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drm/nouveau/mmu: don't attempt to dereference vmm without valid instance pointer

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Fixes oopses in certain failure paths.

Signed-off-by: Ben Skeggs <[email protected]>
This commit is contained in:
Ben Skeggs 2018-08-28 14:10:42 +10:00
commit 51ed833c88
1 changed files with 1 additions and 1 deletions
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drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmm.c
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@ -1423,7 +1423,7 @@ nvkm_vmm_get(struct nvkm_vmm *vmm, u8 page, u64 size, struct nvkm_vma **pvma)
void
nvkm_vmm_part(struct nvkm_vmm *vmm, struct nvkm_memory *inst)
{
if (vmm->func->part && inst) {
if (inst && vmm->func->part) {
mutex_lock(&vmm->mutex);
vmm->func->part(vmm, inst);
mutex_unlock(&vmm->mutex);