linux-kernel - Re: [PATCH 1/3] firmware: allow firmware files to be built into kernel image

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Date:	Fri, 23 May 2008 20:14:07 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Takashi Iwai <tiwai@...e.de>, linux-kernel@...r.kernel.org,
	aoliva@...hat.com, Abhay Salunke <Abhay_Salunke@...l.com>,
	kay.sievers@...y.org, Haroldo Gamal <gamal@...ernex.com.br>
Subject: Re: [PATCH 1/3] firmware: allow firmware files to be built into
	kernel	image

On Fri, 2008-05-23 at 16:33 +0100, Alan Cox wrote:
> > Yeah, I thought about that. I was slightly concerned that drivers might
> > actually try to _modify_ the firmware they loaded, though. As it is,
> > there's no fundamental reason why they shouldn't do that.
> 
> I've not seen any that do and judicious use of "const" should catch
> offenders.

Like this one...

static const int dvico_firmware_id_offsets[] = { 6638, 3204 };
static int bluebird_patch_dvico_firmware_download(struct usb_device *udev,
						  const struct firmware *fw)
{
	int pos;

	for (pos = 0; pos < ARRAY_SIZE(dvico_firmware_id_offsets); pos++) {
		int idoff = dvico_firmware_id_offsets[pos];

		if (fw->size < idoff + 4)
			continue;

		if (fw->data[idoff] == (USB_VID_DVICO & 0xff) &&
		    fw->data[idoff + 1] == USB_VID_DVICO >> 8) {
			fw->data[idoff + 2] =
				le16_to_cpu(udev->descriptor.idProduct) + 1;
			fw->data[idoff + 3] =
				le16_to_cpu(udev->descriptor.idProduct) >> 8;

			return usb_cypress_load_firmware(udev, fw, CYPRESS_FX2);
		}
	}

	return -EINVAL;
}

-- 
dwmw2

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