linux-kernel - [PATCH v2] EDAC/mc_sysfs: Add missing newlines when printing {max,dimm}

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Date:   Mon, 14 Sep 2020 10:48:54 +0800
From:   Xiongfeng Wang <wangxiongfeng2@...wei.com>
To:     <bp@...en8.de>, <mchehab@...nel.org>, <tony.luck@...el.com>
CC:     <linux-edac@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <wangxiongfeng2@...wei.com>
Subject: [PATCH v2] EDAC/mc_sysfs: Add missing newlines when printing {max,dimm}_location

Reading those sysfs entries gives:

  [root@...alhost /]# cat /sys/devices/system/edac/mc/mc0/max_location
  memory 3 [root@...alhost /]# cat /sys/devices/system/edac/mc/mc0/dimm0/dimm_location
  memory 0 [root@...alhost /]#

Add newlines after the value it prints for better readability.

Signed-off-by: Xiongfeng Wang <wangxiongfeng2@...wei.com>
---
 drivers/edac/edac_mc_sysfs.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
index 4e6aca5..bf0e075 100644
--- a/drivers/edac/edac_mc_sysfs.c
+++ b/drivers/edac/edac_mc_sysfs.c
@@ -474,8 +474,12 @@ static ssize_t dimmdev_location_show(struct device *dev,
 				     struct device_attribute *mattr, char *data)
 {
 	struct dimm_info *dimm = to_dimm(dev);
+	ssize_t count;
 
-	return edac_dimm_info_location(dimm, data, PAGE_SIZE);
+	count = edac_dimm_info_location(dimm, data, PAGE_SIZE);
+	count += snprintf(data + count, PAGE_SIZE - count, "\n");
+
+	return count;
 }
 
 static ssize_t dimmdev_label_show(struct device *dev,
@@ -813,15 +817,21 @@ static ssize_t mci_max_location_show(struct device *dev,
 				     char *data)
 {
 	struct mem_ctl_info *mci = to_mci(dev);
-	int i;
+	int i, n;
 	char *p = data;
+	unsigned int len = PAGE_SIZE;
 
 	for (i = 0; i < mci->n_layers; i++) {
-		p += sprintf(p, "%s %d ",
+		n = snprintf(p, len, "%s %d ",
 			     edac_layer_name[mci->layers[i].type],
 			     mci->layers[i].size - 1);
+		p += n;
+		len -= n;
+		if (!len)
+			goto out;
 	}
-
+	p += snprintf(p, len, "\n");
+out:
 	return p - data;
 }
 
-- 
1.7.12.4