From: Sean Paul <seanpaul@chromium.org>
To: Boris Brezillon <boris.brezillon@bootlin.com>
Cc: David Airlie <airlied@linux.ie>, dri-devel@lists.freedesktop.org
Subject: Re: [PATCH] drm/atomic: Initialize variables in drm_atomic_helper_async_check() to make gcc happy
Date: Mon, 23 Jul 2018 10:09:25 -0400 [thread overview]
Message-ID: <20180723140925.GI20359@art_vandelay> (raw)
In-Reply-To: <20180723135902.26037-1-boris.brezillon@bootlin.com>
On Mon, Jul 23, 2018 at 03:59:02PM +0200, Boris Brezillon wrote:
> drm_atomic_helper_async_check() declares the plane, old_plane_state and
> new_plane_state variables to iterate over all planes of the atomic
> state and make sure only one plane is enabled.
>
> Unfortunately gcc is not smart enough to figure out that the check on
> n_planes is enough to guarantee that plane, new_plane_state and
> old_plane_state are initialized.
>
> Explicitly initialized those variables to NULL to make gcc happy.
Reviewed-by: Sean Paul <seanpaul@chromium.org>
>
> Fixes: fef9df8b5945 ("drm/atomic: initial support for asynchronous plane update")
> Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
> ---
> drivers/gpu/drm/drm_atomic_helper.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> index f7ccfebd3ca8..80be74df7ba6 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -1538,8 +1538,9 @@ int drm_atomic_helper_async_check(struct drm_device *dev,
> {
> struct drm_crtc *crtc;
> struct drm_crtc_state *crtc_state;
> - struct drm_plane *plane;
> - struct drm_plane_state *old_plane_state, *new_plane_state;
> + struct drm_plane *plane = NULL;
> + struct drm_plane_state *old_plane_state = NULL;
> + struct drm_plane_state *new_plane_state = NULL;
> const struct drm_plane_helper_funcs *funcs;
> int i, n_planes = 0;
>
> --
> 2.14.1
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Sean Paul, Software Engineer, Google / Chromium OS
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next prev parent reply other threads:[~2018-07-23 14:09 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-23 13:59 [PATCH] drm/atomic: Initialize variables in drm_atomic_helper_async_check() to make gcc happy Boris Brezillon
2018-07-23 14:09 ` Sean Paul [this message]
2018-07-23 14:17 ` Boris Brezillon
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