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drm/amd/display: guard for virtual calling destroy_link_encoders

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[Why]:
On power down, virtual dal may try to delete link_encoders by
referencing uninitialized res_pool.

[How]:
Added guard against empty res_pool.

Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Martin Leung <martin.leung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Martin Leung 2021-02-19 18:04:42 -05:00 committed by Alex Deucher
parent 82a562ab5f
commit e73b386e75
1 changed files with 8 additions and 2 deletions
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10
drivers/gpu/drm/amd/display/dc/core/dc.c
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@ -347,10 +347,16 @@ static bool create_link_encoders(struct dc *dc)
*/
static void destroy_link_encoders(struct dc *dc)
{
unsigned int num_usb4_dpia = dc->res_pool->res_cap->num_usb4_dpia;
unsigned int num_dig_link_enc = dc->res_pool->res_cap->num_dig_link_enc;
unsigned int num_usb4_dpia;
unsigned int num_dig_link_enc;
int i;
if (!dc->res_pool)
return;
num_usb4_dpia = dc->res_pool->res_cap->num_usb4_dpia;
num_dig_link_enc = dc->res_pool->res_cap->num_dig_link_enc;
/* A platform without USB4 DPIA endpoints has a fixed mapping between DIG
* link encoders and physical display endpoints and does not require
* additional link encoder objects.