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Date: Fri, 4 Aug 2017 16:16:29 -0700 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Ozgur Karatas <okaratas@...ber.fsf.org>, Leon Romanovsky <leonro@...lanox.com>, Tariq Toukan <tariqt@...lanox.com>, "David S. Miller" <davem@...emloft.net>, Sasha Levin <alexander.levin@...izon.com> Subject: [PATCH 3.18 43/50] net/mlx4: Remove BUG_ON from ICM allocation routine 3.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Leon Romanovsky <leonro@...lanox.com> [ Upstream commit c1d5f8ff80ea84768f5fae1ca9d1abfbb5e6bbaa ] This patch removes BUG_ON() macro from mlx4_alloc_icm_coherent() by checking DMA address alignment in advance and performing proper folding in case of error. Fixes: 5b0bf5e25efe ("mlx4_core: Support ICM tables in coherent memory") Reported-by: Ozgur Karatas <okaratas@...ber.fsf.org> Signed-off-by: Leon Romanovsky <leonro@...lanox.com> Signed-off-by: Tariq Toukan <tariqt@...lanox.com> Signed-off-by: David S. Miller <davem@...emloft.net> Signed-off-by: Sasha Levin <alexander.levin@...izon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/net/ethernet/mellanox/mlx4/icm.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) --- a/drivers/net/ethernet/mellanox/mlx4/icm.c +++ b/drivers/net/ethernet/mellanox/mlx4/icm.c @@ -117,8 +117,13 @@ static int mlx4_alloc_icm_coherent(struc if (!buf) return -ENOMEM; + if (offset_in_page(buf)) { + dma_free_coherent(dev, PAGE_SIZE << order, + buf, sg_dma_address(mem)); + return -ENOMEM; + } + sg_set_buf(mem, buf, PAGE_SIZE << order); - BUG_ON(mem->offset); sg_dma_len(mem) = PAGE_SIZE << order; return 0; }
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