[2/9] drm/nouveau: Forbid runtime pm on driver unload
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Message ID fe5241ee678ca7049b7d59553abe98f1a3f4f28d.1464103767.git.lukas@wunner.de
State New
Headers show

Commit Message

Lukas Wunner May 24, 2016, 4:03 p.m. UTC
The PCI core calls pm_runtime_forbid() on device probe in pci_pm_init(),
making this the default state when nouveau is loaded. nouveau_drm_load()
therefore calls pm_runtime_allow(), but there's no pm_runtime_forbid()
in nouveau_drm_unload() to balance it. Add it so that we leave the
device in the same state that we found it.

This isn't a bug, it's just good housekeeping. When nouveau is first
loaded with runpm=1, then unloaded and loaded again with runpm=0,
pm_runtime_forbid() will be called from nouveau_pmops_runtime_idle() or
nouveau_pmops_runtime_suspend(), so the behaviour is correct. The nvidia
blob doesn't use runtime pm, but if it ever does, this commit avoids
that it has to clean up behind nouveau.

Tested-by: Karol Herbst <nouveau@karolherbst.de>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
---
 drivers/gpu/drm/nouveau/nouveau_drm.c | 1 +
 1 file changed, 1 insertion(+)

Patch
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diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c
index faf7438..ef784b7 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
@@ -500,6 +500,7 @@  nouveau_drm_unload(struct drm_device *dev)
 
 	if (nouveau_runtime_pm != 0) {
 		pm_runtime_get_sync(dev->dev);
+		pm_runtime_forbid(dev->dev);
 	}
 
 	nouveau_fbcon_fini(dev);