On Tue, Nov 26, 2013 at 3:53 PM, Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
> On Tue, Nov 26, 2013 at 1:29 PM, Josh Hunt <joshhunt00@xxxxxxxxx> wrote:
>>
>> Both ahci and sata_svw call ata_host_activate(), which call
>> ata_host_register() and async_schedule(async_port_probe, ap).
>
> Well, with the modern logic ("only wait for async probing if the
> module itself did async probing") the ahci and svw modules didn't
> really change any behavior.
>
> But other modules did. I wonder, for example, if people insmod the dm
> module, and expect all devices to exist afterwards. Which the old
> logic of "we always wait for all async code regardless of whether we
> started it ourselves" would do, but the new logic does not.
>
> Something similar might hit the (non-modular) md auto-detect ioctl.
>
> So maybe we should just special-case those two issues, and say "let's
> just wait for async requests here"
>
> Something like the appended (whitespace-damaged) diff. Does that make
> a difference to you guys? And if it does, can you check *which* of the
> two async_synchronize_full() calls it is that matters for your cases?
>
> Linus
>
> --- duh, apply by hand --
>
> diff --git a/drivers/md/dm.c b/drivers/md/dm.c
> index 0704c523a76b..7e7a2f743b11 100644
> --- a/drivers/md/dm.c
> +++ b/drivers/md/dm.c
> @@ -351,6 +351,7 @@ static int __init dm_init(void)
> goto bad;
> }
>
> + async_synchronize_full();
> return 0;
>
> bad:
> diff --git a/drivers/md/md.c b/drivers/md/md.c
> index b6b7a2866c9e..1d173dc662fc 100644
> --- a/drivers/md/md.c
> +++ b/drivers/md/md.c
> @@ -8602,6 +8602,7 @@ static void autostart_arrays(int part)
> i_scanned = 0;
> i_passed = 0;
>
> + async_synchronize_full();
> printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
>
> while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
I should have clarified that I'm not using dm/md in my setup. I know
the modules are getting loaded in the log I attached, but root is not
a md/dm device.
--
Josh
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