From: Ian Abbott <abbotti@mev.co.uk>
Date: Tue, 18 Sep 2012 18:46:57 +0000 (+0100)
Subject: staging: comedi: fix sparse warning in do_devconfig_ioctl()
X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~75^2~103
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dc881f294eb957bded69b5e7f2f72831e2d00ac4;p=pandora-kernel.git

staging: comedi: fix sparse warning in do_devconfig_ioctl()

For the COMEDI_DEVCONFIG ioctl, the user application may embed a pointer
to firmware data within a designated element (or two elements for 64-bit
pointers) of the `options[]` array in the `struct comedi_devconfig`.
`do_devconfig_ioctl()` calls `comedi_aux_data()` to extract the pointer
value.  It needs to be treated as a `__user` pointer so the firmware
data can be copied into kernel memory, so cast the result of
`comedi_aux_data()` to avoid a "sparse" warning.  This is not ideal but
`comedi_aux_data()` is called elsewhere in a wholly kernel memory
context so we can't just change its return type to include the `__user`
tag.

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