linux-kernel - Re: [PATCH] drm/virtio: move drm_connector_update_edid

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Message-ID: <20190626095146.2731a2dc.cohuck@redhat.com>
Date:   Wed, 26 Jun 2019 09:51:46 +0200
From:   Cornelia Huck <cohuck@...hat.com>
To:     Gerd Hoffmann <kraxel@...hat.com>
Cc:     dri-devel@...ts.freedesktop.org, jcmvbkbc@...il.com,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        virtualization@...ts.linux-foundation.org (open list:VIRTIO GPU DRIVER),
        linux-kernel@...r.kernel.org (open list)
Subject: Re: [PATCH] drm/virtio: move drm_connector_update_edid_property()
 call

On Fri,  5 Apr 2019 06:46:02 +0200
Gerd Hoffmann <kraxel@...hat.com> wrote:

> drm_connector_update_edid_property can sleep, we must not
> call it while holding a spinlock.  Move the callsize.

s/callsize/callsite/

> 
> Reported-by: Max Filippov <jcmvbkbc@...il.com>
> Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
> ---
>  drivers/gpu/drm/virtio/virtgpu_vq.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
> index e62fe24b1a2e..5bb0f0a084e9 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_vq.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
> @@ -619,11 +619,11 @@ static void virtio_gpu_cmd_get_edid_cb(struct virtio_gpu_device *vgdev,
>  	output = vgdev->outputs + scanout;
>  
>  	new_edid = drm_do_get_edid(&output->conn, virtio_get_edid_block, resp);
> +	drm_connector_update_edid_property(&output->conn, new_edid);
>  
>  	spin_lock(&vgdev->display_info_lock);
>  	old_edid = output->edid;
>  	output->edid = new_edid;
> -	drm_connector_update_edid_property(&output->conn, output->edid);
>  	spin_unlock(&vgdev->display_info_lock);
>  
>  	kfree(old_edid);

This gets rid of the sleeping while atomic traces I've been seeing with
an s390x guest (both virtio-gpu-pci and virtio-gpu-ccw).

Tested-by: Cornelia Huck <cohuck@...hat.com>

I have also looked at the code a bit, but don't feel confident enough
to give an R-b.

Acked-by: Cornelia Huck <cohuck@...hat.com>