linux-kernel - Re: [PATCH 1/2] driver-core: allow asynchronous device shutdown

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Message-ID: <20140508190307.GA6766@kroah.com>
Date:	Thu, 8 May 2014 21:03:07 +0200
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Keith Busch <keith.busch@...el.com>
Cc:	linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] driver-core: allow asynchronous device shutdown

On Thu, May 08, 2014 at 12:07:33PM -0600, Keith Busch wrote:
> A patch to allow .shutdown to execute asynchronously. Some devices may
> take a long time to complete a shutdown, so this patch lets a driver
> safely shutdown multiple devices asynchronously.
> 
> This uses an exclusive asynchronous domain so other unrelated async
> tasks can't cause shutdown to hold up indefinitely.
> 
> Signed-off-by: Keith Busch <keith.busch@...el.com>
> ---
>  drivers/base/core.c    |    4 ++++
>  include/linux/device.h |    1 +
>  2 files changed, 5 insertions(+)
> 
> diff --git a/drivers/base/core.c b/drivers/base/core.c
> index 20da3ad..71b83bb 100644
> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -10,6 +10,7 @@
>   *
>   */
>  
> +#include <linux/async.h>
>  #include <linux/device.h>
>  #include <linux/err.h>
>  #include <linux/init.h>
> @@ -1926,6 +1927,8 @@ out:
>  }
>  EXPORT_SYMBOL_GPL(device_move);
>  
> +ASYNC_DOMAIN_EXCLUSIVE(shutdown_domain);
> +EXPORT_SYMBOL(shutdown_domain);

EXPORT_SYMBOL_GPL() please, for driver core functions.

thanks,

greg k-h
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