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From:   Joerg Roedel <joro@8bytes.org>
To:     Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
        Robin Murphy <robin.murphy@arm.com>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Kukjin Kim <kgene@kernel.org>,
        Krzysztof Kozlowski <krzk@kernel.org>,
        David Woodhouse <dwmw2@infradead.org>,
        Lu Baolu <baolu.lu@linux.intel.com>,
        Andy Gross <agross@kernel.org>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Rob Clark <robdclark@gmail.com>,
        Heiko Stuebner <heiko@sntech.de>,
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        Thierry Reding <thierry.reding@gmail.com>,
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        Jean-Philippe Brucker <jean-philippe@linaro.org>
Cc:     Daniel Drake <drake@endlessm.com>, jonathan.derrick@intel.com,
        iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
        linux-samsung-soc@vger.kernel.org, linux-arm-msm@vger.kernel.org,
        linux-mediatek@lists.infradead.org,
        linux-rockchip@lists.infradead.org, linux-s390@vger.kernel.org,
        linux-tegra@vger.kernel.org,
        virtualization@lists.linux-foundation.org,
        Joerg Roedel <jroedel@suse.de>
Subject: [PATCH v3 06/34] iommu/amd: Return -ENODEV in add_device when device is not handled by IOMMU
Date:   Wed, 29 Apr 2020 15:36:44 +0200
Message-Id: <20200429133712.31431-7-joro@8bytes.org>
In-Reply-To: <20200429133712.31431-1-joro@8bytes.org>
References: <20200429133712.31431-1-joro@8bytes.org>
Sender: linux-kernel-owner@vger.kernel.org
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From: Joerg Roedel <jroedel@suse.de>

When check_device() fails on the device, it is not handled by the
IOMMU and amd_iommu_add_device() needs to return -ENODEV.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
 drivers/iommu/amd_iommu.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 504f2db75eda..3e0d27f7622e 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2157,9 +2157,12 @@ static int amd_iommu_add_device(struct device *dev)
 	struct amd_iommu *iommu;
 	int ret, devid;
 
-	if (!check_device(dev) || get_dev_data(dev))
+	if (get_dev_data(dev))
 		return 0;
 
+	if (!check_device(dev))
+		return -ENODEV;
+
 	devid = get_device_id(dev);
 	if (devid < 0)
 		return devid;
-- 
2.17.1