This is a note to let you know that I've just added the patch titled
mtd: eLBC NAND: fix subpage write support
to the 3.14-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-elbc-nand-fix-subpage-write-support.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f034d87def51f026b735d1e2877e9387011b2ba3 Mon Sep 17 00:00:00 2001
From: Pekon Gupta <pekon@xxxxxx>
Date: Tue, 6 May 2014 09:41:32 +0530
Subject: mtd: eLBC NAND: fix subpage write support
From: Pekon Gupta <pekon@xxxxxx>
commit f034d87def51f026b735d1e2877e9387011b2ba3 upstream.
As subpage write is enabled by default for all drivers, nand_write_subpage_hwecc
causes a crash if the driver did not register ecc->hwctl or ecc->calculate.
This behavior was introduced in
commit 837a6ba4f3b6d23026674e6af6b6849a4634fff9
"mtd: nand: subpage write support for hardware based ECC schemes".
This fixes a crash by emulating subpage write support by padding sub-page data
with 0xff on either sides to make it full page compatible.
Reported-by: Helmut Schaa <helmut.schaa@xxxxxxxxxxxxxx>
Tested-by: Helmut Schaa <helmut.schaa@xxxxxxxxxxxxxx>
Signed-off-by: Pekon Gupta <pekon@xxxxxx>
Reviewed-by: Scott Wood <scottwood@xxxxxxxxxxxxx>
Signed-off-by: Brian Norris <computersforpeace@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mtd/nand/fsl_elbc_nand.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
--- a/drivers/mtd/nand/fsl_elbc_nand.c
+++ b/drivers/mtd/nand/fsl_elbc_nand.c
@@ -724,6 +724,19 @@ static int fsl_elbc_write_page(struct mt
return 0;
}
+/* ECC will be calculated automatically, and errors will be detected in
+ * waitfunc.
+ */
+static int fsl_elbc_write_subpage(struct mtd_info *mtd, struct nand_chip *chip,
+ uint32_t offset, uint32_t data_len,
+ const uint8_t *buf, int oob_required)
+{
+ fsl_elbc_write_buf(mtd, buf, mtd->writesize);
+ fsl_elbc_write_buf(mtd, chip->oob_poi, mtd->oobsize);
+
+ return 0;
+}
+
static int fsl_elbc_chip_init(struct fsl_elbc_mtd *priv)
{
struct fsl_lbc_ctrl *ctrl = priv->ctrl;
@@ -762,6 +775,7 @@ static int fsl_elbc_chip_init(struct fsl
chip->ecc.read_page = fsl_elbc_read_page;
chip->ecc.write_page = fsl_elbc_write_page;
+ chip->ecc.write_subpage = fsl_elbc_write_subpage;
/* If CS Base Register selects full hardware ECC then use it */
if ((in_be32(&lbc->bank[priv->bank].br) & BR_DECC) ==
Patches currently in stable-queue which might be from pekon@xxxxxx are
queue-3.14/mtd-nand-omap-fix-bchx-ecc.correct-to-return-detected-bit-flips-in-erased-page.patch
queue-3.14/mtd-elbc-nand-fix-subpage-write-support.patch
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