netvsc: simplify get next send section

Use kernel for_each_clear_bit macro to simplify finding next
available send section.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index c70c4ac..5cfdb1a 100644 (file)
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -680,27 +680,15 @@ static void netvsc_send_completion(struct netvsc_device *net_device,
 
 static u32 netvsc_get_next_send_section(struct netvsc_device *net_device)
 {
-       unsigned long index;
-       u32 max_words = net_device->map_words;
-       unsigned long *map_addr = (unsigned long *)net_device->send_section_map;
-       u32 section_cnt = net_device->send_section_cnt;
-       int ret_val = NETVSC_INVALID_INDEX;
-       int i;
-       int prev_val;
-
-       for (i = 0; i < max_words; i++) {
-               if (!~(map_addr[i]))
-                       continue;
-               index = ffz(map_addr[i]);
-               prev_val = sync_test_and_set_bit(index, &map_addr[i]);
-               if (prev_val)
-                       continue;
-               if ((index + (i * BITS_PER_LONG)) >= section_cnt)
-                       break;
-               ret_val = (index + (i * BITS_PER_LONG));
-               break;
+       unsigned long *map_addr = net_device->send_section_map;
+       unsigned int i;
+
+       for_each_clear_bit(i, map_addr, net_device->map_words) {
+               if (sync_test_and_set_bit(i, map_addr) == 0)
+                       return i;
        }
-       return ret_val;
+
+       return NETVSC_INVALID_INDEX;
 }
 
 static u32 netvsc_copy_to_send_buf(struct netvsc_device *net_device,