[MTD] [OneNAND] Do not stop reading for ECC errors

When an ECC error occurs, the read should be completed
anyway before returning -EBADMSG.  Returning -EBADMSG
straight away is incorrect.

Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index 1b0b320..ed9f9c0 100644 (file)
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -855,6 +855,8 @@ static int onenand_read_ops_nolock(struct mtd_info *mtd, loff_t from,
                        this->command(mtd, ONENAND_CMD_READ, from, writesize);
                        ret = this->wait(mtd, FL_READING);
                        onenand_update_bufferram(mtd, from, !ret);
+                       if (ret == -EBADMSG)
+                               ret = 0;
                }
        }
 
@@ -913,6 +915,8 @@ static int onenand_read_ops_nolock(struct mtd_info *mtd, loff_t from,
                /* Now wait for load */
                ret = this->wait(mtd, FL_READING);
                onenand_update_bufferram(mtd, from, !ret);
+               if (ret == -EBADMSG)
+                       ret = 0;
        }
 
        /*
@@ -923,12 +927,12 @@ static int onenand_read_ops_nolock(struct mtd_info *mtd, loff_t from,
        ops->retlen = read;
        ops->oobretlen = oobread;
 
-       if (mtd->ecc_stats.failed - stats.failed)
-               return -EBADMSG;
-
        if (ret)
                return ret;
 
+       if (mtd->ecc_stats.failed - stats.failed)
+               return -EBADMSG;
+
        return mtd->ecc_stats.corrected - stats.corrected ? -EUCLEAN : 0;
 }
 
@@ -944,6 +948,7 @@ static int onenand_read_oob_nolock(struct mtd_info *mtd, loff_t from,
                        struct mtd_oob_ops *ops)
 {
        struct onenand_chip *this = mtd->priv;
+       struct mtd_ecc_stats stats;
        int read = 0, thislen, column, oobsize;
        size_t len = ops->ooblen;
        mtd_oob_mode_t mode = ops->mode;
@@ -977,6 +982,8 @@ static int onenand_read_oob_nolock(struct mtd_info *mtd, loff_t from,
                return -EINVAL;
        }
 
+       stats = mtd->ecc_stats;
+
        while (read < len) {
                cond_resched();
 
@@ -988,18 +995,16 @@ static int onenand_read_oob_nolock(struct mtd_info *mtd, loff_t from,
                onenand_update_bufferram(mtd, from, 0);
 
                ret = this->wait(mtd, FL_READING);
-               /* First copy data and check return value for ECC handling */
+               if (ret && ret != -EBADMSG) {
+                       printk(KERN_ERR "onenand_read_oob_nolock: read failed = 0x%x\n", ret);
+                       break;
+               }
 
                if (mode == MTD_OOB_AUTO)
                        onenand_transfer_auto_oob(mtd, buf, column, thislen);
                else
                        this->read_bufferram(mtd, ONENAND_SPARERAM, buf, column, thislen);
 
-               if (ret) {
-                       printk(KERN_ERR "onenand_read_oob_nolock: read failed = 0x%x\n", ret);
-                       break;
-               }
-
                read += thislen;
 
                if (read == len)
@@ -1016,7 +1021,14 @@ static int onenand_read_oob_nolock(struct mtd_info *mtd, loff_t from,
        }
 
        ops->oobretlen = read;
-       return ret;
+
+       if (ret)
+               return ret;
+
+       if (mtd->ecc_stats.failed - stats.failed)
+               return -EBADMSG;
+
+       return 0;
 }
 
 /**