
struct bus_id_priv *busid_priv;
+ int rc;
dev_dbg(&udev->dev, "Enter\n");
@@ -388,6 +389,18 @@
busid_priv->sdev = sdev;
busid_priv->udev = udev;
+ /*
+ * Claim this hub port.
+ * It doesn't matter what value we pass as owner
+ * (struct dev_state) as long as it is unique.
+ */
+ rc = usb_hub_claim_port(udev->parent, udev->portnum,
+ (struct dev_state *) udev);
+ if (rc) {
+ dev_dbg(&udev->dev, "unable to claim port\n");
+ return rc;
+ }
+
err = stub_add_files(&udev->dev);
if (err) {
dev_err(&udev->dev, "stub_add_files for %s\n", udev_busid);
@@ -424,6 +437,7 @@
struct stub_device *sdev;
const char *udev_busid = dev_name(&udev->dev);
struct bus_id_priv *busid_priv;
+ int rc;
dev_dbg(&udev->dev, "Enter\n");
@@ -448,6 +462,14 @@
*/
stub_remove_files(&udev->dev);
+ /* release port */
+ rc = usb_hub_release_port(udev->parent, udev->portnum,
+ (struct dev_state *) udev);
+ if (rc) {
+ dev_dbg(&udev->dev, "unable to release port\n");
+ return;
+ }
+
/* If usb reset is called from event handler */
if (busid_priv->sdev->ud.eh == current)
return;
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 64ea219..e484933 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1819,6 +1819,7 @@
*powner = owner;
return rc;
}
+EXPORT_SYMBOL_GPL(usb_hub_claim_port);
int usb_hub_release_port(struct usb_device *hdev, unsigned port1,
struct dev_state *owner)
@@ -1834,6 +1835,7 @@
*powner = NULL;
return rc;
}
+EXPORT_SYMBOL_GPL(usb_hub_release_port);
void usb_hub_release_all_ports(struct usb_device *hdev, struct dev_state *owner)
{
diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h
index 8238577..222bbd2 100644
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -57,10 +57,6 @@
extern void usb_forced_unbind_intf(struct usb_interface *intf);
extern void usb_rebind_intf(struct usb_interface *intf);
-extern int usb_hub_claim_port(struct usb_device *hdev, unsigned port,
- struct dev_state *owner);
-extern int usb_hub_release_port(struct usb_device *hdev, unsigned port,
- struct dev_state *owner);
extern void usb_hub_release_all_ports(struct usb_device *hdev,
struct dev_state *owner);
extern bool usb_device_is_owned(struct usb_device *udev);
diff --git a/include/linux/usb.h b/include/linux/usb.h
index 22de4af..140a6a3 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -366,6 +366,8 @@
#endif
};
+struct dev_state;
+
/* ----------------------------------------------------------------------- */
struct usb_tt;
@@ -749,6 +751,11 @@
unsigned int iface_num,
unsigned int alt_num);
+/* port claiming functions */
+int usb_hub_claim_port(struct usb_device *hdev, unsigned port1,
+ struct dev_state *owner);
+int usb_hub_release_port(struct usb_device *hdev, unsigned port1,
+ struct dev_state *owner);
/**
* usb_make_path - returns stable device path in the usb tree