linux-kernel - [PATCH 3.2 058/199] net/mlx4: Remove BUG

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Message-ID: <lsq.1489146370.908297118@decadent.org.uk>
Date:   Fri, 10 Mar 2017 11:46:10 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Leon Romanovsky" <leonro@...lanox.com>,
        "Tariq Toukan" <tariqt@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Ozgur Karatas" <okaratas@...ber.fsf.org>
Subject: [PATCH 3.2 058/199] net/mlx4: Remove BUG_ON from ICM allocation
 routine

3.2.87-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Leon Romanovsky <leonro@...lanox.com>

commit c1d5f8ff80ea84768f5fae1ca9d1abfbb5e6bbaa upstream.

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: Ben Hutchings <ben@...adent.org.uk>
---
 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
@@ -113,8 +113,13 @@ 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;
 }