linux-kernel - Re: Regression: usb serial gadget on sama5d3 broken

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Date:   Mon, 17 Oct 2016 19:50:48 +0200
From:   Peter Rosin <peda@...ntia.se>
To:     Nicolas Ferre <nicolas.ferre@...el.com>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: Regression: usb serial gadget on sama5d3 broken

On 2016-10-17 16:54, Nicolas Ferre wrote:
> Le 17/10/2016 à 14:53, Peter Rosin a écrit :
>> Hi!
>>
>> I'm suffering from a regression while using the usb gadget port on the
>> sama5d3 to get terminal access to the device in question (CONFIG_USB_G_SERIAL).
>>
>> I get this message when I try to connect:
>> udc: ep: Invalid setup request: 02.01 v0000 i0081 l0, halting endpoint...
>>
>> A bisect blames commit v4.7-rc1-21-gc32b5bcfa3c4 "ARM: dts: at91: Fix
>> USB endpoint nodes".
>>
>> And indeed, reverting that commit on top of v4.9-rc1 fixes things,
>> although that doesn't look like the best of fixes...
>>
>> BTW, the bisect was extremely painful since v4.7-rc1 seemed broken
>> somewhere in the overlayfs area. I hope I will never ever need to bisect
>> in the v4.6..v4.7 area again. This was the second time, the first time
>> I was chasing a gpio interrupt bug, but I never found out what was wrong
>> and stopped looking when v4.9-rc1 turned out to be ok even though v4.8
>> was bad, it was just too painful to look for things that already seemed
>> fixed.
> 
> I guess that you are referring to the regression listed here:
> https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1239220.html
> 
> The patch is available and will hopefully land in an official kernel
> soon (4.8.1) as said by Felipe and Greg.
> 
> Sorry for the inconvenience. Best regards,

Ok, I tried "usb: gadget: udc: atmel: fix endpoint name" and it fixes
things for me too. But shouldn't the memory for the now dynamic name be
allocated with devm_kasprintf instead of that plain kasprint? If you
are pedantic...

Cheers,
Peter