From: Maxime Ripard <maxime@cerno.tech>
To: "Noralf Trønnes" <noralf@tronnes.org>
Cc: Karol Herbst <kherbst@redhat.com>,
Jani Nikula <jani.nikula@linux.intel.com>,
Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>,
Daniel Vetter <daniel@ffwll.ch>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
David Airlie <airlied@linux.ie>,
Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
Lyude Paul <lyude@redhat.com>, Emma Anholt <emma@anholt.net>,
Chen-Yu Tsai <wens@csie.org>,
Samuel Holland <samuel@sholland.org>,
Ben Skeggs <bskeggs@redhat.com>,
Thomas Zimmermann <tzimmermann@suse.de>,
Rodrigo Vivi <rodrigo.vivi@intel.com>,
Jernej Skrabec <jernej.skrabec@gmail.com>,
Dom Cobley <dom@raspberrypi.com>,
linux-sunxi@lists.linux.dev,
Dave Stevenson <dave.stevenson@raspberrypi.com>,
intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org,
nouveau@lists.freedesktop.org,
Geert Uytterhoeven <geert@linux-m68k.org>,
linux-arm-kernel@lists.infradead.org,
Mateusz Kwiatkowski <kfyatek+publicgit@gmail.com>,
dri-devel@lists.freedesktop.org,
Hans de Goede <hdegoede@redhat.com>,
Phil Elwell <phil@raspberrypi.com>
Subject: Re: [PATCH v5 12/22] drm/connector: Add a function to lookup a TV mode by its name
Date: Wed, 19 Oct 2022 10:48:28 +0200 [thread overview]
Message-ID: <20221019084828.muy46td63bkyewxk@houat> (raw)
In-Reply-To: <e3b98674-5a9e-16f3-4741-ffea43e05cc8@tronnes.org>
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On Tue, Oct 18, 2022 at 02:29:00PM +0200, Noralf Trønnes wrote:
>
>
> Den 18.10.2022 11.33, skrev Maxime Ripard:
> > On Mon, Oct 17, 2022 at 12:44:45PM +0200, Noralf Trønnes wrote:
> >> Den 13.10.2022 15.18, skrev Maxime Ripard:
> >>> As part of the command line parsing rework coming in the next patches,
> >>> we'll need to lookup drm_connector_tv_mode values by their name, already
> >>> defined in drm_tv_mode_enum_list.
> >>>
> >>> In order to avoid any code duplication, let's do a function that will
> >>> perform a lookup of a TV mode name and return its value.
> >>>
> >>> Signed-off-by: Maxime Ripard <maxime@cerno.tech>
> >>> ---
> >>> drivers/gpu/drm/drm_connector.c | 24 ++++++++++++++++++++++++
> >>> include/drm/drm_connector.h | 2 ++
> >>> 2 files changed, 26 insertions(+)
> >>>
> >>> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> >>> index 820f4c730b38..30611c616435 100644
> >>> --- a/drivers/gpu/drm/drm_connector.c
> >>> +++ b/drivers/gpu/drm/drm_connector.c
> >>> @@ -991,6 +991,30 @@ static const struct drm_prop_enum_list drm_tv_mode_enum_list[] = {
> >>> };
> >>> DRM_ENUM_NAME_FN(drm_get_tv_mode_name, drm_tv_mode_enum_list)
> >>>
> >>> +/**
> >>> + * drm_get_tv_mode_from_name - Translates a TV mode name into its enum value
> >>> + * @name: TV Mode name we want to convert
> >>> + * @len: Length of @name
> >>> + *
> >>> + * Translates @name into an enum drm_connector_tv_mode.
> >>> + *
> >>> + * Returns: the enum value on success, a negative errno otherwise.
> >>> + */
> >>> +int drm_get_tv_mode_from_name(const char *name, size_t len)
> >>
> >> Do we really need to pass in length here? item->name has to always be
> >> NUL terminated otherwise things would break elsewhere, so it shouldn't
> >> be necessary AFAICS.
> >
> > The only user so far is the command-line parsing code, and we might very
> > well have an option after the tv_mode, something like
> > 720x480i,tv_mode=NTSC,rotate=180
> >
> > In this case, we won't get a NULL-terminated name.
>
> My point is that item->name will always be NUL terminated so strcmp()
> will never look past that.
