From: Ian Abbott <abbotti@mev.co.uk>
Date: Fri, 8 Nov 2013 15:03:36 +0000 (+0000)
Subject: staging: comedi: use refcount while reading /proc/comedi
X-Git-Tag: v3.14-rc1~150^2~775^2~89
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=616a3548e816553c31d57cc211a86d327a192e12;p=pandora-kernel.git

staging: comedi: use refcount while reading /proc/comedi

In the seq_file 'show' handler for "/proc/comedi" - `comedi_read()` in
"comedi/proc.c",  call `comedi_dev_get_from_minor()` instead of
`comedi_dev_from_minor()` to increment the reference counter for the
`struct comedi_device` while it is being examined.  Call
`comedi_dev_put()` to decrement the reference afterwards.  Also acquire
the `attach_lock` rwsem while checking whether the device is attached.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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