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authorJoerg Roedel <jroedel@suse.de>2015-06-29 10:16:08 +0200
committerJoerg Roedel <jroedel@suse.de>2015-06-29 21:57:19 +0200
commit38667f18900afe172a4fe44279b132b4140f920f (patch)
treed5e64dc3e7be3c9752675717fba5bc7c2a35dda8 /drivers/iommu
parent5ffde2f67181195d457b95df44b8f88e8d969d89 (diff)
downloadlinux-38667f18900afe172a4fe44279b132b4140f920f.tar.bz2
iommu: Ignore -ENODEV errors from add_device call-back
The -ENODEV error just means that the device is not translated by an IOMMU. We shouldn't bail out of iommu driver initialization when that happens, as this is a common scenario on ARM. Not returning -ENODEV in the drivers would be a bad idea, as the IOMMU core would have no indication whether a device is translated or not. This indication is not used at the moment, but will probably be in the future. Fixes: 19762d7 ("iommu: Propagate error in add_iommu_group") Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> Tested-by: Eric Auger <eric.auger@linaro.org> Tested-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/iommu.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 49e7542510d1..f286090931cc 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -847,13 +847,24 @@ static int add_iommu_group(struct device *dev, void *data)
{
struct iommu_callback_data *cb = data;
const struct iommu_ops *ops = cb->ops;
+ int ret;
if (!ops->add_device)
return 0;
WARN_ON(dev->iommu_group);
- return ops->add_device(dev);
+ ret = ops->add_device(dev);
+
+ /*
+ * We ignore -ENODEV errors for now, as they just mean that the
+ * device is not translated by an IOMMU. We still care about
+ * other errors and fail to initialize when they happen.
+ */
+ if (ret == -ENODEV)
+ ret = 0;
+
+ return ret;
}
static int remove_iommu_group(struct device *dev, void *data)