RDMA/cma: Simplify device removal handling code

Add a new routine and rename another to encapsulate common code for
synchronizing with device removal.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index fde92ce45153efc7eeb6a2cfc3f46e71bb9df82b..d026764c7e9c57e78429f0e315e48f25fc08e584 100644 (file)
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -346,7 +346,23 @@ static void cma_deref_id(struct rdma_id_private *id_priv)
                complete(&id_priv->comp);
 }
 
-static void cma_release_remove(struct rdma_id_private *id_priv)
+static int cma_disable_remove(struct rdma_id_private *id_priv,
+                             enum cma_state state)
+{
+       unsigned long flags;
+       int ret;
+
+       spin_lock_irqsave(&id_priv->lock, flags);
+       if (id_priv->state == state) {
+               atomic_inc(&id_priv->dev_remove);
+               ret = 0;
+       } else
+               ret = -EINVAL;
+       spin_unlock_irqrestore(&id_priv->lock, flags);
+       return ret;
+}
+
+static void cma_enable_remove(struct rdma_id_private *id_priv)
 {
        if (atomic_dec_and_test(&id_priv->dev_remove))
                wake_up(&id_priv->wait_remove);
@@ -884,9 +900,8 @@ static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
        struct rdma_cm_event event;
        int ret = 0;
 
-       atomic_inc(&id_priv->dev_remove);
-       if (!cma_comp(id_priv, CMA_CONNECT))
-               goto out;
+       if (cma_disable_remove(id_priv, CMA_CONNECT))
+               return 0;
 
        memset(&event, 0, sizeof event);
        switch (ib_event->event) {
@@ -942,12 +957,12 @@ static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
                /* Destroy the CM ID by returning a non-zero value. */
                id_priv->cm_id.ib = NULL;
                cma_exch(id_priv, CMA_DESTROYING);
-               cma_release_remove(id_priv);
+               cma_enable_remove(id_priv);
                rdma_destroy_id(&id_priv->id);
                return ret;
        }
 out:
-       cma_release_remove(id_priv);
+       cma_enable_remove(id_priv);
        return ret;
 }
 
@@ -1057,11 +1072,8 @@ static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
        int offset, ret;
 
        listen_id = cm_id->context;
-       atomic_inc(&listen_id->dev_remove);
-       if (!cma_comp(listen_id, CMA_LISTEN)) {
-               ret = -ECONNABORTED;
-               goto out;
-       }
+       if (cma_disable_remove(listen_id, CMA_LISTEN))
+               return -ECONNABORTED;
 
        memset(&event, 0, sizeof event);
        offset = cma_user_data_offset(listen_id->id.ps);
@@ -1101,11 +1113,11 @@ static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
 
 release_conn_id:
        cma_exch(conn_id, CMA_DESTROYING);
-       cma_release_remove(conn_id);
+       cma_enable_remove(conn_id);
        rdma_destroy_id(&conn_id->id);
 
 out:
-       cma_release_remove(listen_id);
+       cma_enable_remove(listen_id);
        return ret;
 }
 
@@ -1214,12 +1226,12 @@ static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
                /* Destroy the CM ID by returning a non-zero value. */
                id_priv->cm_id.iw = NULL;
                cma_exch(id_priv, CMA_DESTROYING);
-               cma_release_remove(id_priv);
+               cma_enable_remove(id_priv);
                rdma_destroy_id(&id_priv->id);
                return ret;
        }
 
-       cma_release_remove(id_priv);
+       cma_enable_remove(id_priv);
        return ret;
 }
 
@@ -1234,11 +1246,8 @@ static int iw_conn_req_handler(struct iw_cm_id *cm_id,
        int ret;
 
        listen_id = cm_id->context;
-       atomic_inc(&listen_id->dev_remove);
-       if (!cma_comp(listen_id, CMA_LISTEN)) {
-               ret = -ECONNABORTED;
-               goto out;
-       }
+       if (cma_disable_remove(listen_id, CMA_LISTEN))
+               return -ECONNABORTED;
 
