mtd: nand: check the return code of 'read_oob/read_oob_raw'

Apparently, there is an implementor of 'read_oob' which may return an
error inidication (e.g. docg4_read_oob may return -EIO).

Test the return value of 'read_oob/read_oob_raw', and if negative,
propagate the error, so it's returned by the '_read_oob' interface.

Signed-off-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 4047d7c..d47586c 100644 (file)
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -1791,6 +1791,7 @@ static int nand_do_read_oob(struct mtd_info *mtd, loff_t from,
        int readlen = ops->ooblen;
        int len;
        uint8_t *buf = ops->oobbuf;
+       int ret = 0;
 
        pr_debug("%s: from = 0x%08Lx, len = %i\n",
                        __func__, (unsigned long long)from, readlen);
@@ -1826,9 +1827,12 @@ static int nand_do_read_oob(struct mtd_info *mtd, loff_t from,
 
        while (1) {
                if (ops->mode == MTD_OPS_RAW)
-                       chip->ecc.read_oob_raw(mtd, chip, page);
+                       ret = chip->ecc.read_oob_raw(mtd, chip, page);
                else
-                       chip->ecc.read_oob(mtd, chip, page);
+                       ret = chip->ecc.read_oob(mtd, chip, page);
+
+               if (ret < 0)
+                       break;
 
                len = min(len, readlen);
                buf = nand_transfer_oob(chip, buf, ops, len);
@@ -1857,7 +1861,10 @@ static int nand_do_read_oob(struct mtd_info *mtd, loff_t from,
                }
        }
 
-       ops->oobretlen = ops->ooblen;
+       ops->oobretlen = ops->ooblen - readlen;
+
+       if (ret < 0)
+               return ret;
 
        if (mtd->ecc_stats.failed - stats.failed)
                return -EBADMSG;