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drm/displayid: allow data blocks with 0 payload length

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The DisplayID specifications explicitly call out 0 as a valid payload
length for data blocks. The mere presence of a data block, or the
information coded in the block specific data (bits 7:3 in offset 1), may
be enough to convey the necessary information.

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/d562dff99ba7c92accb654a99b433bed471e8507.1617024940.git.jani.nikula@intel.com
This commit is contained in:
Jani Nikula 2021-03-29 16:37:21 +03:00
parent bfd4e1929b
commit f72b1437e9
1 changed files with 1 additions and 2 deletions
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3
drivers/gpu/drm/drm_displayid.c
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@ -77,8 +77,7 @@ displayid_iter_block(const struct displayid_iter *iter)
block = (const struct displayid_block *)&iter->section[iter->idx];
if (iter->idx + sizeof(*block) <= iter->length &&
iter->idx + sizeof(*block) + block->num_bytes <= iter->length &&
block->num_bytes > 0)
iter->idx + sizeof(*block) + block->num_bytes <= iter->length)
return block;
return NULL;