[PATCH] mtd: rawnand: propagate BBT read transport errors

[James Hilliard <james.hilliard1@gmail.com>]

check_create() handles uncorrectable ECC errors by invalidating the
affected BBT copy and handles corrected errors by scheduling a rewrite.
Other read_abs_bbt() failures are ignored, allowing initialization to
succeed with missing entries in the RAM table or to rewrite a table that
was not completely read.

Return non-ECC read errors from both the selected table and the second
unversioned copy before updating versions or writing tables. A transport
failure does not establish that the selected table is corrupt or that an
older mirror contains all of its bad-block information. Preserve the
existing ECC-specific recovery paths.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
---
 drivers/mtd/nand/raw/nand_bbt.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/mtd/nand/raw/nand_bbt.c b/drivers/mtd/nand/raw/nand_bbt.c
index b0e7592a2ab7..93c798ac4f9e 100644
--- a/drivers/mtd/nand/raw/nand_bbt.c
+++ b/drivers/mtd/nand/raw/nand_bbt.c
@@ -1023,6 +1023,8 @@ static int check_create(struct nand_chip *this, uint8_t *buf,
 				i--;
 				continue;
 			}
+			if (res < 0 && !mtd_is_bitflip(res))
+				return res;
 		}
 		/* If they weren't versioned, read both */
 		if (rd2) {
@@ -1034,6 +1036,8 @@ static int check_create(struct nand_chip *this, uint8_t *buf,
 				i--;
 				continue;
 			}
+			if (res2 < 0 && !mtd_is_bitflip(res2))
+				return res2;
 		}
 
 		/* Scrub the flash table(s)? */

---
base-commit: 30daaf3e7897b4a8d9b72e5b0c86dd6e2a4d7d85
change-id: 20261103-submit-rawnand-bbt-read-error-v1-eacbdd1e7970

Best regards,
--  
James Hilliard <james.hilliard1@gmail.com>