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 <fenkes@de.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files 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()