linux-kernel - [PATCH 2/3] hwmon (occ): Prevent sysfs error attribute from returning error

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Date:   Tue, 16 Apr 2019 15:43:49 +0000
From:   Eddie James <eajames@...ux.ibm.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-hwmon@...r.kernel.org, linux@...ck-us.net, jdelvare@...e.com,
        andrew@...id.au, mine260309@...il.com,
        Eddie James <eajames@...ux.ibm.com>
Subject: [PATCH 2/3] hwmon (occ): Prevent sysfs error attribute from returning error

The error sysfs attribute returns the stored error state of the OCC and
doesn't depend on the OCC poll response. Therefore, split the error
attribute into it's own function to avoid failing out of the function if
the poll response fails.

Signed-off-by: Eddie James <eajames@...ux.ibm.com>
---
 drivers/hwmon/occ/sysfs.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/hwmon/occ/sysfs.c b/drivers/hwmon/occ/sysfs.c
index 1cb1e65..c73be07 100644
--- a/drivers/hwmon/occ/sysfs.c
+++ b/drivers/hwmon/occ/sysfs.c
@@ -63,9 +63,6 @@ static ssize_t occ_sysfs_show(struct device *dev,
 		else
 			val = 1;
 		break;
-	case 8:
-		val = occ->error;
-		break;
 	default:
 		return -EINVAL;
 	}
@@ -73,6 +70,16 @@ static ssize_t occ_sysfs_show(struct device *dev,
 	return snprintf(buf, PAGE_SIZE - 1, "%d\n", val);
 }
 
+static ssize_t occ_error_show(struct device *dev,
+			      struct device_attribute *attr, char *buf)
+{
+	struct occ *occ = dev_get_drvdata(dev);
+
+	occ_update_response(occ);
+
+	return snprintf(buf, PAGE_SIZE - 1, "%d\n", occ->error);
+}
+
 static SENSOR_DEVICE_ATTR(occ_master, 0444, occ_sysfs_show, NULL, 0);
 static SENSOR_DEVICE_ATTR(occ_active, 0444, occ_sysfs_show, NULL, 1);
 static SENSOR_DEVICE_ATTR(occ_dvfs_overtemp, 0444, occ_sysfs_show, NULL, 2);
@@ -81,7 +88,7 @@ static SENSOR_DEVICE_ATTR(occ_mem_throttle, 0444, occ_sysfs_show, NULL, 4);
 static SENSOR_DEVICE_ATTR(occ_quick_pwr_drop, 0444, occ_sysfs_show, NULL, 5);
 static SENSOR_DEVICE_ATTR(occ_state, 0444, occ_sysfs_show, NULL, 6);
 static SENSOR_DEVICE_ATTR(occs_present, 0444, occ_sysfs_show, NULL, 7);
-static SENSOR_DEVICE_ATTR(occ_error, 0444, occ_sysfs_show, NULL, 8);
+static DEVICE_ATTR_RO(occ_error);
 
 static struct attribute *occ_attributes[] = {
 	&sensor_dev_attr_occ_master.dev_attr.attr,
@@ -92,7 +99,7 @@ static struct attribute *occ_attributes[] = {
 	&sensor_dev_attr_occ_quick_pwr_drop.dev_attr.attr,
 	&sensor_dev_attr_occ_state.dev_attr.attr,
 	&sensor_dev_attr_occs_present.dev_attr.attr,
-	&sensor_dev_attr_occ_error.dev_attr.attr,
+	&dev_attr_occ_error.attr,
 	NULL
 };
 
@@ -156,7 +163,7 @@ void occ_sysfs_poll_done(struct occ *occ)
 	}
 
 	if (occ->error && occ->error != occ->prev_error) {
-		name = sensor_dev_attr_occ_error.dev_attr.attr.name;
+		name = dev_attr_occ_error.attr.name;
 		sysfs_notify(&occ->bus_dev->kobj, NULL, name);
 	}
 
-- 
2.7.4