appletalk: remove the BKL

This changes appletalk to use lock_sock instead of
lock_kernel for serialization. I tried to make sure
that we don't hold the socket lock during sleeping
functions, but I did not try to prove whether the
locks are necessary in the first place.

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: David Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org

1 files changed, 16 insertions, 24 deletions

diff --git a/net/appletalk/ddp.c b/net/appletalk/ddp.c
index c410b93fda2e..3d4f4b043406 100644
--- a/net/appletalk/ddp.c
+++ b/net/appletalk/ddp.c
@@ -54,7 +54,6 @@
 #include <linux/capability.h>
 #include <linux/module.h>
 #include <linux/if_arp.h>
-#include <linux/smp_lock.h>
 #include <linux/termios.h>      /* For TIOCOUTQ/INQ */
 #include <linux/compat.h>
 #include <linux/slab.h>
@@ -1052,13 +1051,13 @@ static int atalk_release(struct socket *sock)
 {
         struct sock *sk = sock->sk;
 
-        lock_kernel();
+        lock_sock(sk);
         if (sk) {
                 sock_orphan(sk);
                 sock->sk = NULL;
                 atalk_destroy_socket(sk);
         }
-        unlock_kernel();
+        release_sock(sk);
         return 0;
 }
 
@@ -1143,7 +1142,7 @@ static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
         if (addr->sat_family != AF_APPLETALK)
                 return -EAFNOSUPPORT;
 
-        lock_kernel();
+        lock_sock(sk);
         if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) {
                 struct atalk_addr *ap = atalk_find_primary();
 
@@ -1179,7 +1178,7 @@ static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
         sock_reset_flag(sk, SOCK_ZAPPED);
         err = 0;
 out:
-        unlock_kernel();
+        release_sock(sk);
         return err;
 }
 
@@ -1215,7 +1214,7 @@ static int atalk_connect(struct socket *sock, struct sockaddr *uaddr,
 #endif
         }
 
-        lock_kernel();
+        lock_sock(sk);
         err = -EBUSY;
         if (sock_flag(sk, SOCK_ZAPPED))
                 if (atalk_autobind(sk) < 0)
@@ -1233,7 +1232,7 @@ static int atalk_connect(struct socket *sock, struct sockaddr *uaddr,
         sk->sk_state = TCP_ESTABLISHED;
         err = 0;
 out:
-        unlock_kernel();
+        release_sock(sk);
         return err;
 }
 
@@ -1249,7 +1248,7 @@ static int atalk_getname(struct socket *sock, struct sockaddr *uaddr,
         struct atalk_sock *at = at_sk(sk);
         int err;
 
-        lock_kernel();
+        lock_sock(sk);
         err = -ENOBUFS;
         if (sock_flag(sk, SOCK_ZAPPED))
                 if (atalk_autobind(sk) < 0)
@@ -1277,17 +1276,7 @@ static int atalk_getname(struct socket *sock, struct sockaddr *uaddr,
         memcpy(uaddr, &sat, sizeof(sat));
 
 out:
-        unlock_kernel();
-        return err;
-}
-
-static unsigned int atalk_poll(struct file *file, struct socket *sock,
-                           poll_table *wait)
-{
-        int err;
-        lock_kernel();
-        err = datagram_poll(file, sock, wait);
-        unlock_kernel();
+        release_sock(sk);
         return err;
 }
 
@@ -1596,7 +1585,7 @@ static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr
         if (len > DDP_MAXSZ)
                 return -EMSGSIZE;
 
-        lock_kernel();
+        lock_sock(sk);
         if (usat) {
                 err = -EBUSY;
                 if (sock_flag(sk, SOCK_ZAPPED))
@@ -1651,7 +1640,9 @@ static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr
                         sk, size, dev->name);
 
         size += dev->hard_header_len;
+        release_sock(sk);
         skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err);
+        lock_sock(sk);
         if (!skb)
                 goto out;
 
@@ -1738,7 +1729,7 @@ static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr
         SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len);
 
 out:
-        unlock_kernel();
+        release_sock(sk);
         return err ? : len;
 }
 
@@ -1753,9 +1744,10 @@ static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr
         int err = 0;
         struct sk_buff *skb;
 
-        lock_kernel();
         skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
                                                 flags & MSG_DONTWAIT, &err);
+        lock_sock(sk);
+
         if (!skb)
                 goto out;
 
@@ -1787,7 +1779,7 @@ static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr
         skb_free_datagram(sk, skb);     /* Free the datagram. */
 
 out:
-        unlock_kernel();
+        release_sock(sk);
         return err ? : copied;
 }
 
@@ -1887,7 +1879,7 @@ static const struct proto_ops atalk_dgram_ops = {
         .socketpair     = sock_no_socketpair,
         .accept         = sock_no_accept,
         .getname        = atalk_getname,
-        .poll           = atalk_poll,
+        .poll           = datagram_poll,
         .ioctl          = atalk_ioctl,
 #ifdef CONFIG_COMPAT
         .compat_ioctl   = atalk_compat_ioctl,