From: Maxime Ripard <maxime@cerno.tech>
To: Danilo Krummrich <dakr@redhat.com>
Cc: airlied@linux.ie, dri-devel@lists.freedesktop.org,
tzimmermann@suse.de, linux-kernel@vger.kernel.org
Subject: Re: [PATCH drm-misc-next 2/3] drm/vc4: plane: protect device resources after removal
Date: Fri, 19 Aug 2022 09:26:14 +0200 [thread overview]
Message-ID: <20220819072614.dthfuugbkk65o3ps@houat> (raw)
In-Reply-To: <20220819002905.82095-3-dakr@redhat.com>
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Hi,
On Fri, Aug 19, 2022 at 02:29:04AM +0200, Danilo Krummrich wrote:
> (Hardware) resources which are bound to the driver and device lifecycle
> must not be accessed after the device and driver are unbound.
>
> However, the DRM device isn't freed as long as the last user closed it,
> hence userspace can still call into the driver.
>
> Therefore protect the critical sections which are accessing those
> resources with drm_dev_enter() and drm_dev_exit().
Ah good catch, thanks
> Fixes: 9872c7a31921 ("drm/vc4: plane: Switch to drmm_universal_plane_alloc()")
> Signed-off-by: Danilo Krummrich <dakr@redhat.com>
> ---
> drivers/gpu/drm/vc4/vc4_drv.h | 1 +
> drivers/gpu/drm/vc4/vc4_plane.c | 25 +++++++++++++++++++++++++
> 2 files changed, 26 insertions(+)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
> index 418a8242691f..80da9a9337cc 100644
> --- a/drivers/gpu/drm/vc4/vc4_drv.h
> +++ b/drivers/gpu/drm/vc4/vc4_drv.h
> @@ -341,6 +341,7 @@ struct vc4_hvs {
>
> struct vc4_plane {
> struct drm_plane base;
> + struct drm_device *dev;
That pointer already exists in struct drm_plane
Looks good otherwise
Maxime
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next prev parent reply other threads:[~2022-08-19 7:26 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-19 0:29 [PATCH drm-misc-next 0/3] Fixes for vc4 hotplug rework Danilo Krummrich
2022-08-19 0:29 ` [PATCH drm-misc-next 1/3] drm/vc4: hdmi: unlock mutex when device is unplugged Danilo Krummrich
2022-08-19 0:29 ` [PATCH drm-misc-next 2/3] drm/vc4: plane: protect device resources after removal Danilo Krummrich
2022-08-19 7:26 ` Maxime Ripard [this message]
2022-08-19 11:11 ` Danilo Krummrich
2022-08-19 0:29 ` [PATCH drm-misc-next 3/3] drm/vc4: crtc: " Danilo Krummrich
2022-08-19 7:29 ` Maxime Ripard
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