linux-kernel - [PATCH 5.15 040/135] drm/msm: use for_each_sgtable

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Message-Id: <20220627111939.321456081@linuxfoundation.org>
Date:   Mon, 27 Jun 2022 13:20:47 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jonathan Marek <jonathan@...ek.ca>,
        Rob Clark <robdclark@...omium.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 040/135] drm/msm: use for_each_sgtable_sg to iterate over scatterlist

From: Jonathan Marek <jonathan@...ek.ca>

[ Upstream commit 62b5e322fb6cc5a5a91fdeba0e4e57e75d9f4387 ]

The dma_map_sgtable() call (used to invalidate cache) overwrites sgt->nents
with 1, so msm_iommu_pagetable_map maps only the first physical segment.

To fix this problem use for_each_sgtable_sg(), which uses orig_nents.

Fixes: b145c6e65eb0 ("drm/msm: Add support to create a local pagetable")
Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
Link: https://lore.kernel.org/r/20220613221019.11399-1-jonathan@marek.ca
Signed-off-by: Rob Clark <robdclark@...omium.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/msm/msm_iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/msm_iommu.c b/drivers/gpu/drm/msm/msm_iommu.c
index bcaddbba564d..a54ed354578b 100644
--- a/drivers/gpu/drm/msm/msm_iommu.c
+++ b/drivers/gpu/drm/msm/msm_iommu.c
@@ -58,7 +58,7 @@ static int msm_iommu_pagetable_map(struct msm_mmu *mmu, u64 iova,
 	u64 addr = iova;
 	unsigned int i;
 
-	for_each_sg(sgt->sgl, sg, sgt->nents, i) {
+	for_each_sgtable_sg(sgt, sg, i) {
 		size_t size = sg->length;
 		phys_addr_t phys = sg_phys(sg);
 
-- 
2.35.1