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| author | Eric Dumazet <edumazet@google.com> | 2019-06-12 09:52:28 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-06-14 18:52:14 -0700 |
| commit | dcf70cefaf99a40cfa25face160f29c1cf3bf84d (patch) | |
| tree | f7f5ab6e9407c14c1542cc9855a8eb63f3f6775a /net/packet/af_packet.c | |
| parent | d4b5bd98faec345933d6080989e035a833b1077a (diff) | |
| download | lwn-dcf70cefaf99a40cfa25face160f29c1cf3bf84d.tar.gz lwn-dcf70cefaf99a40cfa25face160f29c1cf3bf84d.zip | |
net/packet: constify prb_lookup_block() and __tpacket_v3_has_room()
Goal is to be able to use __tpacket_v3_has_room() without holding
a lock.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/packet/af_packet.c')
| -rw-r--r-- | net/packet/af_packet.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index 273bffd2130d..5ef63d0c3ad0 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -1082,10 +1082,10 @@ static void *packet_current_rx_frame(struct packet_sock *po, } } -static void *prb_lookup_block(struct packet_sock *po, - struct packet_ring_buffer *rb, - unsigned int idx, - int status) +static void *prb_lookup_block(const struct packet_sock *po, + const struct packet_ring_buffer *rb, + unsigned int idx, + int status) { struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb); struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, idx); @@ -1211,12 +1211,12 @@ static bool __tpacket_has_room(const struct packet_sock *po, int pow_off) return packet_lookup_frame(po, &po->rx_ring, idx, TP_STATUS_KERNEL); } -static bool __tpacket_v3_has_room(struct packet_sock *po, int pow_off) +static bool __tpacket_v3_has_room(const struct packet_sock *po, int pow_off) { int idx, len; - len = po->rx_ring.prb_bdqc.knum_blocks; - idx = po->rx_ring.prb_bdqc.kactive_blk_num; + len = READ_ONCE(po->rx_ring.prb_bdqc.knum_blocks); + idx = READ_ONCE(po->rx_ring.prb_bdqc.kactive_blk_num); if (pow_off) idx += len >> pow_off; if (idx >= len) |