[PATCH 4/6] hwmon: (k10temp): Show errors failing to read

[Mario Limonciello <mario.limonciello@xxxxxxx>]

Enabling Yellow Carp in past commit was initially not working "properly"
because extra IDs were needed, but this wasn't obvious because fail values
from `amd_smn_read` were ignored.
If errors are found, show a kernel warning.

Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
---
 drivers/hwmon/k10temp.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/hwmon/k10temp.c b/drivers/hwmon/k10temp.c
index 5c1aebf7a56d..41d9c0c0a1f1 100644
--- a/drivers/hwmon/k10temp.c
+++ b/drivers/hwmon/k10temp.c
@@ -164,8 +164,10 @@ static void read_tempreg_nb_f15(struct pci_dev *pdev, u32 *regval)
 
 static void read_tempreg_nb_zen(struct pci_dev *pdev, u32 *regval)
 {
-	amd_smn_read(amd_pci_dev_to_node_id(pdev),
+	int ret = amd_smn_read(amd_pci_dev_to_node_id(pdev),
 		     ZEN_REPORTED_TEMP_CTRL_BASE, regval);
+	if (ret)
+		dev_warn(&pdev->dev, "failed to read core temperature: %d\n", ret);
 }
 
 static long get_raw_temp(struct k10temp_data *data)
@@ -212,6 +214,7 @@ static int k10temp_read_temp(struct device *dev, u32 attr, int channel,
 {
 	struct k10temp_data *data = dev_get_drvdata(dev);
 	u32 regval;
+	int ret;
 
 	switch (attr) {
 	case hwmon_temp_input:
@@ -227,10 +230,13 @@ static int k10temp_read_temp(struct device *dev, u32 attr, int channel,
 				*val = 0;
 			break;
 		case 2 ... 9:		/* Tccd{1-8} */
-			amd_smn_read(amd_pci_dev_to_node_id(data->pdev),
+			ret = amd_smn_read(amd_pci_dev_to_node_id(data->pdev),
 				     ZEN_CCD_TEMP(data->ccd_offset, channel - 2),
 						  &regval);
-			*val = (regval & ZEN_CCD_TEMP_MASK) * 125 - 49000;
+			if (ret)
+				dev_warn(dev, "failed to read CCD temperature: %d\n", ret);
+			else
+				*val = (regval & ZEN_CCD_TEMP_MASK) * 125 - 49000;
 			break;
 		default:
 			return -EOPNOTSUPP;
-- 
2.25.1