netdev - Re: [PATCH v6] can: kvaser_usb: Add support for Kvaser CAN/USB devices

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Date:	Fri, 23 Nov 2012 09:48:22 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Greg KH <gregkh@...uxfoundation.org>
CC:	Olivier Sobrie <olivier@...rie.be>,
	Wolfgang Grandegger <wg@...ndegger.com>,
	linux-can@...r.kernel.org, netdev@...r.kernel.org,
	linux-usb@...r.kernel.org, Daniel Berglund <db@...ser.com>
Subject: Re: [PATCH v6] can: kvaser_usb: Add support for Kvaser CAN/USB devices

On 11/22/2012 10:30 PM, Greg KH wrote:
> On Thu, Nov 22, 2012 at 04:01:49PM +0100, Olivier Sobrie wrote:
>> Hi linux-usb folks,
>>
>> Is there someone who can help me to fix the following errors?
>>
>> smatch warnings:
>>
>> + drivers/net/can/usb/kvaser_usb.c:431 kvaser_usb_send_simple_msg() error: doing
>> +dma on the stack ((null))
>> + drivers/net/can/usb/kvaser_usb.c:1073 kvaser_usb_set_opt_mode() error: doing
>> +dma on the stack ((null))
>> + drivers/net/can/usb/kvaser_usb.c:1174 kvaser_usb_flush_queue() error: doing
>> +dma on the stack ((null))
>> + drivers/net/can/usb/kvaser_usb.c:1384 kvaser_usb_set_bittiming() error: doing
>> +dma on the stack ((null))
>>
>> I assume it's due to the buffer I pass to the function usb_bulk_msg()
>> which is on the stack and can't be.
>> Do I just have to kmalloc a buffer and give it to the usb_bulk_msg()
>> function? That's what I understood by reading
>> "Documentation/DMA-API-HOWTO.txt" section "What memory is DMA'able?"...
>> and from commit
>> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=32ec4576c3fb37316b1d11a04b220527822f3f0d
> 
> Yes, that is all that is needed.

Thanks Greg. Olivier, you can post an incremental patch, I'll squash it
before sending the patches upstream.

regards,
Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
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