rds: Make rds_sock_lock BH rather than IRQ safe.

rds_sock_info() triggers locking warnings because we try to perform a
local_bh_enable() (via sock_i_ino()) while hardware interrupts are
disabled (via taking rds_sock_lock).

There is no reason for rds_sock_lock to be a hardware IRQ disabling
lock, none of these access paths run in hardware interrupt context.

Therefore making it a BH disabling lock is safe and sufficient to
fix this bug.

Reported-by: Kumar Sanghvi <kumaras@chelsio.com>
Reported-by: Josh Boyer <jwboyer@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/rds/af_rds.c b/net/rds/af_rds.c
index bb6ad81..424ff62 100644 (file)
--- a/net/rds/af_rds.c
+++ b/net/rds/af_rds.c
@@ -68,7 +68,6 @@ static int rds_release(struct socket *sock)
 {
        struct sock *sk = sock->sk;
        struct rds_sock *rs;
-       unsigned long flags;
 
        if (!sk)
                goto out;
@@ -94,10 +93,10 @@ static int rds_release(struct socket *sock)
        rds_rdma_drop_keys(rs);
        rds_notify_queue_get(rs, NULL);
 
-       spin_lock_irqsave(&rds_sock_lock, flags);
+       spin_lock_bh(&rds_sock_lock);
        list_del_init(&rs->rs_item);
        rds_sock_count--;
-       spin_unlock_irqrestore(&rds_sock_lock, flags);
+       spin_unlock_bh(&rds_sock_lock);
 
        rds_trans_put(rs->rs_transport);
 
@@ -409,7 +408,6 @@ static const struct proto_ops rds_proto_ops = {
 
 static int __rds_create(struct socket *sock, struct sock *sk, int protocol)
 {
-       unsigned long flags;
        struct rds_sock *rs;
 
        sock_init_data(sock, sk);
@@ -426,10 +424,10 @@ static int __rds_create(struct socket *sock, struct sock *sk, int protocol)
        spin_lock_init(&rs->rs_rdma_lock);
        rs->rs_rdma_keys = RB_ROOT;
 
-       spin_lock_irqsave(&rds_sock_lock, flags);
+       spin_lock_bh(&rds_sock_lock);
        list_add_tail(&rs->rs_item, &rds_sock_list);
        rds_sock_count++;
-       spin_unlock_irqrestore(&rds_sock_lock, flags);
+       spin_unlock_bh(&rds_sock_lock);
 
        return 0;
 }
@@ -471,12 +469,11 @@ static void rds_sock_inc_info(struct socket *sock, unsigned int len,
 {
        struct rds_sock *rs;
        struct rds_incoming *inc;
-       unsigned long flags;
        unsigned int total = 0;
 
        len /= sizeof(struct rds_info_message);
 
-       spin_lock_irqsave(&rds_sock_lock, flags);
+       spin_lock_bh(&rds_sock_lock);
 
        list_for_each_entry(rs, &rds_sock_list, rs_item) {
                read_lock(&rs->rs_recv_lock);
@@ -492,7 +489,7 @@ static void rds_sock_inc_info(struct socket *sock, unsigned int len,
                read_unlock(&rs->rs_recv_lock);
        }
 
-       spin_unlock_irqrestore(&rds_sock_lock, flags);
+       spin_unlock_bh(&rds_sock_lock);
 
        lens->nr = total;
        lens->each = sizeof(struct rds_info_message);
@@ -504,11 +501,10 @@ static void rds_sock_info(struct socket *sock, unsigned int len,
 {
        struct rds_info_socket sinfo;
        struct rds_sock *rs;
-       unsigned long flags;
 
        len /= sizeof(struct rds_info_socket);
 
-       spin_lock_irqsave(&rds_sock_lock, flags);
+       spin_lock_bh(&rds_sock_lock);
 
        if (len < rds_sock_count)
                goto out;
@@ -529,7 +525,7 @@ out:
        lens->nr = rds_sock_count;
        lens->each = sizeof(struct rds_info_socket);
 
-       spin_unlock_irqrestore(&rds_sock_lock, flags);
+       spin_unlock_bh(&rds_sock_lock);
 }
 
 static void rds_exit(void)