linux-kernel - [PATCH v3 6/6] iommu: Propagate ret for a potential soft failure EINVAL

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Date:   Thu, 15 Sep 2022 00:58:45 -0700
From:   Nicolin Chen <nicolinc@...dia.com>
To:     <yong.wu@...iatek.com>, <joro@...tes.org>, <will@...nel.org>,
        <robin.murphy@....com>, <matthias.bgg@...il.com>,
        <jean-philippe@...aro.org>
CC:     <jgg@...dia.com>, <kevin.tian@...el.com>, <iommu@...ts.linux.dev>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <virtualization@...ts.linux-foundation.org>
Subject: [PATCH v3 6/6] iommu: Propagate ret for a potential soft failure EINVAL

Following the new rules in include/linux/iommu.h kdocs, EINVAL now can be
used to indicate that domain and device are incompatible by a caller that
treats it as a soft failure and tries attaching to another domain.

Either mtk_iommu or virtio driver has a place that returns a hard failure
instead of the return value from the function call, where an incompatible
errno EINVAL could potentially occur.

Propagate the real return value to not miss a potential soft failure.

Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 drivers/iommu/mtk_iommu.c    | 2 +-
 drivers/iommu/virtio-iommu.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index be1a7d1cc630..c30dc8f81778 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -666,7 +666,7 @@ static int mtk_iommu_attach_device(struct iommu_domain *domain,
 		ret = mtk_iommu_domain_finalise(dom, frstdata, region_id);
 		if (ret) {
 			mutex_unlock(&dom->mutex);
-			return -ENODEV;
+			return ret;
 		}
 		dom->bank = &data->bank[bankid];
 	}
diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c
index caca0a638c4d..f1ecc5589626 100644
--- a/drivers/iommu/virtio-iommu.c
+++ b/drivers/iommu/virtio-iommu.c
@@ -696,7 +696,7 @@ static int viommu_domain_finalise(struct viommu_endpoint *vdev,
 		if (ret) {
 			ida_free(&viommu->domain_ids, vdomain->id);
 			vdomain->viommu = NULL;
-			return -EOPNOTSUPP;
+			return ret;
 		}
 	}
 
-- 
2.17.1