Commit d4b5bd98 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller

net/packet: constify packet_lookup_frame() and __tpacket_has_room()

Goal is to be able to use __tpacket_has_room() without holding a lock.
Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 96f657e6
......@@ -460,8 +460,8 @@ static __u32 __packet_set_timestamp(struct packet_sock *po, void *frame,
return ts_status;
}
static void *packet_lookup_frame(struct packet_sock *po,
struct packet_ring_buffer *rb,
static void *packet_lookup_frame(const struct packet_sock *po,
const struct packet_ring_buffer *rb,
unsigned int position,
int status)
{
......@@ -1198,12 +1198,12 @@ static void packet_free_pending(struct packet_sock *po)
#define ROOM_LOW 0x1
#define ROOM_NORMAL 0x2
static bool __tpacket_has_room(struct packet_sock *po, int pow_off)
static bool __tpacket_has_room(const struct packet_sock *po, int pow_off)
{
int idx, len;
len = po->rx_ring.frame_max + 1;
idx = po->rx_ring.head;
len = READ_ONCE(po->rx_ring.frame_max) + 1;
idx = READ_ONCE(po->rx_ring.head);
if (pow_off)
idx += len >> pow_off;
if (idx >= len)
......
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