[PATCH -next] iommu/omap: Add check for iommu group when no IOMMU in use

From: Tero Kristo via iommu <iommu@lists.linux-foundation.org>
To: <iommu@lists.linux-foundation.org>, <joro@8bytes.org>,
	<tomi.valkeinen@ti.com>
Subject: [PATCH -next] iommu/omap: Add check for iommu group when no IOMMU in use
Date: Mon, 18 May 2020 14:10:57 +0300	[thread overview]
Message-ID: <20200518111057.23140-1-t-kristo@ti.com> (raw)

Most of the devices in OMAP family of SoCs are not using IOMMU. The
patch for converting the OMAP IOMMU to use generic IOMMU bus probe
functionality failed to add a check for this, so add it here.

Fixes: c822b37cac48 ("iommu/omap: Remove orphan_dev tracking")
Reported-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Tero Kristo <t-kristo@ti.com>
---
Hi Joerg,

This patch applies on top of linux-next, fixing an issue present there
at the moment.

-Tero


 drivers/iommu/omap-iommu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index 6480d5a62e33..c8282cc212cb 100644
--- a/drivers/iommu/omap-iommu.c
+++ b/drivers/iommu/omap-iommu.c
@@ -1727,6 +1727,9 @@ static struct iommu_group *omap_iommu_device_group(struct device *dev)
 	struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
 	struct iommu_group *group = ERR_PTR(-EINVAL);
 
+	if (!arch_data)
+		return ERR_PTR(-ENODEV);
+
 	if (arch_data->iommu_dev)
 		group = iommu_group_ref_get(arch_data->iommu_dev->group);
 
-- 
2.17.1

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