Can't commit "out of date" file, but "svn update" won't fix it

There is a file that I can't commit because it is supposedly
"out of date", even if I update it immediately before that:

svn update linux-2.6.x/sound/blackfin/Makefile
At revision 375.
svn commit linux-2.6.x/sound/blackfin/Makefile -m "Comment"
Adding linux-2.6.x/sound/blackfin/Makefile
svn: Commit failed (details follow):
svn: Out of date: '/trunk/linux-2.6.x/sound/blackfin/Makefile' in transaction '375-1'

I don't see how it can be out of date if I just updated it.
More info about that file:

svn status linux-2.6.x/sound/blackfin/Makefile
A + linux-2.6.x/sound/blackfin/Makefile

svn info linux-2.6.x/sound/blackfin/Makefile
Path: linux-2.6.x/sound/blackfin/Makefile
Name: Makefile
URL: svn://192.168.25.29/trunk/linux-2.6.x/sound/blackfin/Makefile
Repository Root: svn://192.168.25.29
Revision: 375
Node Kind: file
Schedule: add
Copied From URL: svn://192.168.25.29/trunk/linux-2.6.x/sound/blackfin/Makefile
Copied From Rev: 232
Last Changed Rev: 106
Last Changed Date: 2007-10-09 10:07:20 -0600 (Tue, 09 Oct 2007)
Text Last Updated: 2008-10-07 16:28:10 -0600 (Tue, 07 Oct 2008)
Checksum: aa91698b7411c2a60089a45573005f65

What am I doing wrong?

Steve

---
Steve Strobel
Link Communications, Inc.
1035 Cerise Rd
Billings, MT 59101-7378
(406) 245-5002 ext 102
(406) 245-4889 (fax)
WWW: http://www.link-comm.com
MailTo:steve.strobel_at_link-comm.com
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