Hello Samson Tam,
This is a semi-automatic email about new static checker warnings.
The patch 66acd4418d7d: "drm/amd/display: Link train only when link
is DP and backend is enabled" from Mar 4, 2019, leads to the
following Smatch complaint:
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:553
dc_link_set_preferred_link_settings()
warn: variable dereferenced before check 'link_stream' (see line 550)
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c
540 }
541 }
542
543 /* Stream not found */
544 if (i == MAX_PIPES)
545 return;
546
547 link_stream =
link->dc->current_state->res_ctx.pipe_ctx[i].stream;
548
549 /* Cannot retrain link if backend is off */
550 if (link_stream->dpms_off)
^^^^^^^^^^^^^^^^^^^^^
New check
551 return;
552
553 if (link_stream)
^^^^^^^^^^^
The old code used to check for NULL
554 decide_link_settings(link_stream, &store_settings);
555
regards,
dan carpenter
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