Right, but we don't have the guarantee that strlen(item->name) <
strlen(name), and we could thus just access after the end of our name
Maxime
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next prev parent reply other threads:[~2022-10-19 8:49 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-13 13:18 [PATCH v5 00/22] drm: Analog TV Improvements Maxime Ripard
2022-10-13 13:18 ` [PATCH v5 01/22] drm/tests: Add Kunit Helpers Maxime Ripard
2022-10-15 15:06 ` Noralf Trønnes
2022-10-13 13:18 ` [PATCH v5 02/22] drm/connector: Rename legacy TV property Maxime Ripard
2022-10-13 13:18 ` [PATCH v5 03/22] drm/connector: Only register TV mode property if present Maxime Ripard
2022-10-13 13:18 ` [PATCH v5 04/22] drm/connector: Rename drm_mode_create_tv_properties Maxime Ripard
2022-10-13 13:18 ` [PATCH v5 05/22] drm/connector: Add TV standard property Maxime Ripard
2022-10-13 13:18 ` [PATCH v5 06/22] drm/modes: Add a function to generate analog display modes Maxime Ripard
2022-10-16 17:34 ` Mateusz Kwiatkowski
2022-10-18 8:08 ` Maxime Ripard
2022-10-13 13:18 ` [PATCH v5 07/22] drm/client: Add some tests for drm_connector_pick_cmdline_mode() Maxime Ripard
2022-10-15 16:58 ` Noralf Trønnes
2022-10-20 7:55 ` Michał Winiarski
2022-10-13 13:18 ` [PATCH v5 08/22] drm/modes: Move named modes parsing to a separate function Maxime Ripard
2022-10-16 16:11 ` Noralf Trønnes
2022-10-18 7:57 ` Maxime Ripard
2022-10-13 13:18 ` [PATCH v5 09/22] drm/modes: Switch to named mode descriptors Maxime Ripard
2022-10-13 13:18 ` [PATCH v5 10/22] drm/modes: Fill drm_cmdline mode from named modes Maxime Ripard
2022-10-13 13:18 ` [PATCH v5 11/22] drm/connector: Add pixel clock to cmdline mode Maxime Ripard
2022-10-13 13:18 ` [PATCH v5 12/22] drm/connector: Add a function to lookup a TV mode by its name Maxime Ripard
2022-10-17 10:44 ` Noralf Trønnes
2022-10-18 9:33 ` Maxime Ripard
2022-10-18 12:29 ` Noralf Trønnes
2022-10-19 8:48 ` Maxime Ripard [this message]
2022-10-19 10:43 ` Noralf Trønnes
2022-10-20 11:29 ` maxime
2022-10-13 13:18 ` [PATCH v5 13/22] drm/modes: Introduce the tv_mode property as a command-line option Maxime Ripard
2022-10-16 17:51 ` Mateusz Kwiatkowski
2022-10-17 10:21 ` Noralf Trønnes
2022-10-13 13:18 ` [PATCH v5 14/22] drm/modes: Properly generate a drm_display_mode from a named mode Maxime Ripard
2022-10-13 13:18 ` [PATCH v5 15/22] drm/modes: Introduce more named modes Maxime Ripard
2022-10-13 13:19 ` [PATCH v5 16/22] drm/atomic-helper: Add a TV properties reset helper Maxime Ripard
2022-10-17 10:36 ` Noralf Trønnes
2022-10-13 13:19 ` [PATCH v5 17/22] drm/atomic-helper: Add an analog TV atomic_check implementation Maxime Ripard
2022-10-13 13:19 ` [PATCH v5 18/22] drm/vc4: vec: Use TV Reset implementation Maxime Ripard
2022-10-13 13:19 ` [PATCH v5 19/22] drm/vc4: vec: Check for VEC output constraints Maxime Ripard
2022-10-16 18:12 ` Mateusz Kwiatkowski
2022-10-16 18:16 ` Mateusz Kwiatkowski
2022-10-18 8:27 ` Maxime Ripard
2022-10-13 13:19 ` [PATCH v5 20/22] drm/vc4: vec: Convert to the new TV mode property Maxime Ripard
2022-10-16 18:52 ` Mateusz Kwiatkowski
2022-10-16 18:56 ` Mateusz Kwiatkowski
2022-10-17 10:31 ` Noralf Trønnes
2022-10-18 10:00 ` Maxime Ripard
[not found] ` <da2b4cb4-5d12-3161-64e3-e87a8cc63e81@gmail.com>
2022-10-20 11:58 ` maxime
2022-10-17 11:39 ` Noralf Trønnes
2022-10-13 13:19 ` [PATCH v5 21/22] drm/vc4: vec: Add support for more analog TV standards Maxime Ripard
2022-10-16 19:02 ` Mateusz Kwiatkowski
2022-10-16 19:46 ` [PATCH] drm/vc4: vec: Add support for PAL-60 Mateusz Kwiatkowski
2022-10-18 8:31 ` Maxime Ripard
2022-10-18 20:57 ` Mateusz Kwiatkowski
2022-10-20 15:34 ` maxime
2022-10-13 13:19 ` [PATCH v5 22/22] drm/sun4i: tv: Convert to the new TV mode property Maxime Ripard
2022-10-13 18:23 ` Jernej Škrabec
2022-10-14 7:38 ` Maxime Ripard
2022-10-15 8:59 ` Jernej Škrabec
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