linux-kernel - Re: [PATCH] drm/panfrost: Fix module unload

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Date:   Tue, 3 Nov 2020 09:45:02 +0100
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Steven Price <steven.price@....com>
Cc:     Daniel Vetter <daniel@...ll.ch>, David Airlie <airlied@...ux.ie>,
        Rob Herring <robh@...nel.org>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/panfrost: Fix module unload

On Fri, 30 Oct 2020 14:58:33 +0000
Steven Price <steven.price@....com> wrote:

> When unloading the call to pm_runtime_put_sync_suspend() will attempt to
> turn the GPU cores off, however panfrost_device_fini() will have turned
> the clocks off. This leads to the hardware locking up.
> 
> Instead don't call pm_runtime_put_sync_suspend() and instead simply mark
> the device as suspended using pm_runtime_set_suspended(). And also
> include this on the error path in panfrost_probe().
> 
> Fixes: aebe8c22a912 ("drm/panfrost: Fix possible suspend in panfrost_remove")
> Signed-off-by: Steven Price <steven.price@....com>

Queued to drm-misc-fixes.

Thanks,

Boris

> ---
>  drivers/gpu/drm/panfrost/panfrost_drv.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
> index 23513869500c..0ac8ad18fdc6 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_drv.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
> @@ -627,6 +627,7 @@ static int panfrost_probe(struct platform_device *pdev)
>  err_out1:
>  	pm_runtime_disable(pfdev->dev);
>  	panfrost_device_fini(pfdev);
> +	pm_runtime_set_suspended(pfdev->dev);
>  err_out0:
>  	drm_dev_put(ddev);
>  	return err;
> @@ -641,9 +642,9 @@ static int panfrost_remove(struct platform_device *pdev)
>  	panfrost_gem_shrinker_cleanup(ddev);
>  
>  	pm_runtime_get_sync(pfdev->dev);
> -	panfrost_device_fini(pfdev);
> -	pm_runtime_put_sync_suspend(pfdev->dev);
>  	pm_runtime_disable(pfdev->dev);
> +	panfrost_device_fini(pfdev);
> +	pm_runtime_set_suspended(pfdev->dev);
>  
>  	drm_dev_put(ddev);
>  	return 0;