RE: [PATCH] drm/amd/powerplay: Fix uninitialized warning in arcturus ppt driver

["Quan, Evan" <Evan.Quan@xxxxxxx>]

[AMD Official Use Only - Internal Distribution Only]

Your change below should be able to suppress the compile warning.
-arcturus_get_smu_metrics_data(smu,
+ret = arcturus_get_smu_metrics_data(smu,
       METRICS_THROTTLER_STATUS,
       &throttler_status);

+if (ret) {
+dev_err(adev->dev, "Could not read from arcturus_get_smu_metrics_data()\n");
+return;
+}
+
Setting *value as 0 may be unnecessary.  However anyway this patch is reviewed-by: Evan Quan <evan.quan@xxxxxxx>

BR
Evan
-----Original Message-----
From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of Tom St Denis
Sent: Wednesday, August 12, 2020 8:21 PM
To: amd-gfx@xxxxxxxxxxxxxxxxxxxxx
Cc: StDenis, Tom <Tom.StDenis@xxxxxxx>
Subject: [PATCH] drm/amd/powerplay: Fix uninitialized warning in arcturus ppt driver

Fixes:

  CC [M]  drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.o
drivers/gpu/drm/amd/amdgpu/../powerplay/arcturus_ppt.c: In function ‘arcturus_log_thermal_throttling_event’:
drivers/gpu/drm/amd/amdgpu/../powerplay/arcturus_ppt.c:2223:24: warning: ‘throttler_status’ may be used uninitialized in this function [-Wmaybe-uninitialized]
 2223 |   if (throttler_status & logging_label[throttler_idx].feature_mask) {

by making arcturus_get_smu_metrics_data() assign a default value (of zero) before any possible return point as well as simply error out of arcturus_log_thermal_throttling_event() if it fails.

Signed-off-by: Tom St Denis <tom.stdenis@xxxxxxx>
---
 drivers/gpu/drm/amd/powerplay/arcturus_ppt.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/powerplay/arcturus_ppt.c b/drivers/gpu/drm/amd/powerplay/arcturus_ppt.c
index 8b1025dc54fd..78f7ec95e4f5 100644
--- a/drivers/gpu/drm/amd/powerplay/arcturus_ppt.c
+++ b/drivers/gpu/drm/amd/powerplay/arcturus_ppt.c
@@ -551,6 +551,9 @@ static int arcturus_get_smu_metrics_data(struct smu_context *smu,

 mutex_lock(&smu->metrics_lock);

+// assign default value
+*value = 0;
+
 ret = smu_cmn_get_metrics_table_locked(smu,
        NULL,
        false);
@@ -2208,15 +2211,20 @@ static const struct throttling_logging_label {  };  static void arcturus_log_thermal_throttling_event(struct smu_context *smu)  {
-int throttler_idx, throtting_events = 0, buf_idx = 0;
+int throttler_idx, throtting_events = 0, buf_idx = 0, ret;
 struct amdgpu_device *adev = smu->adev;
 uint32_t throttler_status;
 char log_buf[256];

-arcturus_get_smu_metrics_data(smu,
+ret = arcturus_get_smu_metrics_data(smu,
       METRICS_THROTTLER_STATUS,
       &throttler_status);

+if (ret) {
+dev_err(adev->dev, "Could not read from arcturus_get_smu_metrics_data()\n");
+return;
+}
+
 memset(log_buf, 0, sizeof(log_buf));
 for (throttler_idx = 0; throttler_idx < ARRAY_SIZE(logging_label);
      throttler_idx++) {
--
2.26.2

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