From 8c08d50d4fc52a9367c356ebbeb194c30fbc7ac8 Mon Sep 17 00:00:00 2001 From: Joachim Fenkes Date: Tue, 16 Oct 2007 17:26:54 +0200 Subject: [PATCH] IB/ehca: Fix ehca_encode_hwpage_size() and alloc_fmr() Simplify ehca_encode_hwpage_size(), fixing an infinite loop for pgsize == 0 in the process. Fix the bug in alloc_fmr() that triggered the loop. Signed-off-by: Joachim Fenkes Signed-off-by: Roland Dreier --- drivers/infiniband/hw/ehca/ehca_mrmw.c | 15 ++++----------- 1 file changed, 4 insertions(+), 11 deletions(-) diff --git a/drivers/infiniband/hw/ehca/ehca_mrmw.c b/drivers/infiniband/hw/ehca/ehca_mrmw.c index 16c9efd8eeac..b9a788c4fdd1 100644 --- a/drivers/infiniband/hw/ehca/ehca_mrmw.c +++ b/drivers/infiniband/hw/ehca/ehca_mrmw.c @@ -72,17 +72,9 @@ enum ehca_mr_pgsize { static u32 ehca_encode_hwpage_size(u32 pgsize) { - u32 idx = 0; - pgsize >>= 12; - /* - * map mr page size into hw code: - * 0, 1, 2, 3 for 4K, 64K, 1M, 64M - */ - while (!(pgsize & 1)) { - idx++; - pgsize >>= 4; - } - return idx; + int log = ilog2(pgsize); + WARN_ON(log < 12 || log > 24 || log & 3); + return (log - 12) / 4; } static u64 ehca_get_max_hwpage_size(struct ehca_shca *shca) @@ -826,6 +818,7 @@ struct ib_fmr *ehca_alloc_fmr(struct ib_pd *pd, /* register MR on HCA */ memset(&pginfo, 0, sizeof(pginfo)); + pginfo.hwpage_size = hw_pgsize; /* * pginfo.num_hwpages==0, ie register_rpages() will not be called * but deferred to map_phys_fmr()