[PATCH v2 06/51] mtd: use mtd_ooblayout_xxx() helpers where appropriate

Boris Brezillon
2016-02-04T10:29:36Z

The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
drivers/mtd/mtdchar.c | 107 +++++++++++++++++++++++++++++++++++++++++---------
1 file changed, 88 insertions(+), 19 deletions(-)

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 6d19835..cd64ab7 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -472,28 +472,101 @@ static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
* nand_ecclayout flexibly (i.e. the struct may change size in new
* releases without requiring major rewrites).
*/
-static int shrink_ecclayout(const struct nand_ecclayout *from,
- struct nand_ecclayout_user *to)
+static int shrink_ecclayout(struct mtd_info *mtd,
+ struct nand_ecclayout_user *to)
{
- int i;
+ struct mtd_oob_region oobregion;
+ int i, section = 0, ret;

- if (!from || !to)
+ if (!mtd || !to)
return -EINVAL;

memset(to, 0, sizeof(*to));

- to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES);
- for (i = 0; i < to->eccbytes; i++)
- to->eccpos[i] = from->eccpos[i];
+ to->eccbytes = 0;
+ for (i = 0; i < MTD_MAX_ECCPOS_ENTRIES;) {
+ u32 eccpos;
+
+ ret = mtd_ooblayout_ecc(mtd, section, &oobregion);
+ if (ret < 0) {
+ if (ret != -ERANGE)
+ return ret;
+
+ break;
+ }
+
+ eccpos = oobregion.offset;
+ for (; i < MTD_MAX_ECCPOS_ENTRIES &&
+ eccpos < oobregion.offset + oobregion.length; i++) {
+ to->eccpos[i] = eccpos++;
+ to->eccbytes++;
+ }
+ }

for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
- if (from->oobfree[i].length == 0 &&
- from->oobfree[i].offset == 0)
+ ret = mtd_ooblayout_free(mtd, i, &oobregion);
+ if (ret < 0) {
+ if (ret != -ERANGE)
+ return ret;
+
+ break;
+ }
+
+ to->oobfree[i].offset = oobregion.offset;
+ to->oobfree[i].length = oobregion.length;
+ to->oobavail += to->oobfree[i].length;
+ }
+
+ return 0;
+}
+
+static int get_oobinfo(struct mtd_info *mtd, struct nand_oobinfo *to)
+{
+ struct mtd_oob_region oobregion;
+ int i, section = 0, ret;
+
+ if (!mtd || !to)
+ return -EINVAL;
+
+ memset(to, 0, sizeof(*to));
+
+ to->eccbytes = 0;
+ for (i = 0; i < ARRAY_SIZE(to->eccpos);) {
+ u32 eccpos;
+
+ ret = mtd_ooblayout_ecc(mtd, section, &oobregion);
+ if (ret < 0) {
+ if (ret != -ERANGE)
+ return ret;
+
break;
- to->oobavail += from->oobfree[i].length;
- to->oobfree[i] = from->oobfree[i];
+ }
+
+ if (oobregion.length + i > ARRAY_SIZE(to->eccpos))
+ return -EINVAL;
+
+ eccpos = oobregion.offset;
+ for (; eccpos < oobregion.offset + oobregion.length; i++) {
+ to->eccpos[i] = eccpos++;
+ to->eccbytes++;
+ }
}

+ for (i = 0; i < 8; i++) {
+ ret = mtd_ooblayout_free(mtd, i, &oobregion);
+ if (ret < 0) {
+ if (ret != -ERANGE)
+ return ret;
+
+ break;
+ }
+
+ to->oobfree[i][0] = oobregion.offset;
+ to->oobfree[i][1] = oobregion.length;
+ }
+
+ to->useecc = MTD_NANDECC_AUTOPLACE;
+
return 0;
}

@@ -817,14 +890,10 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)

if (!mtd->ecclayout)
return -EOPNOTSUPP;
- if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
- return -EINVAL;

- oi.useecc = MTD_NANDECC_AUTOPLACE;
- memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
- memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
- sizeof(oi.oobfree));
- oi.eccbytes = mtd->ecclayout->eccbytes;
+ ret = get_oobinfo(mtd, &oi);
+ if (ret)
+ return ret;

if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
return -EFAULT;
@@ -920,7 +989,7 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
if (!usrlay)
return -ENOMEM;

- shrink_ecclayout(mtd->ecclayout, usrlay);
+ shrink_ecclayout(mtd, usrlay);

if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
ret = -EFAULT;
--
2.1.4