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240181fd0f
linux/drivers/mtd/nand
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Brian Norris 240181fd0f mtd: nand: default bitflip-reporting threshold to 75% of correction strength 
The MTD API reports -EUCLEAN only if the maximum number of bitflips
found in any ECC block exceeds a certain threshold. This is done to
avoid excessive -EUCLEAN reports to MTD users, which may induce
additional scrubbing of data, even when the ECC algorithm in use is
perfectly capable of handling the bitflips.

This threshold can be controlled by user-space (via sysfs), to allow
users to determine what they are willing to tolerate in their
application. But it still helps to have sane defaults.

In recent discussion [1], it was pointed out that our default threshold
is equal to the correction strength. That means that we won't actually
report any -EUCLEAN (i.e., "bitflips were corrected") errors until there
are almost too many to handle. It was determined that 3/4 of the
correction strength is probably a better default.

[1] http://lists.infradead.org/pipermail/linux-mtd/2015-January/057259.html

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Huang Shijie <shijie.huang@intel.com>
2015-01-20 23:43:18 -08:00
..
bcm47xxnflash mtd: nand: bcm47xxnflash: drop owner assignment from platform_drivers 2014-10-20 16:20:58 +02:00
gpmi-nand mtd: nand: gpmi: remove deprecated comment 2014-12-22 12:58:24 -08:00
ams-delta.c mtd: nand: ams-delta: fix overwritten mtd_info->owner in initialization 2015-01-15 19:33:03 -08:00
atmel_nand_ecc.h mtd: atmel_nand: make PMECC lookup table and offset property optional 2014-11-05 14:44:25 -08:00
atmel_nand_nfc.h mtd: atmel_nand: add NFC status error check 2014-07-21 20:02:01 -07:00
atmel_nand.c mtd: atmel_nand: introduce a new compatible string for sama5d4 chip 2015-01-20 12:47:01 -08:00
au1550nd.c mtd: nand: drop owner assignment from platform_drivers 2014-10-20 16:20:58 +02:00
bf5xx_nand.c mtd: nand: drop owner assignment from platform_drivers 2014-10-20 16:20:58 +02:00
cafe_nand.c mtd: cafe_nand: drop duplicate .write_page implementation 2014-11-25 23:13:38 -08:00
cmx270_nand.c mtd: cmx270_nand: Remove unnecessary OOM messages 2014-01-03 11:22:29 -08:00
cs553x_nand.c mtd: cs553x_nand: Remove unnecessary OOM messages 2014-01-03 11:22:29 -08:00
davinci_nand.c mtd: nand: drop owner assignment from platform_drivers 2014-10-20 16:20:58 +02:00
denali_dt.c mtd: nand: drop owner assignment from platform_drivers 2014-10-20 16:20:58 +02:00
denali_pci.c mtd: denali: Drop print of build date/time 2014-01-09 08:52:48 -08:00
denali.c mtd: denali: fix incorrect bitmask error in denali_setup_dma 2015-01-13 02:32:08 -08:00
denali.h mtd: denali: fix include guard and license block of denali.h 2014-09-17 23:32:30 -07:00
diskonchip.c mtd: diskonchip: mem resource name is not optional 2014-03-31 18:43:22 -07:00
docg4.c mtd: nand: drop owner assignment from platform_drivers 2014-10-20 16:20:58 +02:00
fsl_elbc_nand.c mtd: nand: drop owner assignment from platform_drivers 2014-10-20 16:20:58 +02:00
fsl_ifc_nand.c MTD updates for 3.19: 2014-12-17 09:59:26 -08:00
