From: Steven Rostedt <srostedt@redhat.com>
Date: Thu, 5 Mar 2009 00:10:05 +0000 (-0500)
Subject: tracing: do not return EFAULT if read copied anything
X-Git-Tag: v2.6.30-rc1~2^2~69^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2dc5d12b1f43134e9bc5037f69f4739cfdfab93e;p=pandora-kernel.git

tracing: do not return EFAULT if read copied anything

Impact: fix trace read to conform to standards

Andrew Morton, Theodore Tso and H. Peter Anvin brought to my attention
that a userspace read should not return -EFAULT if it succeeded in
copying anything. It should only return -EFAULT if it failed to copy
at all.

This patch modifies the check of copy_from_user and updates the return
code appropriately.

I also used H. Peter Anvin's short cut rule to just test ret == count.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
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