IB/mlx5: Fix list_del of empty list

For archs with pages size of 4K, when the chunk is freed, fwp is not in the
list so avoid attempting to delete it.

Signed-off-by: Eli Cohen <eli@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c b/drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c
index ba816c2..37b6ad1 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c
@@ -229,7 +229,8 @@ static void free_4k(struct mlx5_core_dev *dev, u64 addr)
        set_bit(n, &fwp->bitmask);
        if (fwp->free_count == MLX5_NUM_4K_IN_PAGE) {
                rb_erase(&fwp->rb_node, &dev->priv.page_root);
-               list_del(&fwp->list);
+               if (fwp->free_count != 1)
+                       list_del(&fwp->list);
                dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
                __free_page(fwp->page);
                kfree(fwp);