mtd: nand: scrub BBT on ECC errors

[pandora-kernel.git] / drivers / mtd / nand / nand_bbt.c

diff --git a/drivers/mtd/nand/nand_bbt.c b/drivers/mtd/nand/nand_bbt.c
index 0ed8591..11185aa 100644 (file)
--- a/drivers/mtd/nand/nand_bbt.c
+++ b/drivers/mtd/nand/nand_bbt.c
@@ -882,7 +882,7 @@ static inline int nand_memory_bbt(struct mtd_info *mtd, struct nand_bbt_descr *b
  */
 static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd)
 {
-       int i, chips, writeops, create, chipsel, res;
+       int i, chips, writeops, create, chipsel, res, res2;
        struct nand_chip *this = mtd->priv;
        struct nand_bbt_descr *td = this->bbt_td;
        struct nand_bbt_descr *md = this->bbt_md;
@@ -899,6 +899,7 @@ static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_desc
                create = 0;
                rd = NULL;
                rd2 = NULL;
+               res = res2 = 0;
                /* Per chip or per device? */
                chipsel = (td->options & NAND_BBT_PERCHIP) ? i : -1;
                /* Mirrored table available? */
@@ -951,11 +952,29 @@ static int check_create(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_desc
                }
 
                /* Read back first? */
-               if (rd)
-                       read_abs_bbt(mtd, buf, rd, chipsel);
+               if (rd) {
+                       res = read_abs_bbt(mtd, buf, rd, chipsel);
+                       if (mtd_is_eccerr(res)) {
+                               /* Mark table as invalid */
+                               rd->pages[i] = -1;
+                               i--;
+                               continue;
+                       }
+               }
                /* If they weren't versioned, read both */
-               if (rd2)
-                       read_abs_bbt(mtd, buf, rd2, chipsel);
+               if (rd2) {
+                       res2 = read_abs_bbt(mtd, buf, rd2, chipsel);
+                       if (mtd_is_eccerr(res2)) {
+                               /* Mark table as invalid */
+                               rd2->pages[i] = -1;
+                               i--;
+                               continue;
+                       }
+               }
+
+               /* Scrub the flash table(s)? */
+               if (mtd_is_bitflip(res) || mtd_is_bitflip(res2))
+                       writeops = 0x03;
 
                /* Write the bad block table to the device? */
                if ((writeops & 0x01) && (td->options & NAND_BBT_WRITE)) {