habanalabs: modify the return values of hl_read/write routines

The hl read and write routines implement the hwmon_ops read and write
interface routines respectively.
These routines are expected to return a completion status when called,
which was not the case until this commit.
This commit modifies these routines to return 0 upon success and a
negative error value upon failure.

Signed-off-by: Moti Haimovski <mhaimovski@habana.ai>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>

2 files changed, 43 insertions, 37 deletions

diff --git a/drivers/misc/habanalabs/habanalabs.h b/drivers/misc/habanalabs/habanalabs.h
index 4de12d3ff836..9472da3ef847 100644
--- a/drivers/misc/habanalabs/habanalabs.h
+++ b/drivers/misc/habanalabs/habanalabs.h
@@ -1609,13 +1609,18 @@ int hl_pci_set_dma_mask(struct hl_device *hdev, u8 dma_mask);
 
 long hl_get_frequency(struct hl_device *hdev, u32 pll_index, bool curr);
 void hl_set_frequency(struct hl_device *hdev, u32 pll_index, u64 freq);
-long hl_get_temperature(struct hl_device *hdev, int sensor_index, u32 attr);
+int hl_get_temperature(struct hl_device *hdev,
+		       int sensor_index, u32 attr, long *value);
 int hl_set_temperature(struct hl_device *hdev,
-			int sensor_index, u32 attr, long value);
-long hl_get_voltage(struct hl_device *hdev, int sensor_index, u32 attr);
-long hl_get_current(struct hl_device *hdev, int sensor_index, u32 attr);
-long hl_get_fan_speed(struct hl_device *hdev, int sensor_index, u32 attr);
-long hl_get_pwm_info(struct hl_device *hdev, int sensor_index, u32 attr);
+		       int sensor_index, u32 attr, long value);
+int hl_get_voltage(struct hl_device *hdev,
+		   int sensor_index, u32 attr, long *value);
+int hl_get_current(struct hl_device *hdev,
+		   int sensor_index, u32 attr, long *value);
+int hl_get_fan_speed(struct hl_device *hdev,
+		     int sensor_index, u32 attr, long *value);
+int hl_get_pwm_info(struct hl_device *hdev,
+		    int sensor_index, u32 attr, long *value);
 void hl_set_pwm_info(struct hl_device *hdev, int sensor_index, u32 attr,
 			long value);
 u64 hl_get_max_power(struct hl_device *hdev);
diff --git a/drivers/misc/habanalabs/hwmon.c b/drivers/misc/habanalabs/hwmon.c
index 70088fdb0a5b..3539190b1caa 100644
--- a/drivers/misc/habanalabs/hwmon.c
+++ b/drivers/misc/habanalabs/hwmon.c
@@ -113,6 +113,7 @@ static int hl_read(struct device *dev, enum hwmon_sensor_types type,
 			u32 attr, int channel, long *val)
 {
 	struct hl_device *hdev = dev_get_drvdata(dev);
+	int rc;
 
 	if (hl_device_disabled_or_in_reset(hdev))
 		return -ENODEV;
@@ -131,7 +132,7 @@ static int hl_read(struct device *dev, enum hwmon_sensor_types type,
 			return -EINVAL;
 		}
 
-		*val = hl_get_temperature(hdev, channel, attr);
+		rc = hl_get_temperature(hdev, channel, attr, val);
 		break;
 	case hwmon_in:
 		switch (attr) {
@@ -143,7 +144,7 @@ static int hl_read(struct device *dev, enum hwmon_sensor_types type,
 			return -EINVAL;
 		}
 
-		*val = hl_get_voltage(hdev, channel, attr);
+		rc = hl_get_voltage(hdev, channel, attr, val);
 		break;
 	case hwmon_curr:
 		switch (attr) {
@@ -155,7 +156,7 @@ static int hl_read(struct device *dev, enum hwmon_sensor_types type,
 			return -EINVAL;
 		}
 
-		*val = hl_get_current(hdev, channel, attr);
+		rc = hl_get_current(hdev, channel, attr, val);
 		break;
 	case hwmon_fan:
 		switch (attr) {
@@ -166,7 +167,7 @@ static int hl_read(struct device *dev, enum hwmon_sensor_types type,
 		default:
 			return -EINVAL;
 		}
-		*val = hl_get_fan_speed(hdev, channel, attr);
+		rc = hl_get_fan_speed(hdev, channel, attr, val);
 		break;
 	case hwmon_pwm:
 		switch (attr) {
@@ -176,12 +177,12 @@ static int hl_read(struct device *dev, enum hwmon_sensor_types type,
 		default:
 			return -EINVAL;
 		}
-		*val = hl_get_pwm_info(hdev, channel, attr);
+		rc = hl_get_pwm_info(hdev, channel, attr, val);
 		break;
 	default:
 		return -EINVAL;
 	}
-	return 0;
+	return rc;
 }
 
 static int hl_write(struct device *dev, enum hwmon_sensor_types type,
@@ -277,10 +278,10 @@ static const struct hwmon_ops hl_hwmon_ops = {
 	.write = hl_write
 };
 