        /* Create a new RDMA id for the new IW CM ID */
        new_cm_id = rdma_create_id(listen_id->id.event_handler,
@@ -1255,13 +1264,13 @@ static int iw_conn_req_handler(struct iw_cm_id *cm_id,
        dev = ip_dev_find(iw_event->local_addr.sin_addr.s_addr);
        if (!dev) {
                ret = -EADDRNOTAVAIL;
-               cma_release_remove(conn_id);
+               cma_enable_remove(conn_id);
                rdma_destroy_id(new_cm_id);
                goto out;
        }
        ret = rdma_copy_addr(&conn_id->id.route.addr.dev_addr, dev, NULL);
        if (ret) {
-               cma_release_remove(conn_id);
+               cma_enable_remove(conn_id);
                rdma_destroy_id(new_cm_id);
                goto out;
        }
@@ -1270,7 +1279,7 @@ static int iw_conn_req_handler(struct iw_cm_id *cm_id,
        ret = cma_acquire_dev(conn_id);
        mutex_unlock(&lock);
        if (ret) {
-               cma_release_remove(conn_id);
+               cma_enable_remove(conn_id);
                rdma_destroy_id(new_cm_id);
                goto out;
        }
@@ -1293,14 +1302,14 @@ static int iw_conn_req_handler(struct iw_cm_id *cm_id,
                /* User wants to destroy the CM ID */
                conn_id->cm_id.iw = NULL;
                cma_exch(conn_id, CMA_DESTROYING);
-               cma_release_remove(conn_id);
+               cma_enable_remove(conn_id);
                rdma_destroy_id(&conn_id->id);
        }
 
 out:
        if (dev)
                dev_put(dev);
-       cma_release_remove(listen_id);
+       cma_enable_remove(listen_id);
        return ret;
 }
 
@@ -1519,7 +1528,7 @@ static void cma_work_handler(struct work_struct *_work)
                destroy = 1;
        }
 out:
-       cma_release_remove(id_priv);
+       cma_enable_remove(id_priv);
        cma_deref_id(id_priv);
        if (destroy)
                rdma_destroy_id(&id_priv->id);
@@ -1711,13 +1720,13 @@ static void addr_handler(int status, struct sockaddr *src_addr,
 
        if (id_priv->id.event_handler(&id_priv->id, &event)) {
                cma_exch(id_priv, CMA_DESTROYING);
-               cma_release_remove(id_priv);
+               cma_enable_remove(id_priv);
                cma_deref_id(id_priv);
                rdma_destroy_id(&id_priv->id);
                return;
        }
 out:
-       cma_release_remove(id_priv);
+       cma_enable_remove(id_priv);
        cma_deref_id(id_priv);
 }
 
@@ -2042,11 +2051,10 @@ static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
        struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
        int ret = 0;
 
-       memset(&event, 0, sizeof event);
-       atomic_inc(&id_priv->dev_remove);
-       if (!cma_comp(id_priv, CMA_CONNECT))
-               goto out;
+       if (cma_disable_remove(id_priv, CMA_CONNECT))
+               return 0;
 
+       memset(&event, 0, sizeof event);
        switch (ib_event->event) {
        case IB_CM_SIDR_REQ_ERROR:
                event.event = RDMA_CM_EVENT_UNREACHABLE;
@@ -2084,12 +2092,12 @@ static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
                /* Destroy the CM ID by returning a non-zero value. */
                id_priv->cm_id.ib = NULL;
                cma_exch(id_priv, CMA_DESTROYING);
-               cma_release_remove(id_priv);
+               cma_enable_remove(id_priv);
                rdma_destroy_id(&id_priv->id);
                return ret;
        }
 out:
-       cma_release_remove(id_priv);
+       cma_enable_remove(id_priv);
        return ret;
 }
 
@@ -2499,10 +2507,9 @@ static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
        int ret;
 
        id_priv = mc->id_priv;
-       atomic_inc(&id_priv->dev_remove);
-       if (!cma_comp(id_priv, CMA_ADDR_BOUND) &&
-           !cma_comp(id_priv, CMA_ADDR_RESOLVED))
-               goto out;
+       if (cma_disable_remove(id_priv, CMA_ADDR_BOUND) &&
+           cma_disable_remove(id_priv, CMA_ADDR_RESOLVED))
+               return 0;
 
        if (!status && id_priv->id.qp)
                status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
@@ -2524,12 +2531,12 @@ static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
        ret = id_priv->id.event_handler(&id_priv->id, &event);
        if (ret) {
                cma_exch(id_priv, CMA_DESTROYING);
-               cma_release_remove(id_priv);
+               cma_enable_remove(id_priv);
                rdma_destroy_id(&id_priv->id);
                return 0;
        }
-out:
-       cma_release_remove(id_priv);
+
+       cma_enable_remove(id_priv);
        return 0;
 }