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mtd: pxa3xx_nand: Fix blank page ECC mismatch

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This bug was introduced in f8155a40 ("mtd: pxa3xx_nand: rework irq
logic") and causes the PXA3xx NAND controller fail to operate with NAND
flash that has empty pages. According to the comment in this block, the
hardware controller will report a double-bit error for empty pages,
which can and must be ignored.

This patch restores the original behaviour of the driver.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Acked-by: Lei Wen <leiwen@marvell.com>
Cc: Haojian Zhuang <haojian.zhuang@marvell.com>
Cc: David Woodhouse <David.Woodhouse@intel.com>
Cc: stable@kernel.org [2.6.38+]
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
This commit is contained in:
Daniel Mack 2011-06-07 03:01:07 -07:00 committed by Artem Bityutskiy
parent 0fab028b77
commit 543e32d5ff
1 changed files with 2 additions and 0 deletions
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2
drivers/mtd/nand/pxa3xx_nand.c
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@ -685,6 +685,8 @@ static int pxa3xx_nand_read_page_hwecc(struct mtd_info *mtd,
* OOB, ignore such double bit errors
*/
if (is_buf_blank(buf, mtd->writesize))
info->retcode = ERR_NONE;
else
mtd->ecc_stats.failed++;
}