[PATCH 1/5] drm/modes: parse_cmdline: Handle empty mode name part

[Geert Uytterhoeven]

If no mode name part was specified, mode_end is zero, and the "ret ==
mode_end" check does the wrong thing.

Fix this by checking for a non-zero return value instead.
While at it, skip all named mode handling when mode_end is zero, as it
is futile.

Fixes: 7b1cce760afe38b4 ("drm/modes: parse_cmdline: Allow specifying 
stand-alone options")
Signed-off-by: Geert Uytterhoeven <ge...@linux-m68k.org>
---
 drivers/gpu/drm/drm_modes.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index 14b746f7ba975954..30a7be97707bfb16 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -1823,9 +1823,9 @@ bool drm_mode_parse_command_line_for_connector(const char 
*mode_option,
        }
 
        /* First check for a named mode */
-       for (i = 0; i < ARRAY_SIZE(drm_named_modes_whitelist); i++) {
+       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 (ret) {
                        if (refresh_ptr)
                                return false; /* named + refresh is invalid */
 
-- 
2.25.1