diff options
author | Eric Dumazet <edumazet@google.com> | 2015-10-02 20:43:23 +0200 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2015-10-03 13:32:36 +0200 |
commit | fff1f3001cc58b5064a0f1154a7ac09b76f29c44 (patch) | |
tree | 910fe6f27dc9b9b7c6a0a56a9442ee264c9a6667 /include | |
parent | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net (diff) | |
download | linux-fff1f3001cc58b5064a0f1154a7ac09b76f29c44.tar.xz linux-fff1f3001cc58b5064a0f1154a7ac09b76f29c44.zip |
tcp: add a spinlock to protect struct request_sock_queue
struct request_sock_queue fields are currently protected
by the listener 'lock' (not a real spinlock)
We need to add a private spinlock instead, so that softirq handlers
creating children do not have to worry with backlog notion
that the listener 'lock' carries.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r-- | include/net/request_sock.h | 37 |
1 files changed, 18 insertions, 19 deletions
diff --git a/include/net/request_sock.h b/include/net/request_sock.h index d2544de329bd..202e36163ae3 100644 --- a/include/net/request_sock.h +++ b/include/net/request_sock.h @@ -176,9 +176,11 @@ struct fastopen_queue { * */ struct request_sock_queue { + spinlock_t rskq_lock; + u8 rskq_defer_accept; + struct request_sock *rskq_accept_head; struct request_sock *rskq_accept_tail; - u8 rskq_defer_accept; struct listen_sock *listen_opt; struct fastopen_queue fastopenq; /* Check max_qlen != 0 to determine * if TFO is enabled. @@ -196,16 +198,7 @@ void reqsk_queue_destroy(struct request_sock_queue *queue); void reqsk_fastopen_remove(struct sock *sk, struct request_sock *req, bool reset); -static inline struct request_sock * - reqsk_queue_yank_acceptq(struct request_sock_queue *queue) -{ - struct request_sock *req = queue->rskq_accept_head; - - queue->rskq_accept_head = NULL; - return req; -} - -static inline int reqsk_queue_empty(struct request_sock_queue *queue) +static inline bool reqsk_queue_empty(const struct request_sock_queue *queue) { return queue->rskq_accept_head == NULL; } @@ -215,6 +208,7 @@ static inline void reqsk_queue_add(struct request_sock_queue *queue, struct sock *parent, struct sock *child) { + spin_lock(&queue->rskq_lock); req->sk = child; sk_acceptq_added(parent); @@ -225,18 +219,23 @@ static inline void reqsk_queue_add(struct request_sock_queue *queue, queue->rskq_accept_tail = req; req->dl_next = NULL; + spin_unlock(&queue->rskq_lock); } -static inline struct request_sock *reqsk_queue_remove(struct request_sock_queue *queue) +static inline struct request_sock *reqsk_queue_remove(struct request_sock_queue *queue, + struct sock *parent) { - struct request_sock *req = queue->rskq_accept_head; - - WARN_ON(req == NULL); - - queue->rskq_accept_head = req->dl_next; - if (queue->rskq_accept_head == NULL) - queue->rskq_accept_tail = NULL; + struct request_sock *req; + spin_lock_bh(&queue->rskq_lock); + req = queue->rskq_accept_head; + if (req) { + sk_acceptq_removed(parent); + queue->rskq_accept_head = req->dl_next; + if (queue->rskq_accept_head == NULL) + queue->rskq_accept_tail = NULL; + } + spin_unlock_bh(&queue->rskq_lock); return req; } |