USB: add flag for HCDs that can't receive wakeup requests (isp1760-hcd)
commit 074f9dd55f9cab1b82690ed7e44bcf38b9616ce0 upstream.
Currently the USB stack assumes that all host controller drivers are
capable of receiving wakeup requests from downstream devices.
However, this isn't true for the isp1760-hcd driver, which means that
it isn't safe to do a runtime suspend of any device attached to a
root-hub port if the device requires wakeup.
This patch adds a "cant_recv_wakeups" flag to the usb_hcd structure
and sets the flag in isp1760-hcd. The core is modified to prevent a
direct child of the root hub from being put into runtime suspend with
wakeup enabled if the flag is set.
Signed-off-by: Alan Stern <email@example.com>
Tested-by: Nicolas Pitre <firstname.lastname@example.org>
Signed-off-by: Greg Kroah-Hartman <email@example.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <firstname.lastname@example.org>
3 files changed