diff options
| author | Bart Westgeest <bart@elbrys.com> | 2011-11-01 15:01:28 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-12-09 09:21:41 -0800 |
| commit | 1890296ca407bbc02f8e0ea4683f8a885ad0ae1d (patch) | |
| tree | 7aa2eb480844ad4a3f242f06d7fe91e846905c7f /drivers/staging | |
| parent | 5aff28abc7e0ec1ddd562372ae4fa01e8e4d4073 (diff) | |
staging: usbip: bugfix for deadlock
commit 438957f8d4a84daa7fa5be6978ad5897a2e9e5e5 upstream.
Interrupts must be disabled prior to calling usb_hcd_unlink_urb_from_ep.
If interrupts are not disabled, it can potentially lead to a deadlock.
The deadlock is readily reproduceable on a slower (ARM based) device
such as the TI Pandaboard.
Signed-off-by: Bart Westgeest <bart@elbrys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/staging')
| -rw-r--r-- | drivers/staging/usbip/vhci_rx.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/staging/usbip/vhci_rx.c b/drivers/staging/usbip/vhci_rx.c index 8ed52063edb..7fd76fedde8 100644 --- a/drivers/staging/usbip/vhci_rx.c +++ b/drivers/staging/usbip/vhci_rx.c @@ -67,6 +67,7 @@ static void vhci_recv_ret_submit(struct vhci_device *vdev, { struct usbip_device *ud = &vdev->ud; struct urb *urb; + unsigned long flags; spin_lock(&vdev->priv_lock); @@ -107,9 +108,9 @@ static void vhci_recv_ret_submit(struct vhci_device *vdev, usbip_dbg_vhci_rx("now giveback urb %p\n", urb); - spin_lock(&the_controller->lock); + spin_lock_irqsave(&the_controller->lock, flags); usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb); - spin_unlock(&the_controller->lock); + spin_unlock_irqrestore(&the_controller->lock, flags); usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, urb->status); @@ -150,6 +151,7 @@ static void vhci_recv_ret_unlink(struct vhci_device *vdev, { struct vhci_unlink *unlink; struct urb *urb; + unsigned long flags; usbip_dump_header(pdu); @@ -181,9 +183,9 @@ static void vhci_recv_ret_unlink(struct vhci_device *vdev, urb->status = pdu->u.ret_unlink.status; usbip_uinfo("%d\n", urb->status); - spin_lock(&the_controller->lock); + spin_lock_irqsave(&the_controller->lock, flags); usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb); - spin_unlock(&the_controller->lock); + spin_unlock_irqrestore(&the_controller->lock, flags); usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, urb->status); |