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

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Message-ID: <20121122213022.GB1461@kroah.com>
Date:	Thu, 22 Nov 2012 13:30:22 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Olivier Sobrie <olivier@...rie.be>
Cc:	Wolfgang Grandegger <wg@...ndegger.com>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	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 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 k-h
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