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drm/edid: Don't include ext block csum in DispID size

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The EDID extension block checksum byte is not part of the
actual DispID data, so don't use it in validate_displayid().

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200313162054.16009-8-ville.syrjala@linux.intel.com
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Ville Syrjälä
2020-03-13 18:20:52 +02:00
parent 8e88c75245
commit 5f706b4a3b
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/drm_edid.c
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@@ -3222,7 +3222,8 @@ static u8 *drm_find_displayid_extension(const struct edid *edid,
if (!displayid)
return NULL;
*length = EDID_LENGTH;
/* EDID extensions block checksum isn't for us */
*length = EDID_LENGTH - 1;
*idx = 1;
ret = validate_displayid(displayid, *length, *idx);