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authorEric Dumazet <edumazet@google.com>2019-06-12 09:52:28 -0700
committerDavid S. Miller <davem@davemloft.net>2019-06-14 18:52:14 -0700
commitdcf70cefaf99a40cfa25face160f29c1cf3bf84d (patch)
treef7f5ab6e9407c14c1542cc9855a8eb63f3f6775a /net/packet
parentd4b5bd98faec345933d6080989e035a833b1077a (diff)
downloadlinux-dcf70cefaf99a40cfa25face160f29c1cf3bf84d.tar.bz2
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')
-rw-r--r--net/packet/af_packet.c14
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)