tree baade98427207a0086b018b153947ae2da7a5802
parent fa41019c7aa172fde075849834409d23eb49f582
author Alan Stern <stern@rowland.harvard.edu> 1216648586 -0400
committer Greg Kroah-Hartman <gregkh@suse.de> 1218673969 -0700

USB: OHCI: fix system hang caused by earlier patch

This patch (as1114) fixes a problem that was revealed by an earlier
patch (as1069b).  Some broken controllers seem never to turn off their
RHCS interrupt status bit, even when told to do so.  As a result they
generate an interrupt storm and hang the system.

The patch avoids enabling RHSC interrupt requests when the RHCS status
bit is already set.  This should have no adverse affects on normal
controllers, since they won't set the status bit until a root-hub
status change actually occurs, in which case we wouldn't enable RHSC
interrupt requests anyway -- we would wait until the status change had
been processed and cleared.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested by: Andrey Borzenkov <arvidjaar@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>