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

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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: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2010-09-03 10:25:02 +10:00
parent 185abeccab
commit 2941482ead
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/nouveau/nouveau_ramht.c
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@ -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) {