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

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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>
This commit is contained in:
Ben Skeggs 2020-01-28 14:39:26 +10:00
parent 0352029ed8
commit 0e6176c6d2
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/nouveau/nvkm/engine/disp/channv50.c
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@ -74,6 +74,8 @@ nv50_disp_chan_mthd(struct nv50_disp_chan *chan, int debug)
if (debug > subdev->debug)
return;
if (!mthd)
return;
for (i = 0; (list = mthd->data[i].mthd) != NULL; i++) {
u32 base = chan->head * mthd->addr;