Re: [Nbd] [PATCH 5/6] block: dasd_genhd: convert to blkdev_reread_part

[Ming Lei <ming.lei@...1301...>]

On Mon, Apr 6, 2015 at 9:51 PM, Jarod Wilson <jarod@...696...> wrote:
>>
>> Note: patch 6/6 in the series makes this whole while() loops pointless,
>> since the possibility of the -EBUSY return goes away.
>
> Minor clarification: the -EBUSY due to the trylock, which is why that
> retry loop exists, goes away. You *could* still get an -EBUSY through
> blkdev_reread_part()->rescan_partitions()->drop_partitions() if
> bdev->bd_part_count is non-zero.

Not like trylock(&bd_mutex), Inside kernel, it should be driver's
responsibility to avoid that before rescanning partitions, that said
retry may not be needed for this case.

Thanks,