usb: retry reset if a device times out
authorOliver Neukum <oneukum@suse.com>
Wed, 10 Feb 2016 10:33:18 +0000 (11:33 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 12 Apr 2016 16:12:40 +0000 (09:12 -0700)
commit767c66a514263da4483faac532cbfd720a7bbeac
treee4287a24de7ce9af376e12b5d388922be13e7b78
parent53e7ab668c3415c4241158a4a1837a24182c01fa
usb: retry reset if a device times out

commit 264904ccc33c604d4b3141bbd33808152dfac45b upstream.

Some devices I got show an inability to operate right after
power on if they are already connected. They are beyond recovery
if the descriptors are requested multiple times. So in case of
a timeout we rather bail early and reset again. But it must be
done only on the first loop lest we get into a reset/time out
spiral that can be overcome with a retry.

This patch is a rework of a patch that fell through the cracks.
http://www.spinics.net/lists/linux-usb/msg103263.html

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/core/hub.c