[PATCH RESEND stable 4.9] mtd: rawnand: brcmnand: Fixed incorrect sub-page ECC status

[Florian Fainelli]

On 2/23/2022 9:54 AM, Greg KH wrote:
> On Wed, Feb 23, 2022 at 09:44:31AM -0800, Florian Fainelli wrote:
>> From: david regan <dregan at mail.com>
>>
>> commit 36415a7964711822e63695ea67fede63979054d9 upstream
>>
>> The brcmnand driver contains a bug in which if a page (example 2k byte)
>> is read from the parallel/ONFI NAND and within that page a subpage (512
>> byte) has correctable errors which is followed by a subpage with
>> uncorrectable errors, the page read will return the wrong status of
>> correctable (as opposed to the actual status of uncorrectable.)
>>
>> The bug is in function brcmnand_read_by_pio where there is a check for
>> uncorrectable bits which will be preempted if a previous status for
>> correctable bits is detected.
>>
>> The fix is to stop checking for bad bits only if we already have a bad
>> bits status.
>>
>> Fixes: 27c5b17cd1b1 ("mtd: nand: add NAND driver "library" for Broadcom STB NAND controller")
>> Signed-off-by: david regan <dregan at mail.com>
>> Reviewed-by: Florian Fainelli <f.fainelli at gmail.com>
>> Signed-off-by: Miquel Raynal <miquel.raynal at bootlin.com>
>> Link: https://lore.kernel.org/linux-mtd/trinity-478e0c09-9134-40e8-8f8c-31c371225eda-1643237024774@3c-app-mailcom-lxa02
>> [florian: make patch apply to 4.14, file was renamed]
>> Signed-off-by: Florian Fainelli <f.fainelli at gmail.com>
>> ---
>>   drivers/mtd/nand/brcmnand/brcmnand.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Why is this a RESEND?  What happened with the first set?

I forgot to copy stable and you and Sasha, wanted to make it clear to 
the MTD folks why this is being resent.
-- 
Florian