-long hl_get_temperature(struct hl_device *hdev, int sensor_index, u32 attr)
+int hl_get_temperature(struct hl_device *hdev,
+			int sensor_index, u32 attr, long *value)
 {
 	struct armcp_packet pkt;
-	long result;
 	int rc;
 
 	memset(&pkt, 0, sizeof(pkt));
@@ -291,16 +292,16 @@ long hl_get_temperature(struct hl_device *hdev, int sensor_index, u32 attr)
 	pkt.type = __cpu_to_le16(attr);
 
 	rc = hdev->asic_funcs->send_cpu_message(hdev, (u32 *) &pkt, sizeof(pkt),
-			SENSORS_PKT_TIMEOUT, &result);
+			SENSORS_PKT_TIMEOUT, value);
 
 	if (rc) {
 		dev_err(hdev->dev,
 			"Failed to get temperature from sensor %d, error %d\n",
 			sensor_index, rc);
-		result = 0;
+		*value = 0;
 	}
 
-	return result;
+	return rc;
 }
 
 int hl_set_temperature(struct hl_device *hdev,
@@ -328,10 +329,10 @@ int hl_set_temperature(struct hl_device *hdev,
 	return rc;
 }
 
-long hl_get_voltage(struct hl_device *hdev, int sensor_index, u32 attr)
+int hl_get_voltage(struct hl_device *hdev,
+			int sensor_index, u32 attr, long *value)
 {
 	struct armcp_packet pkt;
-	long result;
 	int rc;
 
 	memset(&pkt, 0, sizeof(pkt));
@@ -342,22 +343,22 @@ long hl_get_voltage(struct hl_device *hdev, int sensor_index, u32 attr)
 	pkt.type = __cpu_to_le16(attr);
 
 	rc = hdev->asic_funcs->send_cpu_message(hdev, (u32 *) &pkt, sizeof(pkt),
-					SENSORS_PKT_TIMEOUT, &result);
+					SENSORS_PKT_TIMEOUT, value);
 
 	if (rc) {
 		dev_err(hdev->dev,
 			"Failed to get voltage from sensor %d, error %d\n",
 			sensor_index, rc);
-		result = 0;
+		*value = 0;
 	}
 
-	return result;
+	return rc;
 }
 
-long hl_get_current(struct hl_device *hdev, int sensor_index, u32 attr)
+int hl_get_current(struct hl_device *hdev,
+			int sensor_index, u32 attr, long *value)
 {
 	struct armcp_packet pkt;
-	long result;
 	int rc;
 
 	memset(&pkt, 0, sizeof(pkt));
@@ -368,22 +369,22 @@ long hl_get_current(struct hl_device *hdev, int sensor_index, u32 attr)
 	pkt.type = __cpu_to_le16(attr);
 
 	rc = hdev->asic_funcs->send_cpu_message(hdev, (u32 *) &pkt, sizeof(pkt),
-					SENSORS_PKT_TIMEOUT, &result);
+					SENSORS_PKT_TIMEOUT, value);
 
 	if (rc) {
 		dev_err(hdev->dev,
 			"Failed to get current from sensor %d, error %d\n",
 			sensor_index, rc);
-		result = 0;
+		*value = 0;
 	}
 
-	return result;
+	return rc;
 }
 
-long hl_get_fan_speed(struct hl_device *hdev, int sensor_index, u32 attr)
+int hl_get_fan_speed(struct hl_device *hdev,
+			int sensor_index, u32 attr, long *value)
 {
 	struct armcp_packet pkt;
-	long result;
 	int rc;
 
 	memset(&pkt, 0, sizeof(pkt));
@@ -394,22 +395,22 @@ long hl_get_fan_speed(struct hl_device *hdev, int sensor_index, u32 attr)
 	pkt.type = __cpu_to_le16(attr);
 
 	rc = hdev->asic_funcs->send_cpu_message(hdev, (u32 *) &pkt, sizeof(pkt),
-					SENSORS_PKT_TIMEOUT, &result);
+					SENSORS_PKT_TIMEOUT, value);
 
 	if (rc) {
 		dev_err(hdev->dev,
 			"Failed to get fan speed from sensor %d, error %d\n",
 			sensor_index, rc);
-		result = 0;
+		*value = 0;
 	}
 
-	return result;
+	return rc;
 }
 
-long hl_get_pwm_info(struct hl_device *hdev, int sensor_index, u32 attr)
+int hl_get_pwm_info(struct hl_device *hdev,
+			int sensor_index, u32 attr, long *value)
 {
 	struct armcp_packet pkt;
-	long result;
 	int rc;
 
 	memset(&pkt, 0, sizeof(pkt));
@@ -420,16 +421,16 @@ long hl_get_pwm_info(struct hl_device *hdev, int sensor_index, u32 attr)
 	pkt.type = __cpu_to_le16(attr);
 
 	rc = hdev->asic_funcs->send_cpu_message(hdev, (u32 *) &pkt, sizeof(pkt),
-					SENSORS_PKT_TIMEOUT, &result);
+					SENSORS_PKT_TIMEOUT, value);
 
 	if (rc) {
 		dev_err(hdev->dev,
 			"Failed to get pwm info from sensor %d, error %d\n",
 			sensor_index, rc);
-		result = 0;
+		*value = 0;
 	}
 
-	return result;
+	return rc;
 }
 
 void hl_set_pwm_info(struct hl_device *hdev, int sensor_index, u32 attr,