[NETLINK]: Switch cb_lock spinlock to mutex and allow to override it

Switch cb_lock to mutex and allow netlink kernel users to override it
with a subsystem specific mutex for consistent locking in dump callbacks.
All netlink_dump_start users have been audited not to rely on any
side-effects of the previously used spinlock.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 4 insertions, 3 deletions

diff --git a/drivers/connector/connector.c b/drivers/connector/connector.c
index 7f9c4fb7e5b0..a7b9e9bb3e8d 100644
--- a/drivers/connector/connector.c
+++ b/drivers/connector/connector.c
@@ -448,7 +448,7 @@ static int __devinit cn_init(void)
 
         dev->nls = netlink_kernel_create(NETLINK_CONNECTOR,
                                          CN_NETLINK_USERS + 0xf,
-                                         dev->input, THIS_MODULE);
+                                         dev->input, NULL, THIS_MODULE);
         if (!dev->nls)
                 return -EIO;
 
diff --git a/drivers/scsi/scsi_netlink.c b/drivers/scsi/scsi_netlink.c
index 45646a285244..4bf9aa547c78 100644
--- a/drivers/scsi/scsi_netlink.c
+++ b/drivers/scsi/scsi_netlink.c
@@ -168,7 +168,8 @@ scsi_netlink_init(void)
         }
 
         scsi_nl_sock = netlink_kernel_create(NETLINK_SCSITRANSPORT,
-                                SCSI_NL_GRP_CNT, scsi_nl_rcv, THIS_MODULE);
+                                SCSI_NL_GRP_CNT, scsi_nl_rcv, NULL,
+                                THIS_MODULE);
         if (!scsi_nl_sock) {
                 printk(KERN_ERR "%s: register of recieve handler failed\n",
                                 __FUNCTION__);
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index 10590cd7e9ed..aabaa0576ab4 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -1435,7 +1435,7 @@ static __init int iscsi_transport_init(void)
         if (err)
                 goto unregister_conn_class;
 
-        nls = netlink_kernel_create(NETLINK_ISCSI, 1, iscsi_if_rx,
+        nls = netlink_kernel_create(NETLINK_ISCSI, 1, iscsi_if_rx, NULL,
                         THIS_MODULE);
         if (!nls) {
                 err = -ENOBUFS;