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drm/amd/display: Fix null pointer dereference for encoders

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[ Upstream commit 60f39edd89 ]

[Why]
Links which are dynamically assigned link encoders have their link
encoder set to NULL.

[How]
Check that a pointer to a link_encoder object is non-NULL before using
it.

Reviewed-by: Aric Cyr <aric.cyr@amd.com>
Reviewed-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Jimmy Kizito <Jimmy.Kizito@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jimmy Kizito
2021-09-12 11:21:52 -04:00
committed by Greg Kroah-Hartman
parent 351601af20
commit 678e8cd1bf
2 changed files with 2 additions and 2 deletions
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2
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
View File

@@ -4690,7 +4690,7 @@ enum dc_status dp_set_fec_ready(struct dc_link *link, bool ready)
link_enc->funcs->fec_set_ready(link_enc, true);
link->fec_state = dc_link_fec_ready;
} else {
link_enc->funcs->fec_set_ready(link->link_enc, false);
link_enc->funcs->fec_set_ready(link_enc, false);
link->fec_state = dc_link_fec_not_ready;
dm_error("dpcd write failed to set fec_ready");
}

2
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
View File

@@ -1522,7 +1522,7 @@ void dcn10_power_down_on_boot(struct dc *dc)
for (i = 0; i < dc->link_count; i++) {
struct dc_link *link = dc->links[i];
if (link->link_enc->funcs->is_dig_enabled &&
if (link->link_enc && link->link_enc->funcs->is_dig_enabled &&
link->link_enc->funcs->is_dig_enabled(link->link_enc) &&
dc->hwss.power_down) {
dc->hwss.power_down(dc);