Commit d2dd0b07 authored by Arjan Mels's avatar Arjan Mels Committed by Greg Kroah-Hartman

staging: usbip: bugfixes related to kthread conversion

When doing a usb port reset do a queued reset instead to prevent a
deadlock: the reset will cause the driver to unbind, causing the
usb_driver_lock_for_reset to stall.
Signed-off-by: default avatarArjan Mels <arjan.mels@gmx.net>
Cc: Takahiro Hirofuchi <hirofuchi@users.sourceforge.net>
Cc: Max Vozeler <max@vozeler.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: stable <stable@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 2f8c4c54
...@@ -171,33 +171,23 @@ static int tweak_set_configuration_cmd(struct urb *urb) ...@@ -171,33 +171,23 @@ static int tweak_set_configuration_cmd(struct urb *urb)
static int tweak_reset_device_cmd(struct urb *urb) static int tweak_reset_device_cmd(struct urb *urb)
{ {
struct usb_ctrlrequest *req; struct stub_priv *priv = (struct stub_priv *) urb->context;
__u16 value; struct stub_device *sdev = priv->sdev;
__u16 index;
int ret;
req = (struct usb_ctrlrequest *) urb->setup_packet;
value = le16_to_cpu(req->wValue);
index = le16_to_cpu(req->wIndex);
usbip_uinfo("reset_device (port %d) to %s\n", index,
dev_name(&urb->dev->dev));
/* all interfaces should be owned by usbip driver, so just reset it. */ usbip_uinfo("reset_device %s\n", dev_name(&urb->dev->dev));
ret = usb_lock_device_for_reset(urb->dev, NULL);
if (ret < 0) {
dev_err(&urb->dev->dev, "lock for reset\n");
return ret;
}
/* try to reset the device */
ret = usb_reset_device(urb->dev);
if (ret < 0)
dev_err(&urb->dev->dev, "device reset\n");
usb_unlock_device(urb->dev); /*
* usb_lock_device_for_reset caused a deadlock: it causes the driver
return ret; * to unbind. In the shutdown the rx thread is signalled to shut down
* but this thread is pending in the usb_lock_device_for_reset.
*
* Instead queue the reset.
*
* Unfortunatly an existing usbip connection will be dropped due to
* driver unbinding.
*/
usb_queue_reset_device(sdev->interface);
return 0;
} }
/* /*
......
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