linux-kernel - Re: [PATCH v1] drm: Switch drm_client_buffer_delete() to unlocked drm_gem

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Message-ID: <a609cff3-b3db-1f17-832f-99652356e74e@amd.com>
Date:   Mon, 24 Oct 2022 12:56:24 +0200
From:   Christian König <christian.koenig@....com>
To:     Dmitry Osipenko <dmitry.osipenko@...labora.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] drm: Switch drm_client_buffer_delete() to unlocked
 drm_gem_vunmap



Am 20.10.22 um 23:33 schrieb Dmitry Osipenko:
> The drm_client_buffer_delete() wasn't switched to unlocked GEM vunmapping
> by accident when rest of drm_client code transitioned to the unlocked
> variants of the vmapping functions. Make drm_client_buffer_delete() use
> the unlocked variant. This fixes lockdep warning splat about missing
> reservation lock when framebuffer is released.
>
> Reported-by: kernel test robot <yujie.liu@...el.com>
> Link: https://lore.kernel.org/dri-devel/890f70db-68b0-8456-ca3c-c5496ef90517@collabora.com/T/
> Fixes: 79e2cf2e7a19 ("drm/gem: Take reservation lock for vmap/vunmap operations")
> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>

The code was properly added recently between review and pushing. Let's 
get that upstream ASAP.

Acked-by: Christian König <christian.koenig@....com>

> ---
>   drivers/gpu/drm/drm_client.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_client.c b/drivers/gpu/drm/drm_client.c
> index fbcb1e995384..38e1be991caa 100644
> --- a/drivers/gpu/drm/drm_client.c
> +++ b/drivers/gpu/drm/drm_client.c
> @@ -235,7 +235,7 @@ static void drm_client_buffer_delete(struct drm_client_buffer *buffer)
>   {
>   	struct drm_device *dev = buffer->client->dev;
>   
> -	drm_gem_vunmap(buffer->gem, &buffer->map);
> +	drm_gem_vunmap_unlocked(buffer->gem, &buffer->map);
>   
>   	if (buffer->gem)
>   		drm_gem_object_put(buffer->gem);