drm/vc4: kms: Fix return code check
commit f9277679 upstream. The HVS global state functions return an error pointer, but in most cases we check if it's NULL, possibly resulting in an invalid pointer dereference. Fixes: 9ec03d7f ("drm/vc4: kms: Wait on previous FIFO users before a commit") Signed-off-by:Maxime Ripard <maxime@cerno.tech> Reviewed-by:
Dave Stevenson <dave.stevenson@raspberrypi.com> Tested-by:
Jian-Hong Pan <jhp@endlessos.org> Link: https://lore.kernel.org/r/20211117094527.146275-3-maxime@cerno.tech Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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