xhci: zero usb device slot_id member when disabling and freeing a xhci slot

BugLink: http://bugs.launchpad.net/bugs/1783418
[ Upstream commit a400efe455f7b61ac9a801ac8d0d01f8c8d82dd5 ]

set udev->slot_id to zero when disabling and freeing the xhci slot.
Prevents usb core from calling xhci with a stale slot id.

xHC controller may be reset during resume to recover from some error.
All slots are unusable as they are disabled and freed.
xhci driver starts slot enumeration again from 1 in the order they are
enabled. In the worst case a stale udev->slot_id for one device matches
a newly enabled slot_id for a different device, causing us to
perform a action on the wrong device.

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index ee980c3dec54fb5bd46af2f7d506b4cdaef36cfb..ce715580b42a5427ec69a5e13a0b0753d05d7017 100644 (file)
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -913,6 +913,8 @@ void xhci_free_virt_device(struct xhci_hcd *xhci, int slot_id)
        if (dev->out_ctx)
                xhci_free_container_ctx(xhci, dev->out_ctx);
 
+       if (dev->udev && dev->udev->slot_id)
+               dev->udev->slot_id = 0;
        kfree(xhci->devs[slot_id]);
        xhci->devs[slot_id] = NULL;
 }