linux-kernel - Re: [PATCH v4 6/8] mfd: make mfd_remove

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Message-ID: <20150624113144.GL15013@x1>
Date:	Wed, 24 Jun 2015 12:31:44 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	"Rafael J . Wysocki" <rjw@...ysocki.net>,
	linux-acpi@...r.kernel.org, linux-pm@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Vinod Koul <vinod.koul@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
	Mike Turquette <mturquette@...aro.org>
Subject: Re: [PATCH v4 6/8] mfd: make mfd_remove_devices() iterate in reverse
 order

On Mon, 15 Jun 2015, Andy Shevchenko wrote:

> The newly introduced device_for_each_child_reverse() would be used when MFD
> core removes the device.
> 
> After this patch applied the devices will be removed in a reversed order. This
> behaviour is useful when devices have implicit dependency on order, i.e.
> consider MFD device with serial bus controller, such as SPI, and DMA IP that is
> attached to serial bus controller: before remove the DMA driver we have to be
> ensured that no DMA transfers is ongoing and the requested channel are unused.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/mfd/mfd-core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Applied, thanks.

> diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c
> index 1aed3b7..79eeaa5 100644
> --- a/drivers/mfd/mfd-core.c
> +++ b/drivers/mfd/mfd-core.c
> @@ -300,7 +300,7 @@ void mfd_remove_devices(struct device *parent)
>  {
>  	atomic_t *cnts = NULL;
>  
> -	device_for_each_child(parent, &cnts, mfd_remove_devices_fn);
> +	device_for_each_child_reverse(parent, &cnts, mfd_remove_devices_fn);
>  	kfree(cnts);
>  }
>  EXPORT_SYMBOL(mfd_remove_devices);

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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