ipx: remove the BKL

This replaces all instances of lock_kernel in the
IPX code with lock_sock. As far as I can tell, this
is safe to do, because there is no global state
that needs to be locked in IPX, and the code does
not recursively take the lock or sleep indefinitely
while holding it.

Compile-tested only.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: netdev@vger.kernel.org

net/ipx/Kconfig

@@ -3,7 +3,6 @@
 #
 config IPX
 	tristate "The IPX protocol"
-	depends on BKL # should be fixable
 	select LLC
 	---help---
 	  This is support for the Novell networking protocol, IPX, commonly

net/ipx/af_ipx.c

@@ -42,7 +42,6 @@
 #include <linux/uio.h>
 #include <linux/slab.h>
 #include <linux/skbuff.h>
-#include <linux/smp_lock.h>
 #include <linux/socket.h>
 #include <linux/sockios.h>
 #include <linux/string.h>
@@ -1299,7 +1298,7 @@ static int ipx_setsockopt(struct socket *sock, int level, int optname,
 	int opt;
 	int rc = -EINVAL;
 
-	lock_kernel();
+	lock_sock(sk);
 	if (optlen != sizeof(int))
 		goto out;
 
@@ -1314,7 +1313,7 @@ static int ipx_setsockopt(struct socket *sock, int level, int optname,
 	ipx_sk(sk)->type = opt;
 	rc = 0;
 out:
-	unlock_kernel();
+	release_sock(sk);
 	return rc;
 }
 
@@ -1326,7 +1325,7 @@ static int ipx_getsockopt(struct socket *sock, int level, int optname,
 	int len;
 	int rc = -ENOPROTOOPT;
 
-	lock_kernel();
+	lock_sock(sk);
 	if (!(level == SOL_IPX && optname == IPX_TYPE))
 		goto out;
 
@@ -1347,7 +1346,7 @@ static int ipx_getsockopt(struct socket *sock, int level, int optname,
 
 	rc = 0;
 out:
-	unlock_kernel();
+	release_sock(sk);
 	return rc;
 }
 
@@ -1396,7 +1395,7 @@ static int ipx_release(struct socket *sock)
 	if (!sk)
 		goto out;
 
-	lock_kernel();
+	lock_sock(sk);
 	if (!sock_flag(sk, SOCK_DEAD))
 		sk->sk_state_change(sk);
 
@@ -1404,7 +1403,7 @@ static int ipx_release(struct socket *sock)
 	sock->sk = NULL;
 	sk_refcnt_debug_release(sk);
 	ipx_destroy_socket(sk);
-	unlock_kernel();
+	release_sock(sk);
 out:
 	return 0;
 }
@@ -1530,11 +1529,12 @@ out:
 
 static int ipx_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 {
+	struct sock *sk = sock->sk;
 	int rc;
 
-	lock_kernel();
+	lock_sock(sk);
 	rc = __ipx_bind(sock, uaddr, addr_len);
-	unlock_kernel();
+	release_sock(sk);
 
 	return rc;
 }
@@ -1551,7 +1551,7 @@ static int ipx_connect(struct socket *sock, struct sockaddr *uaddr,
 	sk->sk_state	= TCP_CLOSE;
 	sock->state 	= SS_UNCONNECTED;
 
-	lock_kernel();
+	lock_sock(sk);
 	if (addr_len != sizeof(*addr))
 		goto out;
 	addr = (struct sockaddr_ipx *)uaddr;
@@ -1598,7 +1598,7 @@ static int ipx_connect(struct socket *sock, struct sockaddr *uaddr,
 		ipxrtr_put(rt);
 	rc = 0;
 out:
-	unlock_kernel();
+	release_sock(sk);
 	return rc;
 }
 
@@ -1614,7 +1614,7 @@ static int ipx_getname(struct socket *sock, struct sockaddr *uaddr,
 
 	*uaddr_len = sizeof(struct sockaddr_ipx);
 
-	lock_kernel();
+	lock_sock(sk);
 	if (peer) {
 		rc = -ENOTCONN;
 		if (sk->sk_state != TCP_ESTABLISHED)
@@ -1649,19 +1649,7 @@ static int ipx_getname(struct socket *sock, struct sockaddr *uaddr,
 
 	rc = 0;
 out:
-	unlock_kernel();
-	return rc;
-}
-
-static unsigned int ipx_datagram_poll(struct file *file, struct socket *sock,
-			   poll_table *wait)
-{
-	int rc;
-
-	lock_kernel();
-	rc = datagram_poll(file, sock, wait);
-	unlock_kernel();
-
+	release_sock(sk);
 	return rc;
 }
 
@@ -1736,7 +1724,7 @@ static int ipx_sendmsg(struct kiocb *iocb, struct socket *sock,
 	int rc = -EINVAL;
 	int flags = msg->msg_flags;
 
-	lock_kernel();
+	lock_sock(sk);
 	/* Socket gets bound below anyway */
 /*	if (sk->sk_zapped)
 		return -EIO; */	/* Socket not bound */
@@ -1788,7 +1776,7 @@ static int ipx_sendmsg(struct kiocb *iocb, struct socket *sock,
 	if (rc >= 0)
 		rc = len;
 out:
-	unlock_kernel();
+	release_sock(sk);
 	return rc;
 }
 
@@ -1803,7 +1791,7 @@ static int ipx_recvmsg(struct kiocb *iocb, struct socket *sock,
 	struct sk_buff *skb;
 	int copied, rc;
 
-	lock_kernel();
+	lock_sock(sk);
 	/* put the autobinding in */
 	if (!ipxs->port) {
 		struct sockaddr_ipx uaddr;
@@ -1862,7 +1850,7 @@ static int ipx_recvmsg(struct kiocb *iocb, struct socket *sock,
 out_free:
 	skb_free_datagram(sk, skb);
 out:
-	unlock_kernel();
+	release_sock(sk);
 	return rc;
 }
 
@@ -1874,7 +1862,7 @@ static int ipx_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 	struct sock *sk = sock->sk;
 	void __user *argp = (void __user *)arg;
 
-	lock_kernel();
+	lock_sock(sk);
 	switch (cmd) {
 	case TIOCOUTQ:
 		amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
@@ -1937,7 +1925,7 @@ static int ipx_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 		rc = -ENOIOCTLCMD;
 		break;
 	}
-	unlock_kernel();
+	release_sock(sk);
 
 	return rc;
 }
@@ -1984,7 +1972,7 @@ static const struct proto_ops ipx_dgram_ops = {
 	.socketpair	= sock_no_socketpair,
 	.accept		= sock_no_accept,
 	.getname	= ipx_getname,
-	.poll		= ipx_datagram_poll,
+	.poll		= datagram_poll,
 	.ioctl		= ipx_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl	= ipx_compat_ioctl,