From dd20908a8a06b22c171f6c3fcdbdbd65bed07505 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Fri, 14 Mar 2014 10:56:20 -0400
Subject: [PATCH] don't bother with {get,put}_write_access() on non-regular
 files

it's pointless and actually leads to wrong behaviour in at least one
moderately convoluted case (pipe(), close one end, try to get to
another via /proc/*/fd and run into ETXTBUSY).

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