linux-kernel - [PATCH v1 07/35] drm/modes: Only consider bpp and refresh before options

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Date:   Fri, 29 Jul 2022 18:34:50 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Jernej Skrabec <jernej.skrabec@...il.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Jerome Brunet <jbrunet@...libre.com>,
        Samuel Holland <samuel@...lland.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Daniel Vetter <daniel@...ll.ch>, Emma Anholt <emma@...olt.net>,
        David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Noralf Trønnes <noralf@...nnes.org>,
        Kevin Hilman <khilman@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Maxime Ripard <mripard@...nel.org>
Cc:     Maxime Ripard <maxime@...no.tech>, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org, Phil Elwell <phil@...pberrypi.com>,
        Mateusz Kwiatkowski <kfyatek+publicgit@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        linux-amlogic@...ts.infradead.org, dri-devel@...ts.freedesktop.org,
        Dom Cobley <dom@...pberrypi.com>
Subject: [PATCH v1 07/35] drm/modes: Only consider bpp and refresh before options

Some video= options might have a value that contains a dash. However, the
command line parsing mode considers all dashes as the separator between the
mode and the bpp count.

Let's rework the parsing code a bit to only consider a dash as the bpp
separator if it before a comma, the options separator.

A follow-up patch will add a unit-test for this once such an option is
introduced.

Signed-off-by: Maxime Ripard <maxime@...no.tech>

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index a4c1bd688338..06a006e0b2e3 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -1819,20 +1819,22 @@ bool drm_mode_parse_command_line_for_connector(const char *mode_option,
 
 	name = mode_option;
 
+	/* Locate the start of named options */
+	options_ptr = strchr(name, ',');
+	if (options_ptr)
+		options_off = options_ptr - name;
+	else
+		options_off = strlen(name);
+
 	/* Try to locate the bpp and refresh specifiers, if any */
-	bpp_ptr = strchr(name, '-');
+	bpp_ptr = strnchr(name, options_off, '-');
 	if (bpp_ptr)
 		bpp_off = bpp_ptr - name;
 
-	refresh_ptr = strchr(name, '@');
+	refresh_ptr = strnchr(name, options_off, '@');
 	if (refresh_ptr)
 		refresh_off = refresh_ptr - name;
 
-	/* Locate the start of named options */
-	options_ptr = strchr(name, ',');
-	if (options_ptr)
-		options_off = options_ptr - name;
-
 	/* Locate the end of the name / resolution, and parse it */
 	if (bpp_ptr) {
 		mode_end = bpp_off;

-- 
b4 0.10.0-dev-49460