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netvsc: simplify get next send section

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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>
This commit is contained in:
stephen hemminger 2017-01-24 13:06:14 -08:00 committed by David S. Miller
parent 6c80f3fc23
commit b58a185801
1 changed files with 7 additions and 19 deletions
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26
drivers/net/hyperv/netvsc.c
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@ -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) static u32 netvsc_get_next_send_section(struct netvsc_device *net_device)
{ {
unsigned long index; unsigned long *map_addr = net_device->send_section_map;
u32 max_words = net_device->map_words; unsigned int i;
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++) { for_each_clear_bit(i, map_addr, net_device->map_words) {
if (!~(map_addr[i])) if (sync_test_and_set_bit(i, map_addr) == 0)
continue; return i;
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;
} }
return ret_val;
return NETVSC_INVALID_INDEX;
} }
static u32 netvsc_copy_to_send_buf(struct netvsc_device *net_device, static u32 netvsc_copy_to_send_buf(struct netvsc_device *net_device,