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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@mellanox.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@member.fsf.org>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.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;
}
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