linux-kernel - Re: [PATCH v3] HID: Add full support for Logitech Unifying receivers

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Date:	Fri, 9 Sep 2011 11:28:06 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Benjamin Tissoires <benjamin.tissoires@...il.com>
Cc:	Jiri Kosina <jkosina@...e.cz>, rtitmuss@...itech.com,
	ogay@...itech.com, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Nestor Lopez Casado <nlopezcasad@...itech.com>
Subject: Re: [PATCH v3] HID: Add full support for Logitech Unifying receivers

On Thu, Sep 01, 2011 at 02:43:32PM +0200, Benjamin Tissoires wrote:
> > +
> > +       usbhid_submit_report(dj_rcv_hiddev, &report, USB_DIR_OUT);
> 
> This is not working when the receiver is paired to a keyboard. When
> the session launches, Gnome try to send leds commands to the keyboard
> and this results in an oops.
> 
> Using a  pointer to the struct hid_report solves the crash.
> 
> However, Dmitry, you told us about a DMA stack problem. Can you give
> us a better way to handle that?
> 

Actually it is OK, usbhid_submit_report internally allocates DMA_safe
memory for raw report and copies the data for you.

Thanks.

-- 
Dmitry
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