This is a note to let you know that I've just added the patch titled
iommu/arm-smmu-v3: Clean up more on probe failure
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iommu-arm-smmu-v3-clean-up-more-on-probe-failure.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit cdb479091b880db38d2afb83c710f60ca9da87a1
Author: Robin Murphy <robin.murphy@xxxxxxx>
Date: Thu Dec 5 16:33:57 2024 +0000
iommu/arm-smmu-v3: Clean up more on probe failure
[ Upstream commit fcbd621567420b3a2f21f49bbc056de8b273c625 ]
kmemleak noticed that the iopf queue allocated deep down within
arm_smmu_init_structures() can be leaked by a subsequent error return
from arm_smmu_device_probe(). Furthermore, after arm_smmu_device_reset()
we will also leave the SMMU enabled with an empty Stream Table, silently
blocking all DMA. This proves rather annoying for debugging said probe
failure, so let's handle it a bit better by putting the SMMU back into
(more or less) the same state as if it hadn't probed at all.
Signed-off-by: Robin Murphy <robin.murphy@xxxxxxx>
Link: https://lore.kernel.org/r/5137901958471cf67f2fad5c2229f8a8f1ae901a.1733406914.git.robin.murphy@xxxxxxx
Signed-off-by: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 45b43f729f895..96b72f3dad0d0 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -3880,7 +3880,7 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
/* Initialise in-memory data structures */
ret = arm_smmu_init_structures(smmu);
if (ret)
- return ret;
+ goto err_free_iopf;
/* Record our private device structure */
platform_set_drvdata(pdev, smmu);
@@ -3891,22 +3891,29 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
/* Reset the device */
ret = arm_smmu_device_reset(smmu, bypass);
if (ret)
- return ret;
+ goto err_disable;
/* And we're up. Go go go! */
ret = iommu_device_sysfs_add(&smmu->iommu, dev, NULL,
"smmu3.%pa", &ioaddr);
if (ret)
- return ret;
+ goto err_disable;
ret = iommu_device_register(&smmu->iommu, &arm_smmu_ops, dev);
if (ret) {
dev_err(dev, "Failed to register iommu\n");
- iommu_device_sysfs_remove(&smmu->iommu);
- return ret;
+ goto err_free_sysfs;
}
return 0;
+
+err_free_sysfs:
+ iommu_device_sysfs_remove(&smmu->iommu);
+err_disable:
+ arm_smmu_device_disable(smmu);
+err_free_iopf:
+ iopf_queue_free(smmu->evtq.iopf);
+ return ret;
}
static int arm_smmu_device_remove(struct platform_device *pdev)
