Commit e73b386e authored by Martin Leung's avatar Martin Leung Committed by Alex Deucher
Browse files

drm/amd/display: guard for virtual calling destroy_link_encoders 



[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: default avatarRodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: default avatarMartin Leung <martin.leung@amd.com>
Tested-by: default avatarDaniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 82a562ab

drivers/gpu/drm/amd/display/dc/core/dc.c

+8 −2
Original line number Diff line number Diff line
@@ -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.