linux-kernel - Re: [RFC v2 6/6] pata_marvell: use async probe

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Message-ID: <20140905071535.GA9323@mtj.dyndns.org>
Date:	Fri, 5 Sep 2014 16:15:35 +0900
From:	Tejun Heo <tj@...nel.org>
To:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
Cc:	gregkh@...uxfoundation.org, dmitry.torokhov@...il.com,
	falcon@...zu.com, tiwai@...e.de, arjan@...ux.intel.com,
	linux-kernel@...r.kernel.org, oleg@...hat.com, hare@...e.com,
	akpm@...ux-foundation.org, penguin-kernel@...ove.sakura.ne.jp,
	joseph.salisbury@...onical.com, bpoirier@...e.de,
	santosh@...lsio.com, "Luis R. Rodriguez" <mcgrof@...e.com>,
	linux-ide@...r.kernel.org,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	patrakov@...il.com
Subject: Re: [RFC v2 6/6] pata_marvell: use async probe

On Thu, Sep 04, 2014 at 11:37:27PM -0700, Luis R. Rodriguez wrote:
> diff --git a/drivers/ata/pata_marvell.c b/drivers/ata/pata_marvell.c
> index ae9feb1..6a543b9 100644
> --- a/drivers/ata/pata_marvell.c
> +++ b/drivers/ata/pata_marvell.c
> @@ -175,6 +175,7 @@ static struct pci_driver marvell_pci_driver = {
>  	.suspend		= ata_pci_device_suspend,
>  	.resume			= ata_pci_device_resume,
>  #endif
> +	.driver.async_probe = true,

You can't do this.  There's nothing special about pata_marvell.  Sure
there was a bug report which made long probe durations more common on
this driver on certain configurations but those long durations can
happen on *any* libata driver and singling out pata_marvell for async
probing is adding a different probing behavior basically arbitrarily.
I really can't see how this marking random drivers with async probing
would work, so one driver does synchronous probing while the
equivalent next one doesn't?  That's crazy.

Thanks.

-- 
tejun
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