linux-kernel - Re: [PATCH 1/2] usb: chipidea: udc: improve error handling on ep

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Message-ID: <CAGrhNMy8YH2o=HGNXfUyr0reGz915kx+MDN_zD4+4NKjshT3uA@mail.gmail.com>
Date:	Mon, 21 Sep 2015 10:17:06 +0100
From:	Felipe Tonello <eu@...ipetonello.com>
To:	Peter Chen <peter.chen@...escale.com>
Cc:	USB list <linux-usb@...r.kernel.org>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Felipe Balbi <balbi@...com>,
	Andrzej Pietrasiewicz <andrzej.p@...sung.com>
Subject: Re: [PATCH 1/2] usb: chipidea: udc: improve error handling on ep_queue

Hi Peter,

On Mon, Sep 21, 2015 at 7:29 AM, Peter Chen <peter.chen@...escale.com> wrote:
> On Fri, Sep 18, 2015 at 06:12:40PM +0100, eu@...ipetonello.com wrote:
>> From: "Felipe F. Tonello" <eu@...ipetonello.com>
>>
>> _ep_queue() didn't check for errors when using add_td_to_list()
>> which can fail if dma_pool_alloc fails, thus causing a kernel
>
> Would you find the root cause why dma_pool_alloc fails?

Partially. For some reason the udc_irq() is not been called after a
f_midi_transmit(). I am looking into that.

Felipe
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