Patchwork [5/5] UBI: always re-read in case of read failures

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Submitter Artem Bityutskiy
Date Feb. 6, 2011, 5:39 p.m.
Message ID <1297013953-28886-6-git-send-email-dedekind1@gmail.com>
Download mbox | patch
Permalink /patch/82058/
State New
Headers show

Comments

Artem Bityutskiy - Feb. 6, 2011, 5:39 p.m.
From: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

When the read operation fails, UBI tries to re-read several times in
a hope that one of the subsequent reads may succeed. However, currently
UBI re-reads only if MTD failed to read all data, but does not re-reads
if all the data were read, but with an integrity error (-EBADMSB). This
patch makes UBI to always re-try reading.

This should be useful for reading NAND pages with unstable bits -
re-reading may help to get correct data.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
---
 drivers/mtd/ubi/io.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

Patch

diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c
index 6f90a65..889e25c 100644
--- a/drivers/mtd/ubi/io.c
+++ b/drivers/mtd/ubi/io.c
@@ -188,7 +188,7 @@  retry:
 			return UBI_IO_BITFLIPS;
 		}
 
-		if (read != len && retries++ < UBI_IO_RETRIES) {
+		if (retries++ < UBI_IO_RETRIES) {
 			dbg_io("error %d%s while reading %d bytes from PEB %d:%d,"
 			       " read only %zd bytes, retry",
 			       err, errstr, len, pnum, offset, read);