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

Dmitry Torokhov
2013-09-18T22:15:15Z

Ryan Mallon <rmallon@gmail.com> wrote:
>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?

I took your original version - is does the right thing.

Thanks.

--
Dmitry