tree a9fd4213b6f9fb29ac7872c4543b02a160aff517
parent 9dc447d23d82e92679fe3d1c65c3a5eb7550168c
author Ben Skeggs <bskeggs@redhat.com> 1580186366 +1000
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1582900959 +0100

drm/nouveau/disp/nv50-: prevent oops when no channel method map provided

[ Upstream commit 0e6176c6d286316e9431b4f695940cfac4ffe6c2 ]

The implementations for most channel types contains a map of methods to
priv registers in order to provide debugging info when a disp exception
has been raised.

This info is missing from the implementation of PIO channels as they're
rather simplistic already, however, if an exception is raised by one of
them, we'd end up triggering a NULL-pointer deref.  Not ideal...

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=206299
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>