diff options
| author | Arjan Mels <arjan.mels@gmx.net> | 2011-04-05 20:26:11 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-04-14 16:53:21 -0700 |
| commit | 98d7db5f32b1c75b31a8c5f75eb134136af54f85 (patch) | |
| tree | 2eeeef5142705fe2420cff7f9362a69e7659d2c9 /drivers/staging | |
| parent | a82a276bdb44a3b48e8f2b8dce457073c5f63123 (diff) | |
staging: usbip: bugfixes related to kthread conversion
commit d2dd0b07c3e725d386d20294ec906f7ddef207fa upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/staging')
| -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 815fb7cc3b2..a9cdc4c1d61 100644 --- a/drivers/staging/usbip/stub_rx.c +++ b/drivers/staging/usbip/stub_rx.c @@ -168,33 +168,23 @@ 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; } /* |