tracing: do not return EFAULT if read copied anything

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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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This commit is contained in:

Steven Rostedt 2009-03-04 19:10:05 -05:00

parent 4f3640f8a3

commit 2dc5d12b1f

1 changed files with 12 additions and 2 deletions

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kernel/trace/trace.c

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