4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Albert Hsieh <wen.hsieh@xxxxxxxxxxxx>
[ Upstream commit e44b9a9c135727f3410e029910275f40681dc8bc ]
A negative return value of brcmstb_nand_verify_erased_page() indicates a
real bitflip error of an erased page, and other return values (>= 0) show
the corrected bitflip number. Zero return value means no bitflip, but the
current driver code treats it as an error, and eventually leads to
falsely reported ECC error.
Fixes: 02b88eea9f9c ("mtd: brcmnand: Add check for erased page bitflip")
Signed-off-by: Albert Hsieh <wen.hsieh@xxxxxxxxxxxx>
Acked-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Richard Weinberger <richard@xxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mtd/nand/brcmnand/brcmnand.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/mtd/nand/brcmnand/brcmnand.c
+++ b/drivers/mtd/nand/brcmnand/brcmnand.c
@@ -1763,7 +1763,7 @@ try_dmaread:
err = brcmstb_nand_verify_erased_page(mtd, chip, buf,
addr);
/* erased page bitflips corrected */
- if (err > 0)
+ if (err >= 0)
return err;
}