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authorIvo van Doorn <ivdoorn@gmail.com>2009-01-28 00:33:47 +0100
committerJohn W. Linville <linville@tuxdriver.com>2009-02-09 21:03:35 +0100
commit0cbe0064614ace61e08618948f82c6d525e75017 (patch)
treedc6f68d5da42ab6ada2fab2bd4e5fecfa6f1ed8c /drivers/net/wireless/rt2x00/rt73usb.c
parentrt2x00: Add kill_tx_queue callback function (diff)
downloadlinux-0cbe0064614ace61e08618948f82c6d525e75017.tar.xz
linux-0cbe0064614ace61e08618948f82c6d525e75017.zip
rt2x00: Validate firmware in driver
The get_firmware_crc() callback function isn't flexible enough when dealing with multiple firmware versions. It might in some cases be possible that the firmware file contains multiple CRC checksums. Create the check_firmware() callback function where the driver has complete freedom in how to validate the firmware. Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/rt2x00/rt73usb.c')
-rw-r--r--drivers/net/wireless/rt2x00/rt73usb.c29
1 files changed, 18 insertions, 11 deletions
diff --git a/drivers/net/wireless/rt2x00/rt73usb.c b/drivers/net/wireless/rt2x00/rt73usb.c
index 24e97b341cf8..be791a43c054 100644
--- a/drivers/net/wireless/rt2x00/rt73usb.c
+++ b/drivers/net/wireless/rt2x00/rt73usb.c
@@ -1061,35 +1061,42 @@ static char *rt73usb_get_firmware_name(struct rt2x00_dev *rt2x00dev)
return FIRMWARE_RT2571;
}
-static u16 rt73usb_get_firmware_crc(const void *data, const size_t len)
+static int rt73usb_check_firmware(struct rt2x00_dev *rt2x00dev,
+ const u8 *data, const size_t len)
{
+ u16 fw_crc;
u16 crc;
/*
- * Use the crc itu-t algorithm.
+ * Only support 2kb firmware files.
+ */
+ if (len != 2048)
+ return FW_BAD_LENGTH;
+
+ /*
* The last 2 bytes in the firmware array are the crc checksum itself,
* this means that we should never pass those 2 bytes to the crc
* algorithm.
*/
+ fw_crc = (data[len - 2] << 8 | data[len - 1]);
+
+ /*
+ * Use the crc itu-t algorithm.
+ */
crc = crc_itu_t(0, data, len - 2);
crc = crc_itu_t_byte(crc, 0);
crc = crc_itu_t_byte(crc, 0);
- return crc;
+ return (fw_crc == crc) ? FW_OK : FW_BAD_CRC;
}
-static int rt73usb_load_firmware(struct rt2x00_dev *rt2x00dev, const void *data,
- const size_t len)
+static int rt73usb_load_firmware(struct rt2x00_dev *rt2x00dev,
+ const u8 *data, const size_t len)
{
unsigned int i;
int status;
u32 reg;
- if (len != 2048) {
- ERROR(rt2x00dev, "Invalid firmware file length (len=%zu)\n", len);
- return -ENOENT;
- }
-
/*
* Wait for stable hardware.
*/
@@ -2278,7 +2285,7 @@ static const struct ieee80211_ops rt73usb_mac80211_ops = {
static const struct rt2x00lib_ops rt73usb_rt2x00_ops = {
.probe_hw = rt73usb_probe_hw,
.get_firmware_name = rt73usb_get_firmware_name,
- .get_firmware_crc = rt73usb_get_firmware_crc,
+ .check_firmware = rt73usb_check_firmware,
.load_firmware = rt73usb_load_firmware,
.initialize = rt2x00usb_initialize,
.uninitialize = rt2x00usb_uninitialize,