drm/nouveau/pm: prevent freeing the wrong engine context
This fixes a crash when multiple PM engine contexts are created.
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Martin Peres <martin.peres@free.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/pm/base.c b/drivers/gpu/drm/nouveau/nvkm/engine/pm/base.c
index 2006c44..274457c 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/pm/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/pm/base.c
@@ -332,9 +332,12 @@
nvkm_perfctx_dtor(struct nvkm_object *object)
{
struct nvkm_pm *ppm = (void *)object->engine;
+ struct nvkm_perfctx *ctx = (void *)object;
+
mutex_lock(&nv_subdev(ppm)->mutex);
- nvkm_engctx_destroy(&ppm->context->base);
- ppm->context = NULL;
+ nvkm_engctx_destroy(&ctx->base);
+ if (ppm->context == ctx)
+ ppm->context = NULL;
mutex_unlock(&nv_subdev(ppm)->mutex);
}