Commit b3a6056e authored Feb 01, 2019 by Heikki Krogerus Committed by Will McVicker Mar 12, 2020

UPSTREAM: usb: typec: Prepare alt mode enter/exit reporting for UCSI alt mode support



Because of UCSI, we have to support alt mode enter/exit
reporting even when there is no alt mode driver bind to the
alt mode device. With UCSI a firmware handles the alternate
modes, and the modes are entered automatically from OS PoW.

Changing typec_altmode_update_active() so that the driver
module ref count is incremented/decremented only if there
really is a driver for the alt mode. That avoids a NULL
pointer dereference from happening when the driver is
missing.

Bug: 150877929
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Change-Id: If8dd297875ff88c2c82bdb1d43eb2c72469e9bf0
Signed-off-by: Will McVicker <willmcvicker@google.com>
(cherry picked from commit b0fcdffdd6262d49d509a2945b2c2375a84f28af)

parent a6655790

drivers/usb/typec/class.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -277,7 +277,7 @@ void typec_altmode_update_active(struct typec_altmode *adev, bool active)
		if (adev->active == active)
		return;

		if (!is_typec_port(adev->dev.parent)) {
		if (!is_typec_port(adev->dev.parent) && adev->dev.driver) {
		if (!active)
		module_put(adev->dev.driver->owner);
		else