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Subject[PATCH 03/50] docs/sysfs: show() methods should use scnprintf().
From: Bart Van Assche <>

Since snprintf() may return a value that exceeds its second argument,
show() methods should use scnprintf() instead of snprintf(). This patch
updates the example in the sysfs documentation accordingly.

Signed-off-by: Bart Van Assche <>
Cc: Tejun Heo <>
Cc: Dmitry Torokhov <>
Signed-off-by: Greg Kroah-Hartman <>
Documentation/filesystems/sysfs.txt | 6 +++---
1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/Documentation/filesystems/sysfs.txt b/Documentation/filesystems/sysfs.txt
index 2ed95f9..f806e50 100644
--- a/Documentation/filesystems/sysfs.txt
+++ b/Documentation/filesystems/sysfs.txt
@@ -210,9 +210,9 @@ Other notes:
is 4096.

- show() methods should return the number of bytes printed into the
- buffer. This is the return value of snprintf().
+ buffer. This is the return value of scnprintf().

-- show() should always use snprintf().
+- show() should always use scnprintf().

- store() should return the number of bytes used from the buffer. If the
entire buffer has been used, just return the count argument.
@@ -231,7 +231,7 @@ A very simple (and naive) implementation of a device attribute is:
static ssize_t show_name(struct device *dev, struct device_attribute *attr,
char *buf)
- return snprintf(buf, PAGE_SIZE, "%s\n", dev->name);
+ return scnprintf(buf, PAGE_SIZE, "%s\n", dev->name);

static ssize_t store_name(struct device *dev, struct device_attribute *attr,

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