[PATCH v3 1/3] drm/amd/pm: Add missing mutex for pp_get_power_profile_mode

[Mario Limonciello]

Prevent possible issues from set and get being called simultaneously.

Signed-off-by: Mario Limonciello <mario.limoncie...@amd.com>
---
Changes from v2->v3:
 * New patch
 drivers/gpu/drm/amd/pm/powerplay/amd_powerplay.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/pm/powerplay/amd_powerplay.c 
b/drivers/gpu/drm/amd/pm/powerplay/amd_powerplay.c
index 321215003643..978007664e71 100644
--- a/drivers/gpu/drm/amd/pm/powerplay/amd_powerplay.c
+++ b/drivers/gpu/drm/amd/pm/powerplay/amd_powerplay.c
@@ -875,6 +875,7 @@ pp_dpm_get_vce_clock_state(void *handle, unsigned idx)
 static int pp_get_power_profile_mode(void *handle, char *buf)
 {
        struct pp_hwmgr *hwmgr = handle;
+       int ret;
 
        if (!hwmgr || !hwmgr->pm_en || !buf)
                return -EINVAL;
@@ -884,7 +885,10 @@ static int pp_get_power_profile_mode(void *handle, char 
*buf)
                return snprintf(buf, PAGE_SIZE, "\n");
        }
 
-       return hwmgr->hwmgr_func->get_power_profile_mode(hwmgr, buf);
+       mutex_lock(&hwmgr->smu_lock);
+       ret = hwmgr->hwmgr_func->get_power_profile_mode(hwmgr, buf);
+       mutex_unlock(&hwmgr->smu_lock);
+       return ret;
 }
 
 static int pp_set_power_profile_mode(void *handle, long *input, uint32_t size)
-- 
2.25.1