Patch "mtd: nand: omap: fix BCHx ecc.correct to return detected bit-flips in erased-page" has been added to the 3.10-stable tree

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

    mtd: nand: omap: fix BCHx ecc.correct to return detected bit-flips in erased-page

to the 3.10-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-nand-omap-fix-bchx-ecc.correct-to-return-detected-bit-flips-in-erased-page.patch
and it can be found in the queue-3.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From f306e8c3b667632952f1a4a74ffb910bbc06255f Mon Sep 17 00:00:00 2001
From: pekon gupta <pekon@xxxxxx>
Date: Thu, 20 Mar 2014 18:49:58 +0530
Subject: mtd: nand: omap: fix BCHx ecc.correct to return detected bit-flips in erased-page

From: pekon gupta <pekon@xxxxxx>

commit f306e8c3b667632952f1a4a74ffb910bbc06255f upstream.

fixes: commit 62116e5171e00f85a8d53f76e45b84423c89ff34
       mtd: nand: omap2: Support for hardware BCH error correction.

In omap_elm_correct_data(), if bitflip_count in an erased-page is within the
correctable limit (< ecc.strength), then it is not indicated back to the caller
ecc->read_page().

This mis-guides upper layers like MTD and UBIFS layer to assume erased-page as
perfectly clean and use it for writing even if actual bitflip_count was
dangerously high (bitflip_count > mtd->bitflip_threshold).

This patch fixes this above issue, by returning 'stats' to caller
ecc->read_page() under all scenarios.

Reported-by: Brian Norris <computersforpeace@xxxxxxxxx>
Signed-off-by: Pekon Gupta <pekon@xxxxxx>
Signed-off-by: Brian Norris <computersforpeace@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/mtd/nand/omap2.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1463,7 +1463,7 @@ static int omap_elm_correct_data(struct
 
 	/* Check if any error reported */
 	if (!is_error_reported)
-		return 0;
+		return stat;
 
 	/* Decode BCH error using ELM module */
 	elm_decode_bch_error_page(info->elm_dev, ecc_vec, err_vec);


Patches currently in stable-queue which might be from pekon@xxxxxx are

queue-3.10/mtd-nand-omap-fix-bchx-ecc.correct-to-return-detected-bit-flips-in-erased-page.patch
queue-3.10/mtd-elbc-nand-fix-subpage-write-support.patch
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