From e6cbabcd70c7e6fd32766eb82baa50362ca9ae89 Mon Sep 17 00:00:00 2001 From: Andrey Grodzovsky Date: Tue, 3 Sep 2019 16:47:40 -0400 Subject: [PATCH] drm/amdgpu: Add smu lock around in pp_smu_i2c_bus_access Protect from concurrent SMU accesses. Signed-off-by: Andrey Grodzovsky Reviewed-by: Tao Zhou Reviewed-and-tested-by: Guchun Chen Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/powerplay/amd_powerplay.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/powerplay/amd_powerplay.c b/drivers/gpu/drm/amd/powerplay/amd_powerplay.c index fa636cb462c1..fa8ad7db2b3a 100644 --- a/drivers/gpu/drm/amd/powerplay/amd_powerplay.c +++ b/drivers/gpu/drm/amd/powerplay/amd_powerplay.c @@ -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 = { -- 2.30.2