fsl_upm.c mtd: nand: drop owner assignment from platform_drivers 2014-10-20 16:20:58 +02:00
fsmc_nand.c mtd: nand: drop owner assignment from platform_drivers 2014-10-20 16:20:58 +02:00
gpio.c MTD updates for 3.19: 2014-12-17 09:59:26 -08:00
jz4740_nand.c mtd: nand: drop owner assignment from platform_drivers 2014-10-20 16:20:58 +02:00
Kconfig mtd: nand: gpio: improve comments about GPIO assisted operation 2014-11-04 23:53:07 -08:00
lpc32xx_mlc.c mtd: nand: drop owner assignment from platform_drivers 2014-10-20 16:20:58 +02:00
lpc32xx_slc.c mtd: nand: drop owner assignment from platform_drivers 2014-10-20 16:20:58 +02:00
Makefile mtd: nand: add sunxi NAND flash controller support 2014-10-29 10:08:00 -07:00
mpc5121_nfc.c mtd: nand: drop owner assignment from platform_drivers 2014-10-20 16:20:58 +02:00
mxc_nand.c MTD updates for 3.19: 2014-12-17 09:59:26 -08:00
nand_base.c mtd: nand: default bitflip-reporting threshold to 75% of correction strength 2015-01-20 23:43:18 -08:00
nand_bbt.c mtd: nand: don't break long print messages 2014-09-17 23:29:36 -07:00
nand_bch.c
nand_ecc.c mtd: nand: add line feed to pr_err 2014-04-16 00:18:26 -07:00
nand_ids.c mtd: nand: add ATO manufacturer info 2014-11-25 20:11:12 -08:00
nand_timings.c mtd: nand: Use ULL-suffix for big u64 constant 2014-08-19 11:53:09 -07:00
nandsim.c nandsim: remove unused STATE_DATAOUT_STATUS_M and OPT_SMARTMEDIA 2015-01-15 19:37:20 -08:00
ndfc.c mtd: nand: drop owner assignment from platform_drivers 2014-10-20 16:20:58 +02:00
nuc900_nand.c mtd: nand: drop owner assignment from platform_drivers 2014-10-20 16:20:58 +02:00
omap2.c MTD updates for 3.19: 2014-12-17 09:59:26 -08:00
omap_elm.c Merge branch 'platform/remove_owner' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux into driver-core-next 2014-11-03 19:53:56 -08:00
orion_nand.c MTD updates for 3.19: 2014-12-17 09:59:26 -08:00
pasemi_nand.c mtd: nand: drop owner assignment from platform_drivers 2014-10-20 16:20:58 +02:00
plat_nand.c mtd: nand: drop owner assignment from platform_drivers 2014-10-20 16:20:58 +02:00
pxa3xx_nand.c mtd: pxa3xx_nand: make the driver work on big-endian systems 2014-05-28 13:27:37 -07:00
r852.c mtd: nand: r852: correct write_buf loop bounds 2014-05-28 00:05:26 -07:00
r852.h
s3c2410.c mtd: nand: drop owner assignment from platform_drivers 2014-10-20 16:20:58 +02:00
sh_flctl.c mtd: nand: drop owner assignment from platform_drivers 2014-10-20 16:20:58 +02:00
sharpsl.c mtd: nand: drop owner assignment from platform_drivers 2014-10-20 16:20:58 +02:00
sm_common.c mtd: nand: refactor chip->block_markbad interface 2013-08-30 16:47:52 +01:00
sm_common.h mtd: use __packed shorthand 2014-08-19 11:53:08 -07:00
socrates_nand.c mtd: nand: drop owner assignment from platform_drivers 2014-10-20 16:20:58 +02:00
sunxi_nand.c mtd: nand: add sunxi NAND flash controller support 2014-10-29 10:08:00 -07:00
tmio_nand.c mtd: tmio_nand: Use devm_*() functions 2014-01-03 11:22:28 -08:00
txx9ndfmc.c mtd: nand: drop owner assignment from platform_drivers 2014-10-20 16:20:58 +02:00
xway_nand.c mtd: lantiq: Add NAND support on Lantiq XWAY SoC. 2012-09-29 15:05:18 +01:00