From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Javier Martinez Canillas <javierm@redhat.com>
Cc: linux-kernel@vger.kernel.org,
Thomas Zimmermann <tzimmermann@suse.de>,
Maxime Ripard <mripard@kernel.org>,
Daniel Vetter <daniel@ffwll.ch>, David Airlie <airlied@gmail.com>,
dri-devel@lists.freedesktop.org
Subject: Re: [PATCH v2 4/5] drm/ssd130x: Don't allocate buffers on each plane update
Date: Thu, 13 Jul 2023 14:44:15 +0200 [thread overview]
Message-ID: <CAMuHMdVXhi52KfpCmnum+9t74UWP+AOLE95xQU6VV6Nz=VHk1Q@mail.gmail.com> (raw)
In-Reply-To: <20230609170941.1150941-5-javierm@redhat.com>
Hi Javier,
On Fri, Jun 9, 2023 at 7:09 PM Javier Martinez Canillas
<javierm@redhat.com> wrote:
> The resolutions for these panels are fixed and defined in the Device Tree,
> so there's no point to allocate the buffers on each plane update and that
> can just be done once.
>
> Let's do the allocation and free on the encoder enable and disable helpers
> since that's where others initialization and teardown operations are done.
>
> Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
> Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
> ---
>
> (no changes since v1)
Thanks for your patch, which is now commit 49d7d581ceaf4cf8
("drm/ssd130x: Don't allocate buffers on each plane update") in
drm-misc/for-linux-next.
> --- a/drivers/gpu/drm/solomon/ssd130x.c
> +++ b/drivers/gpu/drm/solomon/ssd130x.c
> @@ -701,14 +709,22 @@ static void ssd130x_encoder_helper_atomic_enable(struct drm_encoder *encoder,
> return;
>
> ret = ssd130x_init(ssd130x);
> - if (ret) {
> - ssd130x_power_off(ssd130x);
> - return;
> - }
> + if (ret)
> + goto power_off;
> +
> + ret = ssd130x_buf_alloc(ssd130x);
This appears to be too late, causing a NULL pointer dereference:
[ 59.302761] [<c0303d90>] ssd130x_update_rect.isra.0+0x13c/0x340
[ 59.304231] [<c0304200>]
ssd130x_primary_plane_helper_atomic_update+0x26c/0x284
[ 59.305716] [<c02f8d54>] drm_atomic_helper_commit_planes+0xfc/0x27c
Bailing out from ssd130x_update_rect() when data_array is still NULL
fixes that.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
next prev parent reply other threads:[~2023-07-13 12:44 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-09 17:09 [PATCH v2 0/5] drm/ssd130x: A few enhancements and cleanups Javier Martinez Canillas
2023-06-09 17:09 ` [PATCH v2 1/5] drm/ssd130x: Make default width and height to be controller dependent Javier Martinez Canillas
2023-06-09 17:09 ` [PATCH v2 2/5] dt-bindings: display: ssd1307fb: Remove default width and height values Javier Martinez Canillas
2023-06-10 15:10 ` Conor Dooley
2023-06-10 17:51 ` Javier Martinez Canillas
2023-06-10 18:14 ` Conor Dooley
2023-06-10 23:18 ` Javier Martinez Canillas
2023-06-12 7:47 ` Thomas Zimmermann
2023-06-12 17:44 ` Conor Dooley
2023-06-12 18:30 ` Javier Martinez Canillas
2023-06-09 17:09 ` [PATCH v2 3/5] drm/ssd130x: Set the page height value in the device info data Javier Martinez Canillas
2023-06-09 17:09 ` [PATCH v2 4/5] drm/ssd130x: Don't allocate buffers on each plane update Javier Martinez Canillas
2023-07-13 12:44 ` Geert Uytterhoeven [this message]
2023-07-13 13:15 ` Javier Martinez Canillas
2023-07-13 13:25 ` Geert Uytterhoeven
2023-07-13 14:12 ` Javier Martinez Canillas
2023-07-13 14:53 ` Geert Uytterhoeven
2023-07-13 16:34 ` Javier Martinez Canillas
2023-06-09 17:09 ` [PATCH v2 5/5] drm/ssd130x: Remove hardcoded bits-per-pixel in ssd130x_buf_alloc() Javier Martinez Canillas
2023-07-12 10:24 ` Geert Uytterhoeven
2023-06-15 21:53 ` [PATCH v2 0/5] drm/ssd130x: A few enhancements and cleanups Javier Martinez Canillas
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