qlcnic: fix rcv buffer leak

Rcv producer value should be read in spin-lock.

Signed-off-by: Amit Kumar Salecha <amit.salecha@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/qlcnic/qlcnic_init.c b/drivers/net/qlcnic/qlcnic_init.c
index 9ef9f58..1b621ca 100644 (file)
--- a/drivers/net/qlcnic/qlcnic_init.c
+++ b/drivers/net/qlcnic/qlcnic_init.c
@@ -1554,9 +1554,10 @@ qlcnic_post_rx_buffers(struct qlcnic_adapter *adapter, u32 ringid,
        int producer, count = 0;
        struct list_head *head;
 
+       spin_lock(&rds_ring->lock);
+
        producer = rds_ring->producer;
 
-       spin_lock(&rds_ring->lock);
        head = &rds_ring->free_list;
        while (!list_empty(head)) {
 
@@ -1578,13 +1579,13 @@ qlcnic_post_rx_buffers(struct qlcnic_adapter *adapter, u32 ringid,
 
                producer = get_next_index(producer, rds_ring->num_desc);
        }
-       spin_unlock(&rds_ring->lock);
 
        if (count) {
                rds_ring->producer = producer;
                writel((producer-1) & (rds_ring->num_desc-1),
                                rds_ring->crb_rcv_producer);
        }
+       spin_unlock(&rds_ring->lock);
 }
 
 static void
@@ -1596,10 +1597,11 @@ qlcnic_post_rx_buffers_nodb(struct qlcnic_adapter *adapter,
        int producer, count = 0;
        struct list_head *head;
 
-       producer = rds_ring->producer;
        if (!spin_trylock(&rds_ring->lock))
                return;
 
+       producer = rds_ring->producer;
+
        head = &rds_ring->free_list;
        while (!list_empty(head)) {