Patch "net/mlx5e: Set page to null in case dma mapping fails" has been added to the 4.13-stable tree

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

net/mlx5e: Set page to null in case dma mapping fails

to the 4.13-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:
net-mlx5e-set-page-to-null-in-case-dma-mapping-fails.patch
and it can be found in the queue-4.13 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Inbar Karmy <[email protected]>
Date: Sun, 15 Oct 2017 17:30:59 +0300
Subject: net/mlx5e: Set page to null in case dma mapping fails

From: Inbar Karmy <[email protected]>

[ Upstream commit 2e50b2619538ea0224c037f6fa746023089e0654 ]

Currently, when dma mapping fails, put_page is called,
but the page is not set to null. Later, in the page_reuse treatment in mlx5e_free_rx_descs(), mlx5e_page_release() is called for the second time, improperly doing dma_unmap (for a non-mapped address) and an extra put_page. Prevent this by nullifying the page pointer when dma_map fails.

---
 drivers/net/ethernet/mellanox/mlx5/core/en_rx.c |   12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

@@ -213,22 +213,20 @@ static inline bool mlx5e_rx_cache_get(st
 static inline int mlx5e_page_alloc_mapped(struct mlx5e_rq *rq,
 					  struct mlx5e_dma_info *dma_info)
 {
-	struct page *page;
-
 	if (mlx5e_rx_cache_get(rq, dma_info))
 		return 0;
 
-	page = dev_alloc_pages(rq->buff.page_order);
-	if (unlikely(!page))
+	dma_info->page = dev_alloc_pages(rq->buff.page_order);
+	if (unlikely(!dma_info->page))
 		return -ENOMEM;
 
-	dma_info->addr = dma_map_page(rq->pdev, page, 0,
+	dma_info->addr = dma_map_page(rq->pdev, dma_info->page, 0,
 				      RQ_PAGE_SIZE(rq), rq->buff.map_dir);
 	if (unlikely(dma_mapping_error(rq->pdev, dma_info->addr))) {
-		put_page(page);
+		put_page(dma_info->page);
+		dma_info->page = NULL;
 		return -ENOMEM;
 	}
-	dma_info->page = page;
 
 	return 0;
 }

Patches currently in stable-queue which might be from [email protected] are

queue-4.13/net-mlx5e-set-page-to-null-in-case-dma-mapping-fails.patch