diff options
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/inftlcore.c | 7 | ||||
| -rw-r--r-- | drivers/mtd/mtdchar.c | 5 | ||||
| -rw-r--r-- | drivers/mtd/mtdconcat.c | 15 | ||||
| -rw-r--r-- | drivers/mtd/nand/nand_base.c | 5 | ||||
| -rw-r--r-- | drivers/mtd/nftlcore.c | 6 |
5 files changed, 29 insertions, 9 deletions
diff --git a/drivers/mtd/inftlcore.c b/drivers/mtd/inftlcore.c index efb1a95aa0a..1e21a2c3dd2 100644 --- a/drivers/mtd/inftlcore.c +++ b/drivers/mtd/inftlcore.c @@ -355,7 +355,7 @@ static u16 INFTL_foldchain(struct INFTLrecord *inftl, unsigned thisVUC, unsigned ret = mtd->read(mtd, (inftl->EraseSize * BlockMap[block]) + (block * SECTORSIZE), SECTORSIZE, &retlen, movebuf); - if (ret < 0) { + if (ret < 0 && ret != -EUCLEAN) { ret = mtd->read(mtd, (inftl->EraseSize * BlockMap[block]) + (block * SECTORSIZE), SECTORSIZE, @@ -922,7 +922,10 @@ foundit: } else { size_t retlen; loff_t ptr = (thisEUN * inftl->EraseSize) + blockofs; - if (mtd->read(mtd, ptr, SECTORSIZE, &retlen, buffer)) + int ret = mtd->read(mtd, ptr, SECTORSIZE, &retlen, buffer); + + /* Handle corrected bit flips gracefully */ + if (ret < 0 && ret != -EUCLEAN) return -EIO; } return 0; diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c index 7522fc3a282..a48210d58b9 100644 --- a/drivers/mtd/mtdchar.c +++ b/drivers/mtd/mtdchar.c @@ -199,10 +199,13 @@ static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t /* Nand returns -EBADMSG on ecc errors, but it returns * the data. For our userspace tools it is important * to dump areas with ecc errors ! + * For kernel internal usage it also might return -EUCLEAN + * to signal the caller that a bitflip has occured and has + * been corrected by the ECC algorithm. * Userspace software which accesses NAND this way * must be aware of the fact that it deals with NAND */ - if (!ret || (ret == -EBADMSG)) { + if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) { *ppos += retlen; if (copy_to_user(buf, kbuf, retlen)) { kfree(kbuf); diff --git a/drivers/mtd/mtdconcat.c b/drivers/mtd/mtdconcat.c index 38151b8e663..3c8d5e6fa01 100644 --- a/drivers/mtd/mtdconcat.c +++ b/drivers/mtd/mtdconcat.c @@ -56,7 +56,7 @@ concat_read(struct mtd_info *mtd, loff_t from, size_t len, size_t * retlen, u_char * buf) { struct mtd_concat *concat = CONCAT(mtd); - int err = -EINVAL; + int ret = 0, err = -EINVAL; int i; *retlen = 0; @@ -80,9 +80,18 @@ concat_read(struct mtd_info *mtd, loff_t from, size_t len, err = subdev->read(subdev, from, size, &retsize, buf); - if (err) + if (err && (err != -EBADMSG) && (err != -EUCLEAN)) break; + /* Save information about bitflips! */ + if (err) { + if (err == -EBADMSG) + ret = err; + else if (!ret) + ret = err; + err = 0; + } + *retlen += retsize; len -= size; if (len == 0) @@ -92,7 +101,7 @@ concat_read(struct mtd_info *mtd, loff_t from, size_t len, buf += size; from = 0; } - return err; + return err ? err : ret; } static int diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index b8e6e1579cf..7a3a4490771 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -1035,7 +1035,10 @@ static int nand_do_read_ops(struct mtd_info *mtd, loff_t from, if (ret) return ret; - return mtd->ecc_stats.failed - stats.failed ? -EBADMSG : 0; + if (mtd->ecc_stats.failed - stats.failed) + return -EBADMSG; + + return mtd->ecc_stats.corrected - stats.corrected ? -EUCLEAN : 0; } /** diff --git a/drivers/mtd/nftlcore.c b/drivers/mtd/nftlcore.c index f6ffe7949b2..dc7573501d8 100644 --- a/drivers/mtd/nftlcore.c +++ b/drivers/mtd/nftlcore.c @@ -422,7 +422,7 @@ static u16 NFTL_foldchain (struct NFTLrecord *nftl, unsigned thisVUC, unsigned p ret = mtd->read(mtd, (nftl->EraseSize * BlockMap[block]) + (block * 512), 512, &retlen, movebuf); - if (ret < 0) { + if (ret < 0 && ret != -EUCLEAN) { ret = mtd->read(mtd, (nftl->EraseSize * BlockMap[block]) + (block * 512), 512, &retlen, movebuf); @@ -768,7 +768,9 @@ static int nftl_readblock(struct mtd_blktrans_dev *mbd, unsigned long block, } else { loff_t ptr = (lastgoodEUN * nftl->EraseSize) + blockofs; size_t retlen; - if (mtd->read(mtd, ptr, 512, &retlen, buffer)) + int res = mtd->read(mtd, ptr, 512, &retlen, buffer); + + if (res < 0 && res != -EUCLEAN) return -EIO; } return 0; |