commit 65da3484d9be5664f5f7d2378e438bb2794f40b8
author NeilBrown <neilb@suse.com> Thu Aug 06 08:27:55 2015 +1000
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> Sun Oct 04 19:42:22 2015 +0100
tree 886ed45dc33cdfd927a395fceccbe2bd3d5cc4b5
parent cfcf6a91aa0d59faddb423a65230eea7f230d057

sysfs: correctly handle short reads on PREALLOC attrs.

attributes declared with __ATTR_PREALLOC use sysfs_kf_read()
which ignores the 'count' arg.
So a 1-byte read request can return more bytes than that.

This is seen with the 'dash' shell when 'read' is used on
some 'md' sysfs attributes.

So only return the 'min' of count and the attribute length.

Signed-off-by: NeilBrown <neilb@suse.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>