[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>

1 files changed, 17 insertions, 15 deletions

diff --git a/fs/jffs2/wbuf.c b/fs/jffs2/wbuf.c
index 1195d06d4373..a7f153f79ecb 100644
--- a/fs/jffs2/wbuf.c
+++ b/fs/jffs2/wbuf.c
@@ -296,10 +296,11 @@ static void jffs2_wbuf_recover(struct jffs2_sb_info *c)
                 /* 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 @@ int jffs2_flash_read(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *re
         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 @@ int jffs2_flash_read(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *re
                 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;
         }