From: Martin Kepplinger <martink@posteo.de>
Date: Wed, 29 Oct 2014 19:22:56 +0000 (+0100)
Subject: misc: always assign miscdevice to file->private_data in open()
X-Git-Tag: omap-for-v3.19/fixes-rc1~84^2~54
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=32eca22180804f71b06b63fd29b72f58be8b3c47;p=pandora-kernel.git

misc: always assign miscdevice to file->private_data in open()

As of now, a miscdevice driver has to provide an implementation of
the open() file operation if it wants to have misc_open() assign a
pointer to struct miscdevice to file->private_data for other file
operations to use (given the user calls open()).

This leads to situations where a miscdevice driver that doesn't need
internal operations during open() has to implement open() that only
returns immediately, in order to use the data in private_data in other
fops.

This provides consistent behaviour for miscdevice developers and will
always provide the pointer in private_data. A driver's open() fop would,
of course, just overwrite it, when using private_data itself.

Signed-off-by: Martin Kepplinger <martink@posteo.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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