linux-kernel - [PATCH v2] mtdblock: tolerate corrected bit-flips

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Message-Id: <20230328163012.4264-1-libang.linuxer@gmail.com>
Date:   Wed, 29 Mar 2023 00:30:12 +0800
From:   Bang Li <libang.linuxer@...il.com>
To:     miquel.raynal@...tlin.com, richard@....at, vigneshr@...com
Cc:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Bang Li <libang.linuxer@...il.com>, stable@...r.kernel.org
Subject: [PATCH v2] mtdblock: tolerate corrected bit-flips

mtd_read() may return -EUCLEAN in case of corrected bit-flips.This
particular condition should not be treated like an error.

Signed-off-by: Bang Li <libang.linuxer@...il.com>
Fixes: e47f68587b82 ("mtd: check for max_bitflips in mtd_read_oob()")
Cc: <stable@...r.kernel.org> # v3.7
---
Changes since v1:
- Resend this patch with Cc and Fixes tags
---
 drivers/mtd/mtdblock.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/mtdblock.c b/drivers/mtd/mtdblock.c
index 1e94e7d10b8b..a0a1194dc1d9 100644
--- a/drivers/mtd/mtdblock.c
+++ b/drivers/mtd/mtdblock.c
@@ -153,7 +153,7 @@ static int do_cached_write (struct mtdblk_dev *mtdblk, unsigned long pos,
 				mtdblk->cache_state = STATE_EMPTY;
 				ret = mtd_read(mtd, sect_start, sect_size,
 					       &retlen, mtdblk->cache_data);
-				if (ret)
+				if (ret && !mtd_is_bitflip(ret))
 					return ret;
 				if (retlen != sect_size)
 					return -EIO;
@@ -188,8 +188,12 @@ static int do_cached_read (struct mtdblk_dev *mtdblk, unsigned long pos,
 	pr_debug("mtdblock: read on \"%s\" at 0x%lx, size 0x%x\n",
 			mtd->name, pos, len);
 
-	if (!sect_size)
-		return mtd_read(mtd, pos, len, &retlen, buf);
+	if (!sect_size) {
+		ret = mtd_read(mtd, pos, len, &retlen, buf);
+		if (ret && !mtd_is_bitflip(ret))
+			return ret;
+		return 0;
+	}
 
 	while (len > 0) {
 		unsigned long sect_start = (pos/sect_size)*sect_size;
@@ -209,7 +213,7 @@ static int do_cached_read (struct mtdblk_dev *mtdblk, unsigned long pos,
 			memcpy (buf, mtdblk->cache_data + offset, size);
 		} else {
 			ret = mtd_read(mtd, pos, size, &retlen, buf);
-			if (ret)
+			if (ret && !mtd_is_bitflip(ret))
 				return ret;
 			if (retlen != size)
 				return -EIO;
-- 
2.25.1