Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus

[linux-2.6] / drivers / mtd / onenand / onenand_base.c

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index 8d7d21be1541867aca5a494b3965d49c6316c0bd..5d7965f7e9ce6a3f8232a53cb2c0e2a243f13379 100644 (file)
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -329,6 +329,21 @@ static int onenand_wait(struct mtd_info *mtd, int state)
                printk(KERN_ERR "onenand_wait: controller error = 0x%04x\n", ctrl);
                if (ctrl & ONENAND_CTRL_LOCK)
                        printk(KERN_ERR "onenand_wait: it's locked error.\n");
+               if (state == FL_READING) {
+                       /*
+                        * A power loss while writing can result in a page
+                        * becoming unreadable.  When the device is mounted
+                        * again, reading that page gives controller errors.
+                        * Upper level software like JFFS2 treat -EIO as fatal,
+                        * refusing to mount at all.  That means it is necessary
+                        * to treat the error as an ECC error to allow recovery.
+                        * Note that typically in this case, the eraseblock can
+                        * still be erased and rewritten i.e. it has not become
+                        * a bad block.
+                        */
+                       mtd->ecc_stats.failed++;
+                       return -EBADMSG;
+               }
                return -EIO;
        }
 
@@ -1336,7 +1351,7 @@ static int onenand_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
        }
 
        /* Reject writes, which are not page aligned */
-        if (unlikely(NOTALIGNED(to)) || unlikely(NOTALIGNED(len))) {
+        if (unlikely(NOTALIGNED(to) || NOTALIGNED(len))) {
                 printk(KERN_ERR "onenand_panic_write: Attempt to write not page aligned data\n");
                 return -EINVAL;
         }
@@ -1466,7 +1481,7 @@ static int onenand_write_ops_nolock(struct mtd_info *mtd, loff_t to,
        }
 
        /* Reject writes, which are not page aligned */
-        if (unlikely(NOTALIGNED(to)) || unlikely(NOTALIGNED(len))) {
+        if (unlikely(NOTALIGNED(to) || NOTALIGNED(len))) {
                 printk(KERN_ERR "onenand_write_ops_nolock: Attempt to write not page aligned data\n");
                 return -EINVAL;
         }
@@ -2052,7 +2067,7 @@ static int onenand_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
  *
  * Check lock status
  */
-static void onenand_check_lock_status(struct onenand_chip *this)
+static int onenand_check_lock_status(struct onenand_chip *this)
 {
        unsigned int value, block, status;
        unsigned int end;
@@ -2070,9 +2085,13 @@ static void onenand_check_lock_status(struct onenand_chip *this)
 
                /* Check lock status */
                status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
-               if (!(status & ONENAND_WP_US))
+               if (!(status & ONENAND_WP_US)) {
                        printk(KERN_ERR "block = %d, wp status = 0x%x\n", block, status);
+                       return 0;
+               }
        }
+
+       return 1;
 }
 
 /**
@@ -2081,9 +2100,11 @@ static void onenand_check_lock_status(struct onenand_chip *this)
  *
  * Unlock all blocks
  */
-static int onenand_unlock_all(struct mtd_info *mtd)
+static void onenand_unlock_all(struct mtd_info *mtd)
 {
        struct onenand_chip *this = mtd->priv;
+       loff_t ofs = 0;
+       size_t len = this->chipsize;
 
        if (this->options & ONENAND_HAS_UNLOCK_ALL) {
                /* Set start block address */
@@ -2099,23 +2120,19 @@ static int onenand_unlock_all(struct mtd_info *mtd)
                    & ONENAND_CTRL_ONGO)
                        continue;
 
+               /* Check lock status */
+               if (onenand_check_lock_status(this))
+                       return;
+
                /* Workaround for all block unlock in DDP */
                if (ONENAND_IS_DDP(this)) {
-                       /* 1st block on another chip */
-                       loff_t ofs = this->chipsize >> 1;
-                       size_t len = mtd->erasesize;
-
-                       onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_UNLOCK);
+                       /* All blocks on another chip */
+                       ofs = this->chipsize >> 1;
+                       len = this->chipsize >> 1;
                }
-
-               onenand_check_lock_status(this);
-
-               return 0;
        }
 
-       onenand_do_lock_cmd(mtd, 0x0, this->chipsize, ONENAND_CMD_UNLOCK);
-
-       return 0;
+       onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_UNLOCK);
 }
 
 #ifdef CONFIG_MTD_ONENAND_OTP