linux-kernel - lseek() on debugfs entries in 2.6.37

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Date:	Tue, 15 Mar 2011 15:54:14 +0300
From:	Alexey Mikhailov <karma@...ois.botik.ru>
To:	linux-kernel@...r.kernel.org
Subject: lseek() on debugfs entries in 2.6.37

Hello!

I use simple debugfs entries for user-space <-> kernel-space
interaction. Basically I read unsigned integers from debugfs
files like this:

   ...
   char buf[64];
   lseek(timesync_fd, 0, SEEK_SET);
   read(timesync_fd, buf, sizeof(buf));
   ...

It works perfectly with 2.6.32 kernel. But with 2.6.37 kernel,
lseek() fails with errno=29(Illegal seek). So second read()
call just fails or returns garbage. Can someone please shed
some light on it?

Thank you,
-- Alexey.
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