diff options
| author | Arjan Mels <arjan.mels@gmx.net> | 2011-04-05 20:26:11 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-04-06 15:51:13 -0700 |
| commit | d2dd0b07c3e725d386d20294ec906f7ddef207fa (patch) | |
| tree | 6b3d26aff120d41bac0a06b06ed03d7e88daa228 | |
| parent | 2f8c4c5494c2589e6cb9a62f399e61a1c4c2378d (diff) | |
| download | linux-d2dd0b07c3e725d386d20294ec906f7ddef207fa.tar.bz2 | |
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: Arjan 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: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/staging/usbip/stub_rx.c | 40 |
1 files changed, 15 insertions, 25 deletions
diff --git a/drivers/staging/usbip/stub_rx.c b/drivers/staging/usbip/stub_rx.c index 6445f12cb4fd..51fbd0986475 100644 --- a/drivers/staging/usbip/stub_rx.c +++ b/drivers/staging/usbip/stub_rx.c @@ -171,33 +171,23 @@ static int tweak_set_configuration_cmd(struct urb *urb) static int tweak_reset_device_cmd(struct urb *urb) { - struct usb_ctrlrequest *req; - __u16 value; - __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)); + struct stub_priv *priv = (struct stub_priv *) urb->context; + struct stub_device *sdev = priv->sdev; - /* all interfaces should be owned by usbip driver, so just reset it. */ - 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"); + usbip_uinfo("reset_device %s\n", dev_name(&urb->dev->dev)); - usb_unlock_device(urb->dev); - - return ret; + /* + * usb_lock_device_for_reset caused a deadlock: it causes the driver + * 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; } /* |