tree 03414a38fcec06396b8d25b422db68c4400329ba
parent e371d46ae45488bcb112a99a7de462e9e3aa6764
author Sarah Sharp <sarah.a.sharp@linux.intel.com> 1309552540 -0700
committer Sarah Sharp <sarah.a.sharp@linux.intel.com> 1312216901 -0700

xhci: Don't submit commands or URBs to halted hosts.

Commit fccf4e86200b8f5edd9a65da26f150e32ba79808
"USB: Free bandwidth when usb_disable_device is called" caused a bit of an
issue when the xHCI host controller driver is unloaded.  It changed the
USB core to remove all endpoints when a USB device is disabled.  When the
driver is unloaded, it will remove the SuperSpeed split root hub, which
will disable all devices under that roothub and then halt the host
controller.  When the second High Speed split roothub is removed, the USB
core will attempt to disable the endpoints, which will submit a Configure
Endpoint command to a halted host controller.

The command will eventually time out, but it makes the xHCI driver unload
take *minutes* if there are a couple of USB 1.1/2.0 devices attached.  We
must halt the host controller when the SuperSpeed roothub is removed,
because we can't allow any interrupts from things like port status
changes.

Make several different functions not submit commands or URBs to the host
controller when the host is halted, by adding a check in
xhci_check_args().  xhci_check_args() is used by these functions:

xhci.c-int xhci_urb_enqueue()
xhci.c-int xhci_drop_endpoint()
xhci.c-int xhci_add_endpoint()
xhci.c-int xhci_check_bandwidth()
xhci.c-void xhci_reset_bandwidth()
xhci.c-static int xhci_check_streams_endpoint()
xhci.c-int xhci_discover_or_reset_device()

It's also used by xhci_free_dev().  However, we have to take special
care in that case, because we want the device memory to be freed if the
host controller is halted.

This patch should be backported to the 2.6.39 and 3.0 kernel.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: stable@kernel.org