linux-kernel - [PATCHv2 22/28] cxusb: treat firmware data as const

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Message-Id: <E1K0DOK-0007EC-6q@shinybook.infradead.org>
Date:	Sun, 25 May 2008 11:23:52 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	linux-kernel@...r.kernel.org
Cc:	sam@...nborg.org, alan@...rguk.ukuu.org.uk,
	akpm@...ux-foundation.org,
	Patrick Boettcher <patrick.boettcher@...y.de>,
	Michael Krufky <mkrufky@...uxtv.org>,
	Chris Pascoe <c.pascoe@...e.uq.edu.au>
Subject: [PATCHv2 22/28] cxusb: treat firmware data as const

...which means allocating our own copy when we want to modify it.

Signed-off-by: David Woodhouse <dwmw2@...radead.org>
---
 drivers/media/dvb/dvb-usb/cxusb.c |   21 ++++++++++++++++++---
 1 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/drivers/media/dvb/dvb-usb/cxusb.c b/drivers/media/dvb/dvb-usb/cxusb.c
index 720fcd1..94bb482 100644
--- a/drivers/media/dvb/dvb-usb/cxusb.c
+++ b/drivers/media/dvb/dvb-usb/cxusb.c
@@ -24,6 +24,7 @@
  * see Documentation/dvb/README.dvb-usb for more information
  */
 #include <media/tuner.h>
+#include <linux/vmalloc.h>
 
 #include "cxusb.h"
 
@@ -700,12 +701,26 @@ static int bluebird_patch_dvico_firmware_download(struct usb_device *udev,
 
 		if (fw->data[idoff] == (USB_VID_DVICO & 0xff) &&
 		    fw->data[idoff + 1] == USB_VID_DVICO >> 8) {
-			fw->data[idoff + 2] =
+			struct firmware new_fw;
+			u8 *new_fw_data = vmalloc(fw->size);
+			int ret;
+
+			if (!new_fw_data)
+				return -ENOMEM;
+
+			memcpy(new_fw_data, fw->data, fw->size);
+			new_fw.size = fw->size;
+			new_fw.data = fw->data;
+
+			new_fw_data[idoff + 2] =
 				le16_to_cpu(udev->descriptor.idProduct) + 1;
-			fw->data[idoff + 3] =
+			new_fw_data[idoff + 3] =
 				le16_to_cpu(udev->descriptor.idProduct) >> 8;
 
-			return usb_cypress_load_firmware(udev, fw, CYPRESS_FX2);
+			ret = usb_cypress_load_firmware(udev, &new_fw,
+							CYPRESS_FX2);
+			vfree(new_fw_data);
+			return ret;
 		}
 	}
 
-- 
1.5.4.5

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