[PATCH] Fix one error in mthca_alloc

drivers/infiniband/hw/mthca/mthca_allocator.c: alloc->last left unchanged in mthca_alloc, which
has impact on performance of function find_next_zero_bit in mthca_alloc.

Signed-off-by: kangning <redacted>
---
 drivers/infiniband/hw/mthca/mthca_allocator.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/infiniband/hw/mthca/mthca_allocator.c b/drivers/infiniband/hw/mthca/mthca_allocator.c
index aef1d274a14e..e81bb0fcd08e 100644
--- a/drivers/infiniband/hw/mthca/mthca_allocator.c
+++ b/drivers/infiniband/hw/mthca/mthca_allocator.c

@@ -51,6 +51,10 @@ u32 mthca_alloc(struct mthca_alloc *alloc)
 	}
 
 	if (obj < alloc->max) {
+		alloc->last = (obj + 1);
+		if (alloc->last == alloc->max) {
+			alloc->last = 0;
+		}
 		set_bit(obj, alloc->table);
 		obj |= alloc->top;
 	} else

-- 
2.17.1