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authorSascha Hauer <s.hauer@pengutronix.de>2017-03-29 16:27:01 +0200
committerSascha Hauer <s.hauer@pengutronix.de>2017-03-31 18:43:53 +0200
commit9d6d91931afb8f038a58d18471dccd65bdd95cfd (patch)
tree4c4521a0e5896269e826e2fff1456d89a512c080
parentccb5b80125a0b95e8954260eddd7f40a61c8e65e (diff)
downloadbarebox-9d6d91931afb8f038a58d18471dccd65bdd95cfd.tar.gz
state: Remove -EUCLEAN check from userspace tool
The state code is used for the userspace tool aswell, kept in sync manually. This patch only introduces a change for the userspace tool, not for barebox. In Linux userspace there is no direct possibility to check for -EUCLEAN. To indirectly check for -EUCLEAN the state tool reads the number of corrected bits before and after reading a block. Unfortunately it does not take the number of acceptable bitflips into account, but instead returns -EUCLEAN even when only a single bitflip occurred on a whole page. To be correct the algorithm must be more complicated: We would have to read the bitflip_threshold from sysfs. This value is per ECC step (often 512 byte), not per page. We would have to read the page in ECC step size chunks, testing for bitflips lower than the threshold for each chunk. Even if we would do that, there's still another issue. The eccstats ioctl delivers the eccstats for the whole device, so a concurrent reader would falsify the result. Let's decide that this is not worth the hassle and assume that no device has enough uptime that a cleanup in barebox is not sufficient. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
-rw-r--r--common/state/backend_bucket_circular.c21
1 files changed, 0 insertions, 21 deletions
diff --git a/common/state/backend_bucket_circular.c b/common/state/backend_bucket_circular.c
index d99ba39..5279ec9 100644
--- a/common/state/backend_bucket_circular.c
+++ b/common/state/backend_bucket_circular.c
@@ -171,33 +171,12 @@ static int state_mtd_peb_read(struct state_backend_storage_bucket_circular *circ
dev_dbg(circ->dev, "Read state from %ld length %zd\n", offset,
len);
- ret = ioctl(circ->fd, ECCGETSTATS, &stat1);
- if (ret)
- nostats = true;
ret = read_full(circ->fd, buf, len);
if (ret < 0) {
dev_err(circ->dev, "Failed to read circular storage len %zd, %d\n",
len, ret);
free(buf);
- return ret;
- }
-
- if (nostats)
- return 0;
-
- ret = ioctl(circ->fd, ECCGETSTATS, &stat2);
- if (ret)
- return 0;
-
- if (stat2.failed - stat1.failed > 0) {
- ret = -EUCLEAN;
- dev_dbg(circ->dev, "PEB %u has ECC error, forcing rewrite\n",
- circ->eraseblock);
- } else if (stat2.corrected - stat1.corrected > 0) {
- ret = -EUCLEAN;
- dev_dbg(circ->dev, "PEB %u is unclean, forcing rewrite\n",
- circ->eraseblock);
}
return ret;