xhci: Verify the device is still present in xhci_cmd_submit()

Make sure the USB device is still present before altering the xhci
"slot" for it.  It appears some controllers will hang if a request is
sent to a port no longer connected.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
1 file changed
tree: 037ca9d23f7b8c8880e2a9c5da5ee4295612048c
  1. .gitignore
  2. COPYING
  3. COPYING.LESSER
  4. Makefile
  5. README
  6. docs/
  7. scripts/
  8. src/
  9. vgasrc/