From: Tom Van Braeckel <tomvanbraeckel@gmail.com>
Date: Tue, 31 Mar 2015 14:39:21 +0000 (+0200)
Subject: misc: pass miscdevice through file's private_data
X-Git-Tag: omap-for-v4.1/fixes-rc1~73^2~30
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0b509d8d336eef6d622d66b3ae2a1fc3a072bf92;p=pandora-kernel.git

misc: pass miscdevice through file's private_data

Make the miscdevice accessible through the file's private_data.

Previously, this was done only when an open() file operation had been
registered. If no custom open() file operation was defined,
private_data was set to NULL.

This subtle quirk was confusing, to the point where kernel code
registered *empty* file open operations to have private_data point to
the misc device structure and avoid duplicating that logic.

And it could easily lead to bugs, where the addition or removal of a
custom open() file operation surprisingly changes the initial value of
a file's private_data structure.

To resolve this, we now place the miscdevice in the file's private_data
member unconditionally when open() is called.

Signed-off-by: Tom Van Braeckel <tomvanbraeckel@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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