Patch "iommu/sprd: Release dma buffer to avoid memory leak" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    iommu/sprd: Release dma buffer to avoid memory leak

to the 5.15-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-sprd-release-dma-buffer-to-avoid-memory-leak.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 970eb96b6ae0e5b7cbf7bc98f43b76e92d791ae0
Author: Chunyan Zhang <chunyan.zhang@xxxxxxxxxx>
Date:   Fri Mar 31 11:31:23 2023 +0800

    iommu/sprd: Release dma buffer to avoid memory leak
    
    [ Upstream commit 9afea57384d4ae7b2034593eac7fa76c7122762a ]
    
    When attaching to a domain, the driver would alloc a DMA buffer which
    is used to store address mapping table, and it need to be released
    when the IOMMU domain is freed.
    
    Signed-off-by: Chunyan Zhang <chunyan.zhang@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/20230331033124.864691-2-zhang.lyra@xxxxxxxxx
    Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/iommu/sprd-iommu.c b/drivers/iommu/sprd-iommu.c
index 27ac818b03544..723940e841612 100644
--- a/drivers/iommu/sprd-iommu.c
+++ b/drivers/iommu/sprd-iommu.c
@@ -151,13 +151,6 @@ static struct iommu_domain *sprd_iommu_domain_alloc(unsigned int domain_type)
 	return &dom->domain;
 }
 
-static void sprd_iommu_domain_free(struct iommu_domain *domain)
-{
-	struct sprd_iommu_domain *dom = to_sprd_domain(domain);
-
-	kfree(dom);
-}
-
 static void sprd_iommu_first_vpn(struct sprd_iommu_domain *dom)
 {
 	struct sprd_iommu_device *sdev = dom->sdev;
@@ -230,6 +223,28 @@ static void sprd_iommu_hw_en(struct sprd_iommu_device *sdev, bool en)
 	sprd_iommu_update_bits(sdev, reg_cfg, mask, 0, val);
 }
 
+static void sprd_iommu_cleanup(struct sprd_iommu_domain *dom)
+{
+	size_t pgt_size;
+
+	/* Nothing need to do if the domain hasn't been attached */
+	if (!dom->sdev)
+		return;
+
+	pgt_size = sprd_iommu_pgt_size(&dom->domain);
+	dma_free_coherent(dom->sdev->dev, pgt_size, dom->pgt_va, dom->pgt_pa);
+	dom->sdev = NULL;
+	sprd_iommu_hw_en(dom->sdev, false);
+}
+
+static void sprd_iommu_domain_free(struct iommu_domain *domain)
+{
+	struct sprd_iommu_domain *dom = to_sprd_domain(domain);
+
+	sprd_iommu_cleanup(dom);
+	kfree(dom);
+}
+
 static int sprd_iommu_attach_device(struct iommu_domain *domain,
 				    struct device *dev)
 {



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