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Patch "mtd: bcm47xxpart: don't fail because of bit-flips" has been added to the 4.4-stable tree

PATCH [email protected] 1 participant 1 message Jul 3, 2017

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This is a note to let you know that I've just added the patch titled

mtd: bcm47xxpart: don't fail because of bit-flips

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
mtd-bcm47xxpart-don-t-fail-because-of-bit-flips.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

Quoted 1 line

From 36bcc0c9c2bc8f56569cd735ba531a51358d7c2b Mon Sep 17 00:00:00 2001

From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <[email protected]>
Date: Sun, 6 Dec 2015 11:31:38 +0100
Subject: mtd: bcm47xxpart: don't fail because of bit-flips
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Rafał Miłecki <[email protected]>

commit 36bcc0c9c2bc8f56569cd735ba531a51358d7c2b upstream.

Bit-flip errors may occur on NAND flashes and are harmless. Handle them gracefully as read content is still reliable and can be parsed.

Signed-off-by Rafał Miłecki <[email protected]>
Signed-off-by Brian Norris <[email protected]>
Signed-off-by Amit Pundir <[email protected]>
Signed-off-by Greg Kroah-Hartman <[email protected]>
---
 drivers/mtd/bcm47xxpart.c |   38 ++++++++++++++++++++++----------------
 1 file changed, 22 insertions(+), 16 deletions(-)
drivers/mtd/bcm47xxpart.c +22 -16
@@ -66,11 +66,13 @@ static const char *bcm47xxpart_trx_data_
 {
 	uint32_t buf;
 	size_t bytes_read;
+	int err;
 
-	if (mtd_read(master, offset, sizeof(buf), &bytes_read,
-		     (uint8_t *)&buf) < 0) {
-		pr_err("mtd_read error while parsing (offset: 0x%X)!\n",
-			offset);
+	err  = mtd_read(master, offset, sizeof(buf), &bytes_read,
+			(uint8_t *)&buf);
+	if (err && !mtd_is_bitflip(err)) {
+		pr_err("mtd_read error while parsing (offset: 0x%X): %d\n",
+			offset, err);
 		goto out_default;
 	}
 

@@ -95,6 +97,7 @@ static int bcm47xxpart_parse(struct mtd_
 	int trx_part = -1;
 	int last_trx_part = -1;
 	int possible_nvram_sizes[] = { 0x8000, 0xF000, 0x10000, };
+	int err;
 
 	/*
 	 * Some really old flashes (like AT45DB*) had smaller erasesize-s, but

@@ -128,10 +131,11 @@ static int bcm47xxpart_parse(struct mtd_
 		}
 
 		/* Read beginning of the block */
-		if (mtd_read(master, offset, BCM47XXPART_BYTES_TO_READ,
-			     &bytes_read, (uint8_t *)buf) < 0) {
-			pr_err("mtd_read error while parsing (offset: 0x%X)!\n",
-			       offset);
+		err = mtd_read(master, offset, BCM47XXPART_BYTES_TO_READ,
+			       &bytes_read, (uint8_t *)buf);
+		if (err && !mtd_is_bitflip(err)) {
+			pr_err("mtd_read error while parsing (offset: 0x%X): %d\n",
+			       offset, err);
 			continue;
 		}
 

@@ -252,10 +256,11 @@ static int bcm47xxpart_parse(struct mtd_
 		}
 
 		/* Read middle of the block */
-		if (mtd_read(master, offset + 0x8000, 0x4,
-			     &bytes_read, (uint8_t *)buf) < 0) {
-			pr_err("mtd_read error while parsing (offset: 0x%X)!\n",
-			       offset);
+		err = mtd_read(master, offset + 0x8000, 0x4, &bytes_read,
+			       (uint8_t *)buf);
+		if (err && !mtd_is_bitflip(err)) {
+			pr_err("mtd_read error while parsing (offset: 0x%X): %d\n",
+			       offset, err);
 			continue;
 		}
 

@@ -275,10 +280,11 @@ static int bcm47xxpart_parse(struct mtd_
 		}
 
 		offset = master->size - possible_nvram_sizes[i];
-		if (mtd_read(master, offset, 0x4, &bytes_read,
-			     (uint8_t *)buf) < 0) {
-			pr_err("mtd_read error while reading at offset 0x%X!\n",
-			       offset);
+		err = mtd_read(master, offset, 0x4, &bytes_read,
+			       (uint8_t *)buf);
+		if (err && !mtd_is_bitflip(err)) {
+			pr_err("mtd_read error while reading (offset 0x%X): %d\n",
+			       offset, err);
 			continue;
 		}

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/mtd-bcm47xxpart-don-t-fail-because-of-bit-flips.patch queue-4.4/mtd-bcm47xxpart-limit-scanned-flash-area-on-bcm47xx-mips-only.patch