USB: Handle auto-transition from hot to warm reset.
authorSarah Sharp <sarah.a.sharp@linux.intel.com>
Wed, 14 Nov 2012 23:58:52 +0000 (15:58 -0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 17 Jan 2013 16:46:38 +0000 (08:46 -0800)
commit709a9d3cd1b75e167b1eafcc42a5f2b264f2e20a
tree3293317c1911e3a0e417d874e511b4a5245d854e
parent39c5cda91b2d77399030ea038626c85fac182f89
USB: Handle auto-transition from hot to warm reset.

commit 1c7439c61fa6516419c32a9824976334ea969d47 upstream.

USB 3.0 hubs and roothubs will automatically transition a failed hot
reset to a warm (BH) reset.  In that case, the warm reset change bit
will be set, and the link state change bit may also be set.  Change
hub_port_finish_reset to unconditionally clear those change bits for USB
3.0 hubs.  If these bits are not cleared, we may lose port change events
from the roothub.

This commit should be backported to kernels as old as 3.2, that contain
the commit 75d7cf72ab9fa01dc70877aa5c68e8ef477229dc "usbcore: refine
warm reset logic".

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/core/hub.c