farsync: fix support for over 30 cards

We're trying to fill a 64 bit bitmap but only the lower 30 shifts work
because the shift wraps around.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/net/wan/farsync.c b/drivers/net/wan/farsync.c
index 1a623183cbe5..b6271325f803 100644
--- a/drivers/net/wan/farsync.c
+++ b/drivers/net/wan/farsync.c
@@ -597,7 +597,7 @@ fst_q_work_item(u64 * queue, int card_index)
          * bottom half for the card.  Note the limitation of 64 cards.
          * That ought to be enough
          */
-        mask = 1 << card_index;
+        mask = (u64)1 << card_index;
         *queue |= mask;
         spin_unlock_irqrestore(&fst_work_q_lock, flags);
 }