From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 21 Mar 2013 06:16:30 +0000 (-0400)
Subject: pipe: preparation to new locking rules
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~74^2~186
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=18c03cfd403b88852f75f200206983ee6df28423;p=pandora-kernel.git

pipe: preparation to new locking rules

* use the fact that file_inode(file)->i_pipe doesn't change
  while the file is opened - no locks needed to access that.
* switch to pipe_lock/pipe_unlock where it's easy to do

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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