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drm/i915/display: Fix possible overflow on tc power domain selection

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There is a possibility that intel_encoder_to_tc() function
returns negative i.e. TC_PORT_NONE (-1) value which may cause
tc_port_power_domain() function to overflow. To fix this,
let's add additional check that returns invalid power domain
i.e. POWER_DOMAIN_INVALID in case tc port equals TC_PORT_NONE.

Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Link: https://lore.kernel.org/r/20250829101226.4085757-1-mika.kahola@intel.com
This commit is contained in:
Mika Kahola 2025-08-29 13:12:26 +03:00
parent 5f9bab8081
commit 765531faa4
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/display/intel_tc.c
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@ -249,6 +249,9 @@ tc_port_power_domain(struct intel_tc_port *tc)
{
enum tc_port tc_port = intel_encoder_to_tc(&tc->dig_port->base);
if (tc_port == TC_PORT_NONE)
return POWER_DOMAIN_INVALID;
return POWER_DOMAIN_PORT_DDI_LANES_TC1 + tc_port - TC_PORT_1;
}