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0563d172b6
The function dereferences amdgpu_dm_connector->dc_link early to
initialize verified_link_cap and dc, but later still checks
amdgpu_dm_connector->dc_link for NULL in the analog path.
This late NULL check is redundant, introduce a local dc_link pointer,
use it consistently, and drop the superfluous NULL check while using
dc_link->link_id.id instead.
The function uses dc_link at the very beginning without checking if it
is NULL. But later in the code, it suddenly checks if dc_link is NULL.
This check is too late to be useful, because the code has already used
dc_link earlier. So this NULL check does nothing.
We simplify the code by storing amdgpu_dm_connector->dc_link in a local
dc_link variable and using it throughout the function. Since dc_link is
already dereferenced early, the later NULL check is unnecessary and is
removed.
Fixes the below:
amdgpu_dm_connector_get_modes():
variable dereferenced before check 'amdgpu_dm_connector->dc_link'
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c
8845 &amdgpu_dm_connector->dc_link->verified_link_cap;
8846 const struct dc *dc = amdgpu_dm_connector->dc_link->dc;
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dereference
...
8856
8857 if (amdgpu_dm_connector->dc_sink &&
8858 amdgpu_dm_connector->dc_link &&
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Checked too late.
Presumably this NULL check could be removed?
...
Fixes:
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.