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[MTD] [OneNAND] Allow for controller errors when reading

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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.

Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
Adrian Hunter 2008-04-14 09:39:39 +03:00 committed by David Woodhouse
parent f1ebe4eba4
commit 67e5a28b35
1 changed files with 15 additions and 0 deletions
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15
drivers/mtd/onenand/onenand_base.c
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@ -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;
}