Commit 2941482e authored by Ben Skeggs's avatar Ben Skeggs
Browse files

drm/nouveau: protect ramht_find() from oopsing if on channel without ramht



This doesn't actually happen now, but there's a test case for an earlier
kernel where a GPU error is signalled on one of nv50's fake channels, and
the ramht lookup by the IRQ handler triggered an oops.

This adds a check for RAMHT's existance on a channel before looking up
an object handle.

Signed-off-by: default avatarBen Skeggs <bskeggs@redhat.com>
parent 185abecc
......@@ -197,6 +197,9 @@ nouveau_ramht_find(struct nouveau_channel *chan, u32 handle)
struct nouveau_gpuobj *gpuobj = NULL;
unsigned long flags;
if (unlikely(!chan->ramht))
return NULL;
spin_lock_irqsave(&ramht->lock, flags);
list_for_each_entry(entry, &chan->ramht->entries, head) {
if (entry->channel == chan && entry->handle == handle) {
......
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