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References: <20210427094449.14730-1-fmdefrancesco@gmail.com>
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From:   Alex Deucher <alexdeucher@gmail.com>
Date:   Tue, 4 May 2021 15:21:20 -0400
Message-ID: <CADnq5_NGWrsxaxJqE+_y7Lm4Fdx=BkZYAaYWz_VACAVSgV-ivQ@mail.gmail.com>
Subject: Re: [PATCH v4] drm/amd/amdgpu/amdgpu_drv.c: Replace
 drm_modeset_lock_all with drm_modeset_lock
To:     "Fabio M. De Francesco" <fmdefrancesco@gmail.com>
Cc:     outreachy-kernel@googlegroups.com,
        Maling list - DRI developers 
        <dri-devel@lists.freedesktop.org>, shaoyunl <shaoyun.liu@amd.com>,
        Alex Deucher <alexander.deucher@amd.com>,
        =?UTF-8?Q?Christian_K=C3=B6nig?= <christian.koenig@amd.com>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>, Evan Quan <evan.quan@amd.com>,
        Hawking Zhang <Hawking.Zhang@amd.com>,
        Felix Kuehling <Felix.Kuehling@amd.com>,
        Luben Tuikov <luben.tuikov@amd.com>,
        Aurabindo Pillai <aurabindo.pillai@amd.com>,
        amd-gfx list <amd-gfx@lists.freedesktop.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Matthew Wilcox <willy@infradead.org>
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On Tue, Apr 27, 2021 at 5:45 AM Fabio M. De Francesco
<fmdefrancesco@gmail.com> 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@ffwll.ch>
> Suggested-by: Matthew Wilcox <willy@infradead.org>
> Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
> Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>

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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