linux-kernel - Re: [PATCH v2 5/5] fpga: region: return NOTIFY

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Date:   Thu, 7 Dec 2017 15:27:28 -0800
From:   Moritz Fischer <mdf@...nel.org>
To:     Alan Tull <atull@...nel.org>
Cc:     Moritz Fischer <mdf@...nel.org>, linux-kernel@...r.kernel.org,
        linux-fpga@...r.kernel.org
Subject: Re: [PATCH v2 5/5] fpga: region: return NOTIFY_STOP if overlay shoud
 be accepted

On Wed, Nov 15, 2017 at 02:51:52PM -0600, Alan Tull wrote:
> Recent changes to the Device Tree overlay notifier code have changed
> how notifier return codes are interpreted, requiring a NOTIFY_STOP to
> signal that the overlay should be accepted.  This commit makes the
> appropriate change to the FPGA region's Device Tree overlay notifier.
> 
> Fixes: 24789c5ce5a3 ("of: overlay: detect cases where device tree may become corrupt")
> Signed-off-by: Alan Tull <atull@...nel.org>
Reviewed-by: Moritz Fischer <mdf@...nel.org>
> ---
> v2: Added in v2 of this patchset.  Tested on linux-next/master.
> ---
>  drivers/fpga/of-fpga-region.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/fpga/of-fpga-region.c b/drivers/fpga/of-fpga-region.c
> index 276ffe2..a0c13cb 100644
> --- a/drivers/fpga/of-fpga-region.c
> +++ b/drivers/fpga/of-fpga-region.c
> @@ -349,7 +349,8 @@ static void of_fpga_region_notify_post_remove(struct fpga_region *region,
>   * This notifier handles programming a FPGA when a "firmware-name" property is
>   * added to a fpga-region.
>   *
> - * Returns NOTIFY_OK or error if FPGA programming fails.
> + * Returns NOTIFY_OK if this notification isn't about this region or
> + * NOTIFY_STOP if the overaly is to be accepted or error if FPGA programming fails.
>   */
>  static int of_fpga_region_notify(struct notifier_block *nb,
>  				 unsigned long action, void *arg)
> @@ -395,7 +396,7 @@ static int of_fpga_region_notify(struct notifier_block *nb,
>  	if (ret)
>  		return notifier_from_errno(ret);
>  
> -	return NOTIFY_OK;
> +	return NOTIFY_STOP;
>  }
>  
>  static struct notifier_block fpga_region_of_nb = {
> -- 
> 2.7.4
> 

Thanks,

Moritz

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