linux-kernel - Re: [PATCH 3/5] usb: isp1760: udc: add missing usb_ep_set_maxpacket

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Message-ID: <559BFD3E.6040609@hackerion.com>
Date:	Tue, 07 Jul 2015 18:24:30 +0200
From:	Robert Baldyga <r.baldyga@...kerion.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>,
	Robert Baldyga <r.baldyga@...sung.com>
CC:	gregkh@...uxfoundation.org, balbi@...com,
	devel@...verdev.osuosl.org, hamohammed.sa@...il.com,
	chris@...vick.com, tapaswenipathak@...il.com,
	linux-usb@...r.kernel.org, nicolas.ferre@...el.com,
	hgujulan@...teon.com, mina86@...a86.com,
	linux-kernel@...r.kernel.org, vinc94@...il.com,
	roberta.dobrescu@...il.com, andrzej.p@...sung.com,
	linux-arm-kernel@...ts.infradead.org, m.szyprowski@...sung.com
Subject: Re: [PATCH 3/5] usb: isp1760: udc: add missing usb_ep_set_maxpacket_limit()

On 07/07/2015 05:01 PM, Dan Carpenter wrote:
> On Tue, Jul 07, 2015 at 04:02:51PM +0200, Robert Baldyga wrote:
>> Should use usb_ep_set_maxpacket_limit instead of setting
>> maxpacket value manually.
>>
>
> This is a behavior change, right, since now we're setting
> ep->ep.maxpacket and ep->ep.maxpacket_limit where before we only set
> the first.  I don't understand.  This patch description is not clear.

Since maxpacket_limit was introduced all UDC drivers should set it, as 
it is used by epautoconf. The ep.maxpacket_limit contains actual maximum 
maxpacket value supported by hardware, ep.maxpacket is set only for 
backward compatibility. Hence setting maxpacket manually instead of 
using usb_ep_set_maxpacket_limit() is actually a bug.

I will add better description to commit message.

>
>> Signed-off-by: Robert Baldyga <r.baldyga@...sung.com>
>> ---
>>   drivers/usb/isp1760/isp1760-udc.c | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/usb/isp1760/isp1760-udc.c b/drivers/usb/isp1760/isp1760-udc.c
>> index 18ebf5b1..3699962 100644
>> --- a/drivers/usb/isp1760/isp1760-udc.c
>> +++ b/drivers/usb/isp1760/isp1760-udc.c
>> @@ -1382,11 +1382,11 @@ static void isp1760_udc_init_eps(struct isp1760_udc *udc)
>>   		 * This fits in the 8kB FIFO without double-buffering.
>>   		 */
>>   		if (ep_num == 0) {
>> -			ep->ep.maxpacket = 64;
>> +			usb_ep_set_maxpacket_limit(&ep->ep, 64);
>>   			ep->maxpacket = 64;
>>   			udc->gadget.ep0 = &ep->ep;
>>   		} else {
>> -			ep->ep.maxpacket = 512;
>> +			usb_ep_set_maxpacket_limit(&ep->ep, 512);
>>   			ep->maxpacket = 0;
>>   			list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
>>   		}

Thanks,
Robert Baldyga

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