[PATCH 13/17] mtd: ssfdc: Replace open-coded parity calculation with parity32()

Kuan-Wei Chiu
2025-02-23T16:45:15Z

Refactor parity calculations to use the standard parity32() helper.
This change eliminates redundant implementations and improves code
efficiency.

Co-developed-by: Yu-Chun Lin <eleanor15x@gmail.com>
Signed-off-by: Yu-Chun Lin <eleanor15x@gmail.com>
Signed-off-by: Kuan-Wei Chiu <visitorckw@gmail.com>
---
drivers/mtd/ssfdc.c | 17 ++---------------
1 file changed, 2 insertions(+), 15 deletions(-)

diff --git a/drivers/mtd/ssfdc.c b/drivers/mtd/ssfdc.c
index 46c01fa2ec46..e7f9e73da644 100644
--- a/drivers/mtd/ssfdc.c
+++ b/drivers/mtd/ssfdc.c
@@ -7,6 +7,7 @@
* Based on NTFL and MTDBLOCK_RO drivers
*/

+#include <linux/bitops.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
@@ -178,20 +179,6 @@ static int read_raw_oob(struct mtd_info *mtd, loff_t offs, uint8_t *buf)
return 0;
}

-/* Parity calculator on a word of n bit size */
-static int get_parity(int number, int size)
-{
- int k;
- int parity;
-
- parity = 1;
- for (k = 0; k < size; k++) {
- parity += (number >> k);
- parity &= 1;
- }
- return parity;
-}
-
/* Read and validate the logical block address field stored in the OOB */
static int get_logical_address(uint8_t *oob_buf)
{
@@ -215,7 +202,7 @@ static int get_logical_address(uint8_t *oob_buf)
block_address &= 0x7FF;
block_address >>= 1;

- if (get_parity(block_address, 10) != parity) {
+ if (parity32(block_address & 0x3ff) == parity) {
pr_debug("SSFDC_RO: logical address field%d"
"parity error(0x%04X)\n", j+1,
block_address);
--
2.34.1