linux-kernel - [PATCH v2 2/5] drm/modes: Extract drm_mode_parse_cmdline_named

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Message-Id: <1371554419ae63cb54c2a377db0c1016fcf200bb.1657788997.git.geert@linux-m68k.org>
Date:   Thu, 14 Jul 2022 11:04:07 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Hans de Goede <hdegoede@...hat.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-m68k@...r.kernel.org, linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH v2 2/5] drm/modes: Extract drm_mode_parse_cmdline_named_mode()

Extract the code to check for a named mode parameter into its own
function, to streamline the main parsing flow.

Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Acked-by: Thomas Zimmermann <tzimmermann@...e.de>
---
v2:
  - Add Reviewed-by, Acked-by,
  - Fix length check.
---
 drivers/gpu/drm/drm_modes.c | 40 +++++++++++++++++++++++++++----------
 1 file changed, 29 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index 67773740c74c9ba0..a3df18fccb31fa77 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -1749,6 +1749,29 @@ static const char * const drm_named_modes_whitelist[] = {
 	"PAL",
 };
 
+static int drm_mode_parse_cmdline_named_mode(const char *name,
+					     unsigned int length, bool refresh,
+					     struct drm_cmdline_mode *mode)
+{
+	unsigned int i;
+	int ret;
+
+	for (i = 0; i < ARRAY_SIZE(drm_named_modes_whitelist); i++) {
+		ret = str_has_prefix(name, drm_named_modes_whitelist[i]);
+		if (ret != length)
+			continue;
+
+		if (refresh)
+			return -EINVAL; /* named + refresh is invalid */
+
+		strcpy(mode->name, drm_named_modes_whitelist[i]);
+		mode->specified = true;
+		return 0;
+	}
+
+	return 0;
+}
+
 /**
  * drm_mode_parse_command_line_for_connector - parse command line modeline for connector
  * @mode_option: optional per connector mode option
@@ -1785,7 +1808,7 @@ bool drm_mode_parse_command_line_for_connector(const char *mode_option,
 	const char *bpp_ptr = NULL, *refresh_ptr = NULL, *extra_ptr = NULL;
 	const char *options_ptr = NULL;
 	char *bpp_end_ptr = NULL, *refresh_end_ptr = NULL;
-	int i, len, ret;
+	int len, ret;
 
 	memset(mode, 0, sizeof(*mode));
 	mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
@@ -1823,16 +1846,11 @@ bool drm_mode_parse_command_line_for_connector(const char *mode_option,
 	}
 
 	/* First check for a named mode */
-	for (i = 0; mode_end && i < ARRAY_SIZE(drm_named_modes_whitelist); i++) {
-		ret = str_has_prefix(name, drm_named_modes_whitelist[i]);
-		if (ret == mode_end) {
-			if (refresh_ptr)
-				return false; /* named + refresh is invalid */
-
-			strcpy(mode->name, drm_named_modes_whitelist[i]);
-			mode->specified = true;
-			break;
-		}
+	if (mode_end) {
+		ret = drm_mode_parse_cmdline_named_mode(name, mode_end,
+							refresh_ptr, mode);
+		if (ret)
+			return false;
 	}
 
 	/* No named mode? Check for a normal mode argument, e.g. 1024x768 */
-- 
2.25.1