linux-kernel - [PATCH 21/31] mtd: use parity16 in ssfdc.c

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Message-ID: <56F78ACB.1010402@gmail.com>
Date:	Sun, 27 Mar 2016 15:24:59 +0800
From:	"zhaoxiu.zeng" <zhaoxiu.zeng@...il.com>
To:	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org
Subject: [PATCH 21/31] mtd: use parity16 in ssfdc.c

From: Zeng Zhaoxiu <zhaoxiu.zeng@...il.com>

Signed-off-by: Zeng Zhaoxiu <zhaoxiu.zeng@...il.com>
---
 drivers/mtd/ssfdc.c | 20 ++------------------
 1 file changed, 2 insertions(+), 18 deletions(-)

diff --git a/drivers/mtd/ssfdc.c b/drivers/mtd/ssfdc.c
index daf82ba..b4d9144 100644
--- a/drivers/mtd/ssfdc.c
+++ b/drivers/mtd/ssfdc.c
@@ -182,24 +182,10 @@ 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)
 {
-	int block_address, parity;
+	int block_address;
 	int offset[2] = {6, 11}; /* offset of the 2 address fields within OOB */
 	int j;
 	int ok = 0;
@@ -215,11 +201,9 @@ static int get_logical_address(uint8_t *oob_buf)
 
 		/* Check for the signature bits in the address field (MSBits) */
 		if ((block_address & ~0x7FF) == 0x1000) {
-			parity = block_address & 0x01;
 			block_address &= 0x7FF;
-			block_address >>= 1;
 
-			if (get_parity(block_address, 10) != parity) {
+			if (!parity16(block_address)) {
 				pr_debug("SSFDC_RO: logical address field%d"
 					"parity error(0x%04X)\n", j+1,
 					block_address);
-- 
2.5.5