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drm/amd/display: fix a NULL pointer dereference in amdgpu_dm_i2c_xfer() 

When ddc_service_construct() is called, it explicitly checks both the
link type and whether there is something on the link which will
dictate whether the pin is marked as hw_supported.

If the pin isn't set or the link is not set (such as from
unloading/reloading amdgpu in an IGT test) then fail the
amdgpu_dm_i2c_xfer() call.

Cc: stable@vger.kernel.org
Fixes: 22676bc500 ("drm/amd/display: Fix dmub soft hang for PSR 1")
Link: https://github.com/fwupd/fwupd/issues/6327
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Mario Limonciello 2023-11-08 13:31:57 -06:00 committed by Alex Deucher
parent 9725a4f9eb
commit b71f4ade1b
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@ -7481,6 +7481,9 @@ static int amdgpu_dm_i2c_xfer(struct i2c_adapter *i2c_adap,
int i;
int result = -EIO;
if (!ddc_service->ddc_pin || !ddc_service->ddc_pin->hw_info.hw_supported)
return result;
cmd.payloads = kcalloc(num, sizeof(struct i2c_payload), GFP_KERNEL);
if (!cmd.payloads)