RDMA/{cma, core}: Avoid callback on rdma_addr_cancel()

Currently rdma_addr_cancel() is an async operation, which notifies that
cancel is done by executing the callback function given during
rdma_resolve_ip(). If resolve_ip request is already completed than
callback is not executed.

Instead, now rdma_resolve_addr() and rdma_addr_cancel() simplified in
following ways.
1. rdma_addr_cancel() now a synchronous method. If request was
pending, after it is cancelled, no callback is notified.
2. rdma_resolve_addr() and respective addr_handler() callback doesn't
need to hold reference to cm_id.

Signed-off-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
index 46b855a..94ff387 100644 (file)
--- a/drivers/infiniband/core/addr.c
+++ b/drivers/infiniband/core/addr.c
@@ -660,6 +660,13 @@ int rdma_resolve_ip_route(struct sockaddr *src_addr,
        return addr_resolve(src_in, dst_addr, addr, false, 0);
 }
 
+/**
+ * rdma_addr_cancel - Cancel resolve ip request
+ * @addr:      Pointer to address structure given previously
+ *             during rdma_resolve_ip().
+ * rdma_addr_cancel() is synchronous function which cancels any pending
+ * request if there is any.
+ */
 void rdma_addr_cancel(struct rdma_dev_addr *addr)
 {
        struct addr_req *req, *temp_req;
@@ -687,11 +694,6 @@ void rdma_addr_cancel(struct rdma_dev_addr *addr)
         * guarentees no work is running and none will be started.
         */
        cancel_delayed_work_sync(&found->work);
-
-       if (found->callback)
-               found->callback(-ECANCELED, (struct sockaddr *)&found->src_addr,
-                             found->addr, found->context);
-
        kfree(found);
 }
 EXPORT_SYMBOL(rdma_addr_cancel);

diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index f726772..4ba77f4 100644 (file)
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -2880,13 +2880,11 @@ static void addr_handler(int status, struct sockaddr *src_addr,
        if (id_priv->id.event_handler(&id_priv->id, &event)) {
                cma_exch(id_priv, RDMA_CM_DESTROYING);
                mutex_unlock(&id_priv->handler_mutex);
-               cma_deref_id(id_priv);
                rdma_destroy_id(&id_priv->id);
                return;
        }
 out:
        mutex_unlock(&id_priv->handler_mutex);
-       cma_deref_id(id_priv);
 }
 
 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
@@ -2983,7 +2981,6 @@ int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
                return -EINVAL;
 
        memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr));
-       atomic_inc(&id_priv->refcount);
        if (cma_any_addr(dst_addr)) {
                ret = cma_resolve_loopback(id_priv);
        } else {
@@ -3001,7 +2998,6 @@ int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
        return 0;
 err:
        cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
-       cma_deref_id(id_priv);
        return ret;
 }
 EXPORT_SYMBOL(rdma_resolve_addr);