[MTD] NAND: Fix breakage all over the place

Following problems are addressed:

- wrong status caused early break out of nand_wait()
- removed the bogus status check in nand_wait() which
  is a relict of the abandoned support for interrupted
  erase.
- status check moved to the correct place in read_oob
- oob support for syndrom based ecc with strange layouts
- use given offset in the AUTOOOB based oob operations

Partially based on a patch from Vitaly Vool <vwool@ru.mvista.com>
Thanks to Savin Zlobec <savin@epico.si> for tracking down the
status problem.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

drivers/mtd/mtdchar.c

@@ -504,12 +504,12 @@ static int mtd_ioctl(struct inode *inode, struct file *file,
 			return ret;
 
 		ops.len = buf.length;
-		ops.ooblen = mtd->oobsize;
+		ops.ooblen = buf.length;
 		ops.ooboffs = buf.start & (mtd->oobsize - 1);
 		ops.datbuf = NULL;
 		ops.mode = MTD_OOB_PLACE;
 
-		if (ops.ooboffs && ops.len > (ops.ooblen - ops.ooboffs))
+		if (ops.ooboffs && ops.len > (mtd->oobsize - ops.ooboffs))
 			return -EINVAL;
 
 		ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
@@ -553,12 +553,12 @@ static int mtd_ioctl(struct inode *inode, struct file *file,
 			return ret;
 
 		ops.len = buf.length;
-		ops.ooblen = mtd->oobsize;
+		ops.ooblen = buf.length;
 		ops.ooboffs = buf.start & (mtd->oobsize - 1);
 		ops.datbuf = NULL;
 		ops.mode = MTD_OOB_PLACE;
 
-		if (ops.ooboffs && ops.len > (ops.ooblen - ops.ooboffs))
+		if (ops.ooboffs && ops.len > (mtd->oobsize - ops.ooboffs))
 			return -EINVAL;
 
 		ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);

drivers/mtd/nand/diskonchip.c

@@ -464,7 +464,7 @@ static void __init doc2000_count_chips(struct mtd_info *mtd)
 	printk(KERN_DEBUG "Detected %d chips per floor.\n", i);
 }
 
-static int doc200x_wait(struct mtd_info *mtd, struct nand_chip *this, int state)
+static int doc200x_wait(struct mtd_info *mtd, struct nand_chip *this)
 {
 	struct doc_priv *doc = this->priv;