linux-kernel - Re: [PATCH v2 08/15] usb: misc: idmouse: update to use usb_control_msg

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Message-ID: <1dd2bfc0-5190-1841-e04b-4a864dfd0be4@gmail.com>
Date:   Thu, 7 Jan 2021 19:36:10 +0530
From:   Anant Thazhemadam <anant.thazhemadam@...il.com>
To:     Johan Hovold <johan@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 08/15] usb: misc: idmouse: update to use
 usb_control_msg_send()


On 04/12/20 8:16 pm, Johan Hovold wrote:
> On Mon, Nov 30, 2020 at 07:00:31AM +0530, Anant Thazhemadam wrote:
>> The newer usb_control_msg_{send|recv}() API are an improvement on the
>> existing usb_control_msg() as it ensures that a short read/write is treated
>> as an error, data can be used off the stack, and raw usb pipes need not be
>> created in the calling functions.
>> For this reason, the instance of usb_control_msg() has been replaced with
>> usb_control_msg_send() appropriately.
>>
>> Signed-off-by: Anant Thazhemadam <anant.thazhemadam@...il.com>
>> ---
>>  drivers/usb/misc/idmouse.c | 5 +++--
>>  1 file changed, 3 insertions(+), 2 deletions(-)
> Especially for control transfers without a data stage there isn't
> really any benefit of the new helper.
>
> I'd just leave this one unchanged.
>
>> diff --git a/drivers/usb/misc/idmouse.c b/drivers/usb/misc/idmouse.c
>> index e9437a176518..52126441a633 100644
>> --- a/drivers/usb/misc/idmouse.c
>> +++ b/drivers/usb/misc/idmouse.c
>> @@ -56,8 +56,9 @@ static const struct usb_device_id idmouse_table[] = {
>>  #define FTIP_SCROLL  0x24
>>  
>>  #define ftip_command(dev, command, value, index) \
>> -	usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), command, \
>> -	USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT, value, index, NULL, 0, 1000)
>> +	usb_control_msg_send(dev->udev, 0, command, \
>> +	USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT, \
>> +	value, index, NULL, 0, 1000, GFP_KERNEL)
>>  
>>  MODULE_DEVICE_TABLE(usb, idmouse_table);
> Johan

Understood. I'll make sure this is left out in the v3.

Thanks,
Anant