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rt2x00: Move firmware checksumming to driver

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rt2x00lib depended on 2 crc algorithms because rt61/rt73
use a different algorithm then rt2800. This means that
even when only 1 algorithm was needed, the dependency was
still present for both.
By moving the checksum generation to the driver we can clean
up 2 annoying flags (which indicated which checksum was required)
and move the dependency to where it belongs: the driver.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Ivo van Doorn
2008-03-09 22:44:54 +01:00
committed by John W. Linville
parent 5f46c4d053
commit a7f3a06cbb
5 changed files with 50 additions and 47 deletions
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34
drivers/net/wireless/rt2x00/rt2x00firmware.c
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@@ -23,8 +23,6 @@
Abstract: rt2x00 firmware loading routines.
*/
#include <linux/crc-ccitt.h>
#include <linux/crc-itu-t.h>
#include <linux/kernel.h>
#include <linux/module.h>
@@ -63,36 +61,7 @@ static int rt2x00lib_request_firmware(struct rt2x00_dev *rt2x00dev)
return -ENOENT;
}
/*
* Perform crc validation on the firmware.
* 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.
*/
if (test_bit(DRIVER_REQUIRE_FIRMWARE_CRC_ITU_T, &rt2x00dev->flags)) {
/*
* Use the crc itu-t algorithm.
* Use 0 for the last 2 bytes to complete the checksum.
*/
crc = crc_itu_t(0, fw->data, fw->size - 2);
crc = crc_itu_t_byte(crc, 0);
crc = crc_itu_t_byte(crc, 0);
} else if (test_bit(DRIVER_REQUIRE_FIRMWARE_CCITT, &rt2x00dev->flags)) {
/*
* Use the crc ccitt algorithm.
* This will return the same value as the legacy driver which
* used bit ordering reversion on the both the firmware bytes
* before input input as well as on the final output.
* Obviously using crc ccitt directly is much more efficient.
*/
crc = crc_ccitt(~0, fw->data, fw->size - 2);
} else {
ERROR(rt2x00dev, "No checksum algorithm selected "
"for firmware validation.\n");
retval = -ENOENT;
goto exit;
}
crc = rt2x00dev->ops->lib->get_firmware_crc(fw->data, fw->size);
if (crc != (fw->data[fw->size - 2] << 8 | fw->data[fw->size - 1])) {
ERROR(rt2x00dev, "Firmware checksum error.\n");
retval = -ENOENT;
@@ -139,4 +108,3 @@ void rt2x00lib_free_firmware(struct rt2x00_dev *rt2x00dev)
release_firmware(rt2x00dev->fw);
rt2x00dev->fw = NULL;
}