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authorEli Cohen <eli@mellanox.co.il>2008-06-23 12:29:58 -0400
committerRoland Dreier <rolandd@cisco.com>2008-06-23 12:29:58 -0400
commit87afd448b186c885d67a08b7417cd46253b6a9d6 (patch)
tree763ae0a3f10879482ad414c192ac2be4d60a2b90
parentf9d1c6ca2bb1bbfde4a95d9e55ab3b0126825295 (diff)
IB/mthca: Clear ICM pages before handing to FW
Current memfree FW has a bug which in some cases, assumes that ICM pages passed to it are cleared. This patch uses __GFP_ZERO to allocate all ICM pages passed to the FW. Once firmware with a fix is released, we can make the workaround conditional on firmware version. This fixes the bug reported by Arthur Kepner <akepner@sgi.com> here: http://lists.openfabrics.org/pipermail/general/2008-May/050026.html Cc: <stable@kernel.org> Signed-off-by: Eli Cohen <eli@mellanox.co.il> [ Rewritten to be a one-liner using __GFP_ZERO instead of vmap()ing ICM memory and memset()ing it to 0. - Roland ] Signed-off-by: Roland Dreier <rolandd@cisco.com>
-rw-r--r--drivers/infiniband/hw/mthca/mthca_memfree.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/mthca/mthca_memfree.c b/drivers/infiniband/hw/mthca/mthca_memfree.c
index b224079d4e1f..d5862e5d99a0 100644
--- a/drivers/infiniband/hw/mthca/mthca_memfree.c
+++ b/drivers/infiniband/hw/mthca/mthca_memfree.c
@@ -109,7 +109,11 @@ static int mthca_alloc_icm_pages(struct scatterlist *mem, int order, gfp_t gfp_m
109{ 109{
110 struct page *page; 110 struct page *page;
111 111
112 page = alloc_pages(gfp_mask, order); 112 /*
113 * Use __GFP_ZERO because buggy firmware assumes ICM pages are
114 * cleared, and subtle failures are seen if they aren't.
115 */
116 page = alloc_pages(gfp_mask | __GFP_ZERO, order);
113 if (!page) 117 if (!page)
114 return -ENOMEM; 118 return -ENOMEM;
115 119