A power loss while writing can result in a page becoming unreadable.
When the device is mounted again, reading that page gives controller
errors. Upper level software like JFFS2 treat -EIO as fatal, refusing to
mount at all. That means it is necessary to treat the error as an ECC
error to allow recovery. Note that typically in this case, the
eraseblock can still be erased and rewritten i.e. it has not become a
bad block.
Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This patch adds a proper prototype for onenand_bbt_read_oob() in
include/linux/mtd/onenand.h
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Implement the panic_write function for the onenand driver. This waits
for any active command to complete/timeout, performs the write, waits
for it to complete and then returns.
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
In function onenand_verify_oob, local variable oobbuf shall be unsigned char.
In the case of a value is >= 0x80, it's unequal in comparing the value in an unsigned char and signed char.
Signed-off-by: Sheng Yongjie (Sam) <samsheng@trident.com.cn>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Consolidate OneNAND operation order as OneNAND Spec.
It also doesn't break previous operation order.
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
When an ECC error occurs, the read should be completed
anyway before returning -EBADMSG. Returning -EBADMSG
straight away is incorrect.
Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Correct kernel-doc notation and descriptions.
Correct other typos.
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
When the erase callback performs some other action on the flash, it's
highly likely to deadlock unless we actually release the chip lock
before calling it.
This patch mirrors that same change already done for NAND.
Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This patch make the OneNAND driver much less racy. It fixes
our "onenand_wait: read timeout!" heisenbugs. The reason of
these bugs was that the driver did not lock the chip when
accessing OTP, and it screwed up OneNAND state when the OTP
was read while JFFS2 was doing FS checking.
This patch also fixes other races I spotted:
1. BBT was not protected
2. Access to ecc_stats was not protected
Now the chip is locked when BBT is accessed.
To fix all of these I basically split all interface functions
on 'function()' and 'function_nolock()' parts.
I tested this patch on N800 hardware - it fixes our problems.
But I tested a little different version because our OneNAND
codebase is slightly out-of-date. But it should be OK.
This patch also includes the prin fixes I posted before.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
To enable the main read/write at oob ops
Next time we will commit the main read/write support for yaffs2
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This patch makes the needlessly global struct info static.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
The whole point of a sim is that it should run almost anywhere.
Gratuitously depending on '#define SZ_128K 131072' from an ARM-specific
header isn't really a good idea.
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
