RDMA/cxgb4: Convert timers to use timer_setup()

In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly. Also removes an unused timer and
drops a redundant initialization.

Cc: Steve Wise <swise@chelsio.com>
Cc: Doug Ledford <dledford@redhat.com>
Cc: Sean Hefty <sean.hefty@intel.com>
Cc: Hal Rosenstock <hal.rosenstock@gmail.com>
Cc: linux-rdma@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/cxgb4/cm.c

@@ -144,7 +144,7 @@ static struct workqueue_struct *workq;
 static struct sk_buff_head rxq;
 
 static struct sk_buff *get_skb(struct sk_buff *skb, int len, gfp_t gfp);
-static void ep_timeout(unsigned long arg);
+static void ep_timeout(struct timer_list *t);
 static void connect_reply_upcall(struct c4iw_ep *ep, int status);
 static int sched(struct c4iw_dev *dev, struct sk_buff *skb);
 
@@ -189,8 +189,6 @@ static void start_ep_timer(struct c4iw_ep *ep)
 	clear_bit(TIMEOUT, &ep->com.flags);
 	c4iw_get_ep(&ep->com);
 	ep->timer.expires = jiffies + ep_timeout_secs * HZ;
-	ep->timer.data = (unsigned long)ep;
-	ep->timer.function = ep_timeout;
 	add_timer(&ep->timer);
 }
 
@@ -2101,7 +2099,6 @@ static int c4iw_reconnect(struct c4iw_ep *ep)
 	__u8 *ra;
 
 	pr_debug("%s qp %p cm_id %p\n", __func__, ep->com.qp, ep->com.cm_id);
-	init_timer(&ep->timer);
 	c4iw_init_wr_wait(&ep->com.wr_wait);
 
 	/* When MPA revision is different on nodes, the node with MPA_rev=2
@@ -2579,7 +2576,7 @@ static int pass_accept_req(struct c4iw_dev *dev, struct sk_buff *skb)
 	pr_debug("%s tx_chan %u smac_idx %u rss_qid %u\n", __func__,
 		 child_ep->tx_chan, child_ep->smac_idx, child_ep->rss_qid);
 
-	init_timer(&child_ep->timer);
+	timer_setup(&child_ep->timer, ep_timeout, 0);
 	cxgb4_insert_tid(t, child_ep, hwtid,
 			 child_ep->com.local_addr.ss_family);
 	insert_ep_tid(child_ep);
@@ -3204,7 +3201,7 @@ int c4iw_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
 		goto fail1;
 	}
 
-	init_timer(&ep->timer);
+	timer_setup(&ep->timer, ep_timeout, 0);
 	ep->plen = conn_param->private_data_len;
 	if (ep->plen)
 		memcpy(ep->mpa_pkt + sizeof(struct mpa_message),
@@ -4119,9 +4116,9 @@ static void process_work(struct work_struct *work)
 
 static DECLARE_WORK(skb_work, process_work);
 
-static void ep_timeout(unsigned long arg)
+static void ep_timeout(struct timer_list *t)
 {
-	struct c4iw_ep *ep = (struct c4iw_ep *)arg;
+	struct c4iw_ep *ep = from_timer(ep, t, timer);
 	int kickit = 0;
 
 	spin_lock(&timeout_lock);

drivers/infiniband/hw/cxgb4/iw_cxgb4.h

@@ -480,7 +480,6 @@ struct c4iw_qp {
 	struct mutex mutex;
 	struct kref kref;
 	wait_queue_head_t wait;
-	struct timer_list timer;
 	int sq_sig_all;
 	struct work_struct free_work;
 	struct c4iw_ucontext *ucontext;

drivers/infiniband/hw/cxgb4/qp.c

@@ -1935,7 +1935,6 @@ struct ib_qp *c4iw_create_qp(struct ib_pd *pd, struct ib_qp_init_attr *attrs,
 		qhp->ucontext = ucontext;
 	}
 	qhp->ibqp.qp_num = qhp->wq.sq.qid;
-	init_timer(&(qhp->timer));
 	INIT_LIST_HEAD(&qhp->db_fc_entry);
 	pr_debug("%s sq id %u size %u memsize %zu num_entries %u rq id %u size %u memsize %zu num_entries %u\n",
 		 __func__,