linux-kernel - Re: [PATCH 2/2] uinput: Support injecting multiple events in one write() call

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Date:	Thu, 19 Sep 2013 07:36:11 +1000
From:	Ryan Mallon <rmallon@...il.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	rydberg@...omail.se, carl@...labs.com, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] uinput: Support injecting multiple events in one
 write() call

On 19/09/13 05:48, Dmitry Torokhov wrote:

> Hi Ryan,
> 
> On Wed, Sep 18, 2013 at 08:55:44AM +1000, Ryan Mallon wrote:
>> Rework the code in uinput_inject_event so that it matches the code in
>> evdev_write and allows injecting more than one event, or zero events.
> 
> After some thinking I went back to the original version of your patch.
> For justification see 46f49b7a223ac7493e7cf619fb583d11edefc2c2:
> 
> "When copy_to/from_user fails in the middle of transfer we should not
> report to the user that read/write partially succeeded but rather
> report -EFAULT right away, so that application will know that it got
> its buffers all wrong.
> 
> If application messed up its buffers we can't trust the data fetched
> from userspace and successfully written to the device or if data read
> from the device and transferred to userspace ended up where application
> expected it to end."


Okay, so patch 1 is obviously dropped. Do you want me to resend a fixed 
version of this one, or have you already modified it?

Thanks,
~Ryan

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