Re: [PATCH v4] drm/amd/amdgpu/amdgpu_drv.c: Replace drm_modeset_lock_all with drm_modeset_lock

[Alex Deucher]

On Tue, Apr 27, 2021 at 5:45 AM Fabio M. De Francesco
<fmdefrancesco@xxxxxxxxx> wrote:
>
> drm_modeset_lock_all() is not needed here, so it is replaced with
> drm_modeset_lock(). The crtc list around which we are looping never
> changes, therefore the only lock we need is to protect access to
> crtc->state.
>
> Suggested-by: Daniel Vetter <daniel@xxxxxxxx>
> Suggested-by: Matthew Wilcox <willy@xxxxxxxxxxxxx>
> Signed-off-by: Fabio M. De Francesco <fmdefrancesco@xxxxxxxxx>
> Reviewed-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>

Applied.  Thanks!

Alex


> ---
>
> Changes from v3: CC'ed more (previously missing) maintainers.
> Changes from v2: Drop file name from the Subject. Cc'ed all maintainers.
> Changes from v1: Removed unnecessary braces around single statement
> block.
>
>  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 10 ++++------
>  1 file changed, 4 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> index 80130c1c0c68..39204dbc168b 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> @@ -1595,17 +1595,15 @@ static int amdgpu_pmops_runtime_idle(struct device *dev)
>         if (amdgpu_device_has_dc_support(adev)) {
>                 struct drm_crtc *crtc;
>
> -               drm_modeset_lock_all(drm_dev);
> -
>                 drm_for_each_crtc(crtc, drm_dev) {
> -                       if (crtc->state->active) {
> +                       drm_modeset_lock(&crtc->mutex, NULL);
> +                       if (crtc->state->active)
>                                 ret = -EBUSY;
> +                       drm_modeset_unlock(&crtc->mutex);
> +                       if (ret < 0)
>                                 break;
> -                       }
>                 }
>
> -               drm_modeset_unlock_all(drm_dev);
> -
>         } else {
>                 struct drm_connector *list_connector;
>                 struct drm_connector_list_iter iter;
> --
> 2.31.1
>
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