[patch 159/198] IB: Fix FMR pool crash

[akpm]

From: Roland Dreier <roland@xxxxxxxxxxx>

Mask bits correctly from jhash result in ib_fmr_hash() so that the
computed bucket index is within our hash table.  This fixes an SDP
crash.

Signed-off-by: Roland Dreier <roland@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---

 25-akpm/drivers/infiniband/core/fmr_pool.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff -puN drivers/infiniband/core/fmr_pool.c~ib-fix-fmr-pool-crash drivers/infiniband/core/fmr_pool.c
--- 25/drivers/infiniband/core/fmr_pool.c~ib-fix-fmr-pool-crash	2005-04-12 03:21:41.546820824 -0700
+++ 25-akpm/drivers/infiniband/core/fmr_pool.c	2005-04-12 03:21:41.549820368 -0700
@@ -103,9 +103,8 @@ struct ib_fmr_pool {
 
 static inline u32 ib_fmr_hash(u64 first_page)
 {
-	return jhash_2words((u32) first_page,
-			    (u32) (first_page >> 32),
-			    0);
+	return jhash_2words((u32) first_page, (u32) (first_page >> 32), 0) &
+		(IB_FMR_HASH_SIZE - 1);
 }
 
 /* Caller must hold pool_lock */
_
-
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