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-rw-r--r--Documentation/filesystems/sysfs.txt5
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/filesystems/sysfs.txt b/Documentation/filesystems/sysfs.txt
index b35a64b82f9e..9494afb9476a 100644
--- a/Documentation/filesystems/sysfs.txt
+++ b/Documentation/filesystems/sysfs.txt
@@ -212,7 +212,10 @@ Other notes:
- show() methods should return the number of bytes printed into the
buffer. This is the return value of scnprintf().
-- show() should always use scnprintf().
+- show() must not use snprintf() when formatting the value to be
+ returned to user space. If you can guarantee that an overflow
+ will never happen you can use sprintf() otherwise you must 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.

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