iommu/omap: Add check for iommu group when no IOMMU in use

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>
Link: https://lore.kernel.org/r/20200518111057.23140-1-t-kristo@ti.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index 6699fe6d9e06efca0a8291af5a1db7ed3c21a325..5a9ba815863b460a0a7c6197c6f942c8c89d5df4 100644 (file)
--- a/drivers/iommu/omap-iommu.c
+++ b/drivers/iommu/omap-iommu.c
@@ -1726,6 +1726,9 @@ 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);