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

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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.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Heikki Krogerus 2019-02-01 13:47:55 +03:00 • committed by Greg Kroah-Hartman

parent 382e8fa80d

commit b0fcdffdd6

1 changed files with 1 additions and 1 deletions

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drivers/usb/typec/class.c

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