xhci: fix null pointer dereference in stop command timeout function

The stop endpoint command has its own 5 second timeout timer.
If the timeout function is triggered between USB3 and USB2 host
removal it will try to call usb_hc_died(xhci_to_hcd(xhci)->primary_hcd)

the ->primary_hcd will be set to NULL at USB3 hcd removal.

Fix this by first checking if the PCI host is being removed, and
also by using only xhci_to_hcd() as it will always return the primary
hcd.

CC: <stable@vger.kernel.org>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

path: root/packages/uw7/Prototype

i pkginfo
d none /usr ? ? ?
d none /usr/local 0755 root bin
d none /usr/local/bin 0755 root bin
d none /usr/local/man 0755 root bin
d none /usr/local/man/man1 0755 root bin
! search /usr/local/bin
f none /usr/local/bin/cscope 0755 root bin
f none /usr/local/bin/ocs 0755 root bin
! search /usr/local/man/man1
f none /usr/local/man/man1/cscope.1 0644 root bin