4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Albert Hsieh <wen.hs...@broadcom.com>


[ 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.hs...@broadcom.com>
Acked-by: Boris Brezillon <boris.brezil...@free-electrons.com>
Signed-off-by: Richard Weinberger <rich...@nod.at>
Signed-off-by: Sasha Levin <alexander.le...@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 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;
                }
 


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