linux-kernel - [PATCH] Fix dma_unmap

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Message-ID: <20250630092346.81017-2-fourier.thomas@gmail.com>
Date: Mon, 30 Jun 2025 11:23:46 +0200
From: Thomas Fourier <fourier.thomas@...il.com>
To: 
Cc: Thomas Fourier <fourier.thomas@...il.com>,
	Cheng Xu <chengyou@...ux.alibaba.com>,
	Kai Shen <kaishen@...ux.alibaba.com>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Leon Romanovsky <leon@...nel.org>,
	linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] Fix dma_unmap_sg() nents value

The dma_unmap_sg() functions should be called with the same nents as the
dma_map_sg(), not the value the map function returned.

Fixes: ed10435d3583 ("RDMA/erdma: Implement hierarchical MTT")
Signed-off-by: Thomas Fourier <fourier.thomas@...il.com>
---
 drivers/infiniband/hw/erdma/erdma_verbs.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/erdma/erdma_verbs.c b/drivers/infiniband/hw/erdma/erdma_verbs.c
index af36a8d2df22..ec0ad4086066 100644
--- a/drivers/infiniband/hw/erdma/erdma_verbs.c
+++ b/drivers/infiniband/hw/erdma/erdma_verbs.c
@@ -629,7 +629,8 @@ static struct erdma_mtt *erdma_create_cont_mtt(struct erdma_dev *dev,
 static void erdma_destroy_mtt_buf_sg(struct erdma_dev *dev,
 				     struct erdma_mtt *mtt)
 {
-	dma_unmap_sg(&dev->pdev->dev, mtt->sglist, mtt->nsg, DMA_TO_DEVICE);
+	dma_unmap_sg(&dev->pdev->dev, mtt->sglist,
+		     DIV_ROUND_UP(mtt->size, PAGE_SIZE), DMA_TO_DEVICE);
 	vfree(mtt->sglist);
 }
 
-- 
2.43.0