USB: UHCI: fix for suspend of virtual HP controller
commit 997ff893603c6455da4c5e26ba1d0f81adfecdfc upstream.
HP's virtual UHCI host controller takes a long time to suspend
(several hundred microseconds), even when no devices are attached.
This provokes a warning message from uhci-hcd in the auto-stop case.
To prevent this from happening, this patch adds a test to avoid
performing an auto-stop when the wait_for_hp quirk flag is set. The
controller will still suspend through the normal runtime PM mechanism.
And since that pathway includes a 1-ms delay, the slowness of the
virtual hardware won't matter.
Signed-off-by: Alan Stern <firstname.lastname@example.org>
Reported-and-tested-by: ZhenHua <email@example.com>
Signed-off-by: Greg Kroah-Hartman <firstname.lastname@example.org>
Signed-off-by: Ben Hutchings <email@example.com>
1 file changed