[PATCH v4 09/10] xen/arm: smmuv3: Fix fall-through warning for Clang

[Rahul Singh <rahul.singh@xxxxxxx>]

From: "Gustavo A. R. Silva" <gustavoars@xxxxxxxxxx>

Backport Linux commit 5a1ab5c0299a. This is the clean backport without
any changes.

Fix the following fallthrough warning (arm64-randconfig with Clang):

drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c:382:2: warning: unannotated 
fall-through between switch labels [-Wimplicit-fallthrough]

Reported-by: kernel test robot <lkp@xxxxxxxxx>
Link: https://lore.kernel.org/lkml/60edca25.k00ut905IFBjPyt5%25lkp@xxxxxxxxx/
Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
Origin: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
5a1ab5c0299a
Signed-off-by: Rahul Singh <rahul.singh@xxxxxxx>
Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
Changes in v4:
- Move Stefano Acked-by after Signed-off
Changes in v3:
 - Added Stefano Acked-by.
Changes in v2:
 - fix commit msg.
---
 xen/drivers/passthrough/arm/smmu-v3.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/xen/drivers/passthrough/arm/smmu-v3.c 
b/xen/drivers/passthrough/arm/smmu-v3.c
index c47e7dea04..b8ca4b0a24 100644
--- a/xen/drivers/passthrough/arm/smmu-v3.c
+++ b/xen/drivers/passthrough/arm/smmu-v3.c
@@ -492,6 +492,7 @@ static void arm_smmu_cmdq_skip_err(struct arm_smmu_device 
*smmu)
        switch (idx) {
        case CMDQ_ERR_CERROR_ABT_IDX:
                dev_err(smmu->dev, "retrying command fetch\n");
+               return;
        case CMDQ_ERR_CERROR_NONE_IDX:
                return;
        case CMDQ_ERR_CERROR_ATC_INV_IDX:
-- 
2.25.1