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authorAndreas Schultz <aschultz@tpip.net>2017-01-26 16:21:48 +0100
committerDavid S. Miller <davem@davemloft.net>2017-01-29 13:54:00 -0500
commit10931923b5a5624d254ec3c8db6970f63b277cac (patch)
tree0f965c10ef0fea1e736ea917dfa9e6ef98496c05 /drivers/net/gtp.c
parent4e8f2fc1a55d543717efb70e170b09e773d0542b (diff)
downloadlinux-10931923b5a5624d254ec3c8db6970f63b277cac.tar.bz2
gtp: remove unnecessary rcu_read_lock
The rcu read lock is hold by default in the ip input path. There is no need to hold it twice in the socket recv decapsulate code path. Signed-off-by: Andreas Schultz <aschultz@tpip.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/gtp.c')
-rw-r--r--drivers/net/gtp.c24
1 files changed, 4 insertions, 20 deletions
diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
index 99d3df788ce8..e11a1ead3228 100644
--- a/drivers/net/gtp.c
+++ b/drivers/net/gtp.c
@@ -183,7 +183,6 @@ static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb,
sizeof(struct gtp0_header);
struct gtp0_header *gtp0;
struct pdp_ctx *pctx;
- int ret = 0;
if (!pskb_may_pull(skb, hdrlen))
return -1;
@@ -196,26 +195,19 @@ static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb,
if (gtp0->type != GTP_TPDU)
return 1;
- rcu_read_lock();
pctx = gtp0_pdp_find(gtp, be64_to_cpu(gtp0->tid));
if (!pctx) {
netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb);
- ret = -1;
- goto out_rcu;
+ return -1;
}
if (!gtp_check_src_ms(skb, pctx, hdrlen)) {
netdev_dbg(gtp->dev, "No PDP ctx for this MS\n");
- ret = -1;
- goto out_rcu;
+ return -1;
}
- rcu_read_unlock();
/* Get rid of the GTP + UDP headers. */
return iptunnel_pull_header(skb, hdrlen, skb->protocol, xnet);
-out_rcu:
- rcu_read_unlock();
- return ret;
}
static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb,
@@ -225,7 +217,6 @@ static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb,
sizeof(struct gtp1_header);
struct gtp1_header *gtp1;
struct pdp_ctx *pctx;
- int ret = 0;
if (!pskb_may_pull(skb, hdrlen))
return -1;
@@ -253,26 +244,19 @@ static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb,
gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr));
- rcu_read_lock();
pctx = gtp1_pdp_find(gtp, ntohl(gtp1->tid));
if (!pctx) {
netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb);
- ret = -1;
- goto out_rcu;
+ return -1;
}
if (!gtp_check_src_ms(skb, pctx, hdrlen)) {
netdev_dbg(gtp->dev, "No PDP ctx for this MS\n");
- ret = -1;
- goto out_rcu;
+ return -1;
}
- rcu_read_unlock();
/* Get rid of the GTP + UDP headers. */
return iptunnel_pull_header(skb, hdrlen, skb->protocol, xnet);
-out_rcu:
- rcu_read_unlock();
- return ret;
}
static void gtp_encap_disable(struct gtp_dev *gtp)