From 3a4a2ea39f86c581054794c0a727597745f1084b Mon Sep 17 00:00:00 2001 From: Tomas Bzatek Date: Sun, 1 May 2016 15:02:45 +0200 Subject: [PATCH] drm/displayid: Iterate over all DisplayID blocks This will iterate over all DisplayID blocks found in the buffer. Previously only the first block was parsed. https://bugs.freedesktop.org/show_bug.cgi?id=95207 Signed-off-by: Tomas Bzatek Reviewed-by: Jani Nikula Signed-off-by: Dave Airlie --- drivers/gpu/drm/drm_edid.c | 32 +++++++++++++++++++------------- 1 file changed, 19 insertions(+), 13 deletions(-) diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 4724596ebf53..0b95a7f2db03 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -4237,19 +4237,25 @@ static int drm_parse_display_id(struct drm_connector *connector, return -EINVAL; } - block = (struct displayid_block *)&displayid[idx + 4]; - DRM_DEBUG_KMS("block id %d, rev %d, len %d\n", - block->tag, block->rev, block->num_bytes); - - switch (block->tag) { - case DATA_BLOCK_TILED_DISPLAY: - ret = drm_parse_tiled_block(connector, block); - if (ret) - return ret; - break; - default: - printk("unknown displayid tag %d\n", block->tag); - break; + idx += sizeof(struct displayid_hdr); + while (block = (struct displayid_block *)&displayid[idx], + idx + sizeof(struct displayid_block) <= length && + idx + sizeof(struct displayid_block) + block->num_bytes <= length && + block->num_bytes > 0) { + idx += block->num_bytes + sizeof(struct displayid_block); + DRM_DEBUG_KMS("block id 0x%x, rev %d, len %d\n", + block->tag, block->rev, block->num_bytes); + + switch (block->tag) { + case DATA_BLOCK_TILED_DISPLAY: + ret = drm_parse_tiled_block(connector, block); + if (ret) + return ret; + break; + default: + DRM_DEBUG_KMS("found DisplayID tag 0x%x, unhandled\n", block->tag); + break; + } } return 0; } -- 2.39.2