linux-kernel - Re: [RFC PATCH 3/6] of: iommu: Increment DT node refcount in of_iommu_set

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Date:	Thu, 28 Jan 2016 17:15:23 +0000
From:	Robin Murphy <robin.murphy@....com>
To:	Anup Patel <anup.patel@...adcom.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Joerg Roedel <joro@...tes.org>,
	Will Deacon <will.deacon@....com>,
	Robin Murphy <Robin.Murphy@....com>,
	Sricharan R <sricharan@...eaurora.org>,
	Linux IOMMU <iommu@...ts.linux-foundation.org>,
	Linux ARM Kernel <linux-arm-kernel@...ts.infradead.org>
Cc:	Mark Rutland <mark.rutland@....com>,
	Device Tree <devicetree@...r.kernel.org>,
	Scott Branden <sbranden@...adcom.com>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Ray Jui <rjui@...adcom.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Vikram Prakash <vikramp@...adcom.com>,
	Rob Herring <robh+dt@...nel.org>,
	BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
	Kumar Gala <galak@...eaurora.org>
Subject: Re: [RFC PATCH 3/6] of: iommu: Increment DT node refcount in
 of_iommu_set_ops()

On 27/01/16 05:21, Anup Patel wrote:
> We are saving pointer to iommu DT node in of_iommu_set_ops()
> hence we should increment DT node ref count.

Oh man, shame on whoever wrote that code! :P

Reviewed-by: Robin Murphy <robin.murphy@....com>

> Signed-off-by: Anup Patel <anup.patel@...adcom.com>
> Reviewed-by: Ray Jui <rjui@...adcom.com>
> Reviewed-by: Scott Branden <sbranden@...adcom.com>
> ---
>   drivers/iommu/of_iommu.c | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
> index 60ba238..5fea665 100644
> --- a/drivers/iommu/of_iommu.c
> +++ b/drivers/iommu/of_iommu.c
> @@ -110,6 +110,7 @@ void of_iommu_set_ops(struct device_node *np, struct iommu_ops *ops)
>   	if (WARN_ON(!iommu))
>   		return;
>
> +	of_node_get(np);
>   	INIT_LIST_HEAD(&iommu->list);
>   	iommu->np = np;
>   	iommu->ops = ops;
>