mtd: nand: read_page() returns max_bitflips

The ecc.read_page() method for nand drivers is changed to return the maximum
number of bitflips that were corrected on any one region covering an ecc step,
This patch doesn't change what the nand code returns to mtd.

This v2 includes the change to the fsl_ifc_nand driver requested by Scott¹.

¹ http://lists.infradead.org/pipermail/linux-mtd/2012-April/040883.html

Signed-off-by: Mike Dunn <mikedunn@newsguy.com>
Acked-by (freescale changes): Scott Wood <scottwood@freescale.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/mtd/nand/docg4.c b/drivers/mtd/nand/docg4.c
index b08202664543..8e7da0170a2b 100644
--- a/drivers/mtd/nand/docg4.c
+++ b/drivers/mtd/nand/docg4.c
@@ -720,6 +720,7 @@ static int read_page(struct mtd_info *mtd, struct nand_chip *nand,
         struct docg4_priv *doc = nand->priv;
         void __iomem *docptr = doc->virtadr;
         uint16_t status, edc_err, *buf16;
+        int bits_corrected = 0;
 
         dev_dbg(doc->dev, "%s: page %08x\n", __func__, page);
 
@@ -772,7 +773,7 @@ static int read_page(struct mtd_info *mtd, struct nand_chip *nand,
 
                 /* If bitflips are reported, attempt to correct with ecc */
                 if (edc_err & DOC_ECCCONF1_BCH_SYNDROM_ERR) {
-                        int bits_corrected = correct_data(mtd, buf, page);
+                        bits_corrected = correct_data(mtd, buf, page);
                         if (bits_corrected == -EBADMSG)
                                 mtd->ecc_stats.failed++;
                         else
@@ -781,7 +782,7 @@ static int read_page(struct mtd_info *mtd, struct nand_chip *nand,
         }
 
         writew(0, docptr + DOC_DATAEND);
-        return 0;
+        return bits_corrected;
 }