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drm/amdgpu: Add smu lock around in pp_smu_i2c_bus_access

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Protect from concurrent SMU accesses.

Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Reviewed-by: Tao Zhou <tao.zhou1@amd.com>
Reviewed-and-tested-by: Guchun Chen <guchun.chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Andrey Grodzovsky 2019-09-03 16:47:40 -04:00 committed by Alex Deucher
parent f79e06bd44
commit 1963b7c3be
1 changed files with 6 additions and 1 deletions
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7
drivers/gpu/drm/amd/powerplay/amd_powerplay.c
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@ -1531,6 +1531,7 @@ static int pp_asic_reset_mode_2(void *handle)
static int pp_smu_i2c_bus_access(void *handle, bool acquire)
{
struct pp_hwmgr *hwmgr = handle;
int ret = 0;
if (!hwmgr || !hwmgr->pm_en)
return -EINVAL;
@ -1540,7 +1541,11 @@ static int pp_smu_i2c_bus_access(void *handle, bool acquire)
return -EINVAL;
}
return hwmgr->hwmgr_func->smu_i2c_bus_access(hwmgr, acquire);
mutex_lock(&hwmgr->smu_lock);
ret = hwmgr->hwmgr_func->smu_i2c_bus_access(hwmgr, acquire);
mutex_unlock(&hwmgr->smu_lock);
return ret;
}
static const struct amd_pm_funcs pp_dpm_funcs = {