linux-kernel - Re: [PATCH 13/15] iommu/qcom: Use accessor functions for iommu private data

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20200316155223.GM304669@myrica>
Date:   Mon, 16 Mar 2020 16:52:23 +0100
From:   Jean-Philippe Brucker <jean-philippe@...aro.org>
To:     Joerg Roedel <joro@...tes.org>
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        virtualization@...ts.linux-foundation.org,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Hanjun Guo <guohanjun@...wei.com>,
        Sudeep Holla <sudeep.holla@....com>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH 13/15] iommu/qcom: Use accessor functions for iommu
 private data

On Tue, Mar 10, 2020 at 10:12:27AM +0100, Joerg Roedel wrote:
> From: Joerg Roedel <jroedel@...e.de>
> 
> Make use of dev_iommu_priv_set/get() functions.
> 
> Signed-off-by: Joerg Roedel <jroedel@...e.de>
> ---
>  drivers/iommu/qcom_iommu.c | 61 ++++++++++++++++++++++----------------
>  1 file changed, 36 insertions(+), 25 deletions(-)
> 
> diff --git a/drivers/iommu/qcom_iommu.c b/drivers/iommu/qcom_iommu.c
> index 4328da0b0a9f..80147f82d427 100644
> --- a/drivers/iommu/qcom_iommu.c
> +++ b/drivers/iommu/qcom_iommu.c
> @@ -74,16 +74,19 @@ static struct qcom_iommu_domain *to_qcom_iommu_domain(struct iommu_domain *dom)
>  
>  static const struct iommu_ops qcom_iommu_ops;
>  
> -static struct qcom_iommu_dev * to_iommu(struct iommu_fwspec *fwspec)
> +static struct qcom_iommu_dev * to_iommu(struct device *dev)
>  {
> +	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
> +
>  	if (!fwspec || fwspec->ops != &qcom_iommu_ops)
>  		return NULL;

Following other drivers, I think this test could move to add_device() (and
remove_device()?), but this is probably good enough for now.

> -	return fwspec->iommu_priv;
> +
> +	return dev_iommu_priv_get(dev);
>  }
[...]
>  static int qcom_iommu_of_xlate(struct device *dev, struct of_phandle_args *args)
>  {
> -	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
>  	struct qcom_iommu_dev *qcom_iommu;
>  	struct platform_device *iommu_pdev;
>  	unsigned asid = args->args[0];
> @@ -583,14 +594,14 @@ static int qcom_iommu_of_xlate(struct device *dev, struct of_phandle_args *args)
>  	    WARN_ON(asid > qcom_iommu->num_ctxs))
>  		return -EINVAL;
>  
> -	if (!fwspec->iommu_priv) {
> -		fwspec->iommu_priv = qcom_iommu;
> +	if (dev_iommu_priv_get(dev)) {

Should be:

	if (!dev_iommu_priv_set(dev))

Thanks,
Jean

> +		dev_iommu_priv_set(dev, qcom_iommu);
>  	} else {
>  		/* make sure devices iommus dt node isn't referring to
>  		 * multiple different iommu devices.  Multiple context
>  		 * banks are ok, but multiple devices are not:
>  		 */
> -		if (WARN_ON(qcom_iommu != fwspec->iommu_priv))
> +		if (WARN_ON(qcom_iommu != dev_iommu_priv_get(dev)))
>  			return -EINVAL;
>  	}
>  
> -- 
> 2.17.1
>