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yaml
---
r: 311867
b: refs/heads/master
c: 021796b
h: refs/heads/master
i:
  311865: 5d68a9f
  311863: 2a91d65
v: v3
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Mike Dunn authored and David Woodhouse committed Jul 6, 2012
1 parent 5658791 commit 7f2e1bc
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2 changes: 1 addition & 1 deletion [refs]
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---
refs/heads/master: 6023813a2d5949ba368e7df464f2ccb649719777
refs/heads/master: 021796b892dcad45743f3196e3eef7222870dd55
17 changes: 9 additions & 8 deletions trunk/Documentation/ABI/testing/sysfs-class-mtd
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Expand Up @@ -142,13 +142,14 @@ KernelVersion: 3.4
Contact: linux-mtd@lists.infradead.org
Description:
This allows the user to examine and adjust the criteria by which
mtd returns -EUCLEAN from mtd_read(). If the maximum number of
bit errors that were corrected on any single region comprising
an ecc step (as reported by the driver) equals or exceeds this
value, -EUCLEAN is returned. Otherwise, absent an error, 0 is
returned. Higher layers (e.g., UBI) use this return code as an
indication that an erase block may be degrading and should be
scrutinized as a candidate for being marked as bad.
mtd returns -EUCLEAN from mtd_read() and mtd_read_oob(). If the
maximum number of bit errors that were corrected on any single
region comprising an ecc step (as reported by the driver) equals
or exceeds this value, -EUCLEAN is returned. Otherwise, absent
an error, 0 is returned. Higher layers (e.g., UBI) use this
return code as an indication that an erase block may be
degrading and should be scrutinized as a candidate for being
marked as bad.

The initial value may be specified by the flash device driver.
If not, then the default value is ecc_strength.
Expand All @@ -167,7 +168,7 @@ Description:
block degradation, but high enough to avoid the consequences of
a persistent return value of -EUCLEAN on devices where sticky
bitflips occur. Note that if bitflip_threshold exceeds
ecc_strength, -EUCLEAN is never returned by mtd_read().
ecc_strength, -EUCLEAN is never returned by the read operations.
Conversely, if bitflip_threshold is zero, -EUCLEAN is always
returned, absent a hard error.

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