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drm/nouveau: Don't leak runtime pm ref on driver unload

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nouveau_drm_load() calls pm_runtime_put() if nouveau_runtime_pm != 0,
but nouveau_drm_unload() calls pm_runtime_get_sync() unconditionally.
We therefore leak a runtime pm ref whenever nouveau is loaded with
runpm=0 and then unloaded. The GPU will subsequently never runtime
suspend even if nouveau is loaded again with runpm=1.

Fix by taking the runtime pm ref under the same condition that it was
released on driver load.

Fixes: 5addcf0a5f ("nouveau: add runtime PM support (v0.9)")
Cc: Dave Airlie <airlied@redhat.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Reported-by: Karol Herbst <karolherbst@gmail.com>
Tested-by: Karol Herbst <karolherbst@gmail.com>
Tested-by: Peter Wu <peter@lekensteyn.nl>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1544b82007037601fbc510b1a50edc56c529e75f.1465392124.git.lukas@wunner.de
This commit is contained in:
Lukas Wunner 2016-06-08 18:47:27 +02:00 committed by Daniel Vetter
parent 2a3467063a
commit c1b16b4560
1 changed files with 4 additions and 1 deletions
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3
drivers/gpu/drm/nouveau/nouveau_drm.c
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@ -490,7 +490,10 @@ nouveau_drm_unload(struct drm_device *dev)
{
struct nouveau_drm *drm = nouveau_drm(dev);
if (nouveau_runtime_pm != 0) {
pm_runtime_get_sync(dev->dev);
}
nouveau_fbcon_fini(dev);
nouveau_accel_fini(drm);
nouveau_hwmon_fini(dev);