mtd: nand: brcmnand: Zero bitflip is not an error

[ 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@broadcom.com>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/mtd/nand/brcmnand/brcmnand.c b/drivers/mtd/nand/brcmnand/brcmnand.c
index 1a4a790054e4d5c89b71dc7e6559dac281fb5574..ef9a6b22c9faf493a6d379cfe9da9d1c094d16fe 100644 (file)
--- a/drivers/mtd/nand/brcmnand/brcmnand.c
+++ b/drivers/mtd/nand/brcmnand/brcmnand.c
@@ -1763,7 +1763,7 @@ static int brcmnand_read(struct mtd_info *mtd, struct nand_chip *chip,
                        err = brcmstb_nand_verify_erased_page(mtd, chip, buf,
                                                              addr);
                        /* erased page bitflips corrected */
-                       if (err > 0)
+                       if (err >= 0)
                                return err;
                }