[MTD] NAND Signal that a bitflip was corrected by ECC
Return -EUCLEAN on read when a bitflip was detected and corrected, so the
clients can react and eventually copy the affected block to a spare one.
Make all in kernel users aware of the change.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/fs/jffs2/wbuf.c b/fs/jffs2/wbuf.c
index 1195d06d..a7f153f 100644
--- a/fs/jffs2/wbuf.c
+++ b/fs/jffs2/wbuf.c
@@ -296,10 +296,11 @@
/* Do the read... */
ret = c->mtd->read(c->mtd, start, c->wbuf_ofs - start, &retlen, buf);
- if (ret == -EBADMSG && retlen == c->wbuf_ofs - start) {
- /* ECC recovered */
+ /* ECC recovered ? */
+ if ((ret == -EUCLEAN || ret == -EBADMSG) &&
+ (retlen == c->wbuf_ofs - start))
ret = 0;
- }
+
if (ret || retlen != c->wbuf_ofs - start) {
printk(KERN_CRIT "Old data are already lost in wbuf recovery. Data loss ensues.\n");
@@ -908,20 +909,21 @@
down_read(&c->wbuf_sem);
ret = c->mtd->read(c->mtd, ofs, len, retlen, buf);
- if ( (ret == -EBADMSG) && (*retlen == len) ) {
- printk(KERN_WARNING "mtd->read(0x%zx bytes from 0x%llx) returned ECC error\n",
- len, ofs);
+ if ( (ret == -EBADMSG || ret == -EUCLEAN) && (*retlen == len) ) {
+ if (ret == -EBADMSG)
+ printk(KERN_WARNING "mtd->read(0x%zx bytes from 0x%llx)"
+ " returned ECC error\n", len, ofs);
/*
- * We have the raw data without ECC correction in the buffer, maybe
- * we are lucky and all data or parts are correct. We check the node.
- * If data are corrupted node check will sort it out.
- * We keep this block, it will fail on write or erase and the we
- * mark it bad. Or should we do that now? But we should give him a chance.
- * Maybe we had a system crash or power loss before the ecc write or
- * a erase was completed.
+ * We have the raw data without ECC correction in the buffer,
+ * maybe we are lucky and all data or parts are correct. We
+ * check the node. If data are corrupted node check will sort
+ * it out. We keep this block, it will fail on write or erase
+ * and the we mark it bad. Or should we do that now? But we
+ * should give him a chance. Maybe we had a system crash or
+ * power loss before the ecc write or a erase was completed.
* So we return success. :)
*/
- ret = 0;
+ ret = 0;
}
/* if no writebuffer available or write buffer empty, return */
@@ -943,7 +945,7 @@
orbf = (c->wbuf_ofs - ofs); /* offset in read buffer */
if (orbf > len) /* is write beyond write buffer ? */
goto exit;
- lwbf = len - orbf; /* number of bytes to copy */
+ lwbf = len - orbf; /* number of bytes to copy */
if (lwbf > c->wbuf_len)
lwbf = c->wbuf_len;
}