From 491ed06f334955578f0c43d298c46ea1a7ea9e1b Mon Sep 17 00:00:00 2001 From: Brian Norris Date: Fri, 22 Jun 2012 16:35:44 -0700 Subject: [PATCH] mtd: nand_bbt: use string library Some nand_bbt code can be shortened by using memcmp() and memchr_inv(). As an added bonus, there is a possible performance benefit. Borrowed some code from Akinobu Mita. Signed-off-by: Brian Norris Signed-off-by: Artem Bityutskiy Signed-off-by: David Woodhouse --- drivers/mtd/nand/nand_bbt.c | 27 +++++++++------------------ 1 file changed, 9 insertions(+), 18 deletions(-) diff --git a/drivers/mtd/nand/nand_bbt.c b/drivers/mtd/nand/nand_bbt.c index e23115b..f5839f0 100644 --- a/drivers/mtd/nand/nand_bbt.c +++ b/drivers/mtd/nand/nand_bbt.c @@ -68,6 +68,7 @@ #include #include #include +#include static int check_pattern_no_oob(uint8_t *buf, struct nand_bbt_descr *td) { @@ -89,19 +90,16 @@ static int check_pattern_no_oob(uint8_t *buf, struct nand_bbt_descr *td) */ static int check_pattern(uint8_t *buf, int len, int paglen, struct nand_bbt_descr *td) { - int i, end = 0; + int end = 0; uint8_t *p = buf; if (td->options & NAND_BBT_NO_OOB) return check_pattern_no_oob(buf, td); end = paglen + td->offs; - if (td->options & NAND_BBT_SCANEMPTY) { - for (i = 0; i < end; i++) { - if (p[i] != 0xff) - return -1; - } - } + if (td->options & NAND_BBT_SCANEMPTY) + if (memchr_inv(p, 0xff, end)) + return -1; p += end; /* Compare the pattern */ @@ -111,10 +109,8 @@ static int check_pattern(uint8_t *buf, int len, int paglen, struct nand_bbt_desc if (td->options & NAND_BBT_SCANEMPTY) { p += td->len; end += td->len; - for (i = end; i < len; i++) { - if (*p++ != 0xff) - return -1; - } + if (memchr_inv(p, 0xff, len - end)) + return -1; } return 0; } @@ -130,14 +126,9 @@ static int check_pattern(uint8_t *buf, int len, int paglen, struct nand_bbt_desc */ static int check_short_pattern(uint8_t *buf, struct nand_bbt_descr *td) { - int i; - uint8_t *p = buf; - /* Compare the pattern */ - for (i = 0; i < td->len; i++) { - if (p[td->offs + i] != td->pattern[i]) - return -1; - } + if (memcmp(buf + td->offs, td->pattern, td->len)) + return -1; return 0; } -- 2.7.4