linux-kernel - Re: [PATCH] hid: Logitech G13 driver 0.0.4

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Date:	Thu, 28 Jan 2010 08:47:50 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	Pavel Machek <pavel@....cz>
Cc:	"Rick L. Vinyard, Jr." <rvinyard@...nmsu.edu>,
	Jiri Kosina <jkosina@...e.cz>, linux-kernel@...r.kernel.org,
	felipe.balbi@...ia.com, jayakumar.lkml@...il.com,
	linux-fbdev@...r.kernel.org, krzysztof.h1@...pl,
	akpm@...ux-foundation.org, linux-usb@...r.kernel.org,
	linux-input@...r.kernel.org, dmitry.torokhov@...il.com
Subject: Re: [PATCH] hid: Logitech G13 driver 0.0.4

 Am Donnerstag, 28. Januar 2010 08:24:26 schrieben Sie:
> > Again, like I said, I don't have a problem changing it. If it's wrong,
> > it's wrong no matter how many other drivers may take the same
> > approach.
> 
> I believe it is wrong.

So do I. You need not fail if copy_to_user() fails, but if you go
that route you need to evaluate the return value of copy_to_user()
and return:

not_written = copy_to_user(...);
return to_be_written - not_written ? to_be_written - not_written : -EFAULT;

	Regards
		Oliver
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