linux-kernel - [PATCH 3.16 088/306] UBI: fastmap: scrub PEB when bitflips are detected in a free PEB EC header

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Message-ID: <lsq.1487198500.638465577@decadent.org.uk>
Date:   Wed, 15 Feb 2017 22:41:40 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Boris Brezillon" <boris.brezillon@...e-electrons.com>,
        "Richard Weinberger" <richard@....at>
Subject: [PATCH 3.16 088/306] UBI: fastmap: scrub PEB when bitflips are
 detected in a free PEB EC header

3.16.40-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Boris Brezillon <boris.brezillon@...e-electrons.com>

commit ecbfa8eabae9cd73522d1d3d15869703c263d859 upstream.

scan_pool() does not mark the PEB for scrubing when bitflips are
detected in the EC header of a free PEB (VID header region left to
0xff).
Make sure we scrub the PEB in this case.

Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
Fixes: dbb7d2a88d2a ("UBI: Add fastmap core")
Signed-off-by: Richard Weinberger <richard@....at>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/mtd/ubi/fastmap.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/drivers/mtd/ubi/fastmap.c
+++ b/drivers/mtd/ubi/fastmap.c
@@ -445,10 +445,11 @@ static int scan_pool(struct ubi_device *
 			unsigned long long ec = be64_to_cpu(ech->ec);
 			unmap_peb(ai, pnum);
 			dbg_bld("Adding PEB to free: %i", pnum);
+
 			if (err == UBI_IO_FF_BITFLIPS)
-				add_aeb(ai, free, pnum, ec, 1);
-			else
-				add_aeb(ai, free, pnum, ec, 0);
+				scrub = 1;
+
+			add_aeb(ai, free, pnum, ec, scrub);
 			continue;
 		} else if (err == 0 || err == UBI_IO_BITFLIPS) {
 			dbg_bld("Found non empty PEB:%i in pool", pnum);