linux-kernel - Re: [PATCH] HID: sony: Enable Gasia third-party PS3 controllers

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Date:	Mon, 9 Feb 2015 20:44:14 +0200
From:	Lauri Kasanen <cand@....com>
To:	Oliver Neukum <oneukum@...e.de>
Cc:	jkosina@...e.cz, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, ao2@....it, AndrewD207@....com
Subject: Re: [PATCH] HID: sony: Enable Gasia third-party PS3 controllers

On Mon, 09 Feb 2015 11:08:01 +0100
Oliver Neukum <oneukum@...e.de> wrote:

> > +	ret = usb_interrupt_msg(dev, usb_sndintpipe(dev, 0x02),
> > +				buf2, sizeof(buf2),
> > +				&transfered, USB_CTRL_SET_TIMEOUT);
> 
> You cannot do this. Even for a single byte DMA on the stack is
> wrong. Not on all architectures it works at all and you violate
> the DMA constrainsts. You must use kmalloc().

Hi Oliver,

Does this still apply when using hid_hw_output_report?

- Lauri
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