[PATCH] mtd: blkdevs: Fix mtd block write failure

[Abhishek Sahu]

On 2017-08-03 20:40, Boris Brezillon wrote:
> On Wed,  2 Aug 2017 18:03:05 +0530
> Abhishek Sahu <absahu at codeaurora.org> wrote:
> 
>> All the MTD block write requests are failing with
>> following error messages
>> 
>>     mkfs.ext4  /dev/mtdblock0
>> 
>>     print_req_error: I/O error, dev mtdblock0, sector 0
>>     Buffer I/O error on dev mtdblock0, logical block 0,
>>     lost async page write
>> 
>> The control is going to default case after block write request
>> because of missing return.
>> 
>> Fixes: commit 2a842acab109 ("block: introduce new block status code 
>> type")
>> Signed-off-by: Abhishek Sahu <absahu at codeaurora.org>
> 
> Acked-by: Boris Brezillon <boris.brezillon at free-electrons.com>
> 

  Shall this patch be included for next RC since the MTD block
  write is broken in 4.13 and without this, all the writes to
  MTD block device will return failure.

>> ---
>>  drivers/mtd/mtd_blkdevs.c | 1 +
>>  1 file changed, 1 insertion(+)
>> 
>> diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
>> index f336a9b..9ec8f03 100644
>> --- a/drivers/mtd/mtd_blkdevs.c
>> +++ b/drivers/mtd/mtd_blkdevs.c
>> @@ -113,6 +113,7 @@ static blk_status_t do_blktrans_request(struct 
>> mtd_blktrans_ops *tr,
>>  		for (; nsect > 0; nsect--, block++, buf += tr->blksize)
>>  			if (tr->writesect(dev, block, buf))
>>  				return BLK_STS_IOERR;
>> +		return BLK_STS_OK;
>>  	default:
>>  		return BLK_STS_IOERR;
>>  	}