diff options
| author | Tomas Bzatek <tomas@bzatek.net> | 2016-05-01 15:02:45 +0200 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2016-05-23 11:34:48 +1000 |
| commit | 3a4a2ea39f86c581054794c0a727597745f1084b (patch) | |
| tree | e58bb608d95b54b3b2b0af04925677564c241cb4 /drivers/gpu | |
| parent | 5e546cd5b3bc76824069ffa98c52a5f48cf91aba (diff) | |
| download | linux-3a4a2ea39f86c581054794c0a727597745f1084b.tar.bz2 | |
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 <tomas@bzatek.net>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/drm_edid.c | 32 |
1 files 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; } |