[PATCH] drm/panfrost: add missing pm_runtime_dont_use_autosuspend() calls

[PATCH] drm/panfrost: add missing pm_runtime_dont_use_autosuspend() calls

[Joshua Crofts]

panfrost_remove() and panfrost_probe() disable PM runtime on teardown or
failure but don't call the pm_runtime_dont_use_autosuspend() function,
causing potential resource leaks.

Add the missing function calls.

Found using Coccinelle.

Fixes: 5c0c825ae4c6 ("drm/panfrost: Replace DRM driver allocation method with newer one")
Cc: <stable@vger.kernel.org>
Signed-off-by: Joshua Crofts <joshua.crofts1@gmail.com>
---
 drivers/gpu/drm/panfrost/panfrost_drv.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
index 36cc2e67a308..74e8e5783f9b 100644
--- a/drivers/gpu/drm/panfrost/panfrost_drv.c
+++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
@@ -1012,6 +1012,7 @@ static int panfrost_probe(struct platform_device *pdev)
 err_out2:
 	drm_dev_unregister(&pfdev->base);
 err_out1:
+	pm_runtime_dont_use_autosuspend(pfdev->base.dev);
 	pm_runtime_disable(pfdev->base.dev);
 	panfrost_device_fini(pfdev);
 	pm_runtime_set_suspended(pfdev->base.dev);
@@ -1027,6 +1028,7 @@ static void panfrost_remove(struct platform_device *pdev)
 	panfrost_gem_shrinker_cleanup(&pfdev->base);
 
 	pm_runtime_get_sync(pfdev->base.dev);
+	pm_runtime_dont_use_autosuspend(pfdev->base.dev);
 	pm_runtime_disable(pfdev->base.dev);
 	panfrost_device_fini(pfdev);
 	pm_runtime_set_suspended(pfdev->base.dev);
-- 
2.47.3

Re: [PATCH] drm/panfrost: add missing pm_runtime_dont_use_autosuspend() calls

[Johan Hovold]

On Wed, Sep 16, 2026 at 07:50:51AM +0000, Joshua Crofts wrote:
> panfrost_remove() and panfrost_probe() disable PM runtime on teardown or
> failure but don't call the pm_runtime_dont_use_autosuspend() function,
> causing potential resource leaks.

No, as I've explained repeatedly elsewhere, it does not cause any
resource leaks. [1][2]

The autosuspend setting leaks if you will, but that only matters in the
theoretical corner case of someone rebinding a different driver (which
will soon also taint the kernel).

So don't exaggerate the impact, this is essentially just a cleanup,
which is fine in itself.

> Add the missing function calls.
> 
> Found using Coccinelle.
> 
> Fixes: 5c0c825ae4c6 ("drm/panfrost: Replace DRM driver allocation method with newer one")
> Cc: <stable@vger.kernel.org>

And it does not need to be backported.

> Signed-off-by: Joshua Crofts <joshua.crofts1@gmail.com>

Johan

[1] https://lore.kernel.org/all/aqpd3viN1UoZBkgL@hovoldconsulting.com/
[2] https://lore.kernel.org/linux-iio/aow51Nk-cet9qaUQ@hovoldconsulting.com/