linux-kernel - Re: [PATCH 3/4] cp210x: Store part number

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Date:	Mon, 27 Jul 2015 11:29:17 +0200
From:	Oliver Neukum <oneukum@...e.com>
To:	Petr Tesarik <PTesarik@...e.com>
Cc:	Johan Hovold <johan@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	PetrTesarik <ptesarik@...e.cz>,
	open list <linux-kernel@...r.kernel.org>,
	"open list:USB SERIAL SUBSYSTEM" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH 3/4] cp210x: Store part number

On Mon, 2015-07-27 at 08:50 +0200, Petr Tesarik wrote:
> I don't understand. While you're right that I copied this part from
> Sillicon Labs' driver without much thinking, and &spriv->bPartNumber
> can be used directly, I can't see any DMA on stack. FWIW
> cp210x_control_msg always allocates a buffer using kcalloc:
> 
>         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
> /* ... */
>         result = usb_control_msg(serial->dev,
> usb_rcvctrlpipe(serial->dev, 0),
>                                  request, requesttype, value,
>                                  spriv->bInterfaceNumber, buf, size,
> timeout);
> 
> Is that what you mean?

Yes, sorry, that part wasn't so clear from the previous patch.

	Sorry
		Oliver


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