linux-kernel - Re: [RFC 1/1 v2] Input: Add ps2emu module

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Date:	Tue, 21 Jul 2015 12:57:08 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Stephen Chandler Paul <cpaul@...hat.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Arnd Bergmann <arnd@...db.de>, Joe Perches <joe@...ches.com>,
	Jiri Slaby <jslaby@...e.com>,
	Vishnu Patekar <vishnupatekar0510@...il.com>,
	Sebastian Ott <sebott@...ux.vnet.ibm.com>,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-input@...r.kernel.org, linux-api@...r.kernel.org,
	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Hans de Goede <hdegoede@...hat.com>
Subject: Re: [RFC 1/1 v2] Input: Add ps2emu module

On Tue, Jul 21, 2015 at 03:47:17PM -0400, Stephen Chandler Paul wrote:
> Debugging input devices, specifically laptop touchpads, can be tricky
> without having the physical device handy. Here we try to remedy that
> with ps2emu. This module allows an application to connect to a character
> device provided by the kernel, and simulate any PS/2 device. In
> combination with userspace programs that can record PS/2 devices and
> replay them through the /dev/ps2emu device, this allows developers to
> debug driver issues on the PS/2 level with devices simply by requesting
> a recording from the user experiencing the issue without having to have
> the physical hardware in front of them.
> 
> Signed-off-by: Stephen Chandler Paul <cpaul@...hat.com>
> Reviewed-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
> ---
> 				    Changes
> * Remove PS2EMU_MINOR, use MISC_DYNAMIC_MINOR
> * Remove ps2emu_warn(), just use dev_warn()
> * Don't return value from copy_to_user(), return -EFAULT
> * Remove usages of unlikely()
> * Remove call to nonseekable_open()
> 
> 			     Things I didn't change
> * Didn't rename this_device, I might have misinterpreted what you were saying
>   but this_device is a member of a struct that isn't defined in any of my own
>   patches. I could have renamed ps2emu_misc and ps2emu_fops to misc and fops,
>   but I'm guessing that's the wrong thing to do if I go off the style of the
>   other driver files in the kernel tree (in drivers/input, anyway).

Sorry, you are right, this is a structure that you don't have control
over.  Thanks for the other changes, looks good to me.

greg k-h
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