linux-kernel - [PATCH rdma-next v3 3/8] IB/cm: Call the correct message free functions in cm_send

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Date:   Tue, 11 May 2021 11:22:07 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>
Cc:     linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
        Mark Zhang <markzhang@...dia.com>,
        Sean Hefty <sean.hefty@...el.com>
Subject: [PATCH rdma-next v3 3/8] IB/cm: Call the correct message free functions in cm_send_handler()

From: Jason Gunthorpe <jgg@...dia.com>

There are now three destroy functions for the cm_msg, and all places
except the general send completion handler use the correct function.

Fix cm_send_handler() to detect which kind of message is being completed
and destroy it using the correct function with the correct locking.

Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Leon Romanovsky <leonro@...dia.com>
---
 drivers/infiniband/core/cm.c | 52 +++++++++++++++++-------------------
 1 file changed, 25 insertions(+), 27 deletions(-)

diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c
index 94613275edcc..8dbc39ea4612 100644
--- a/drivers/infiniband/core/cm.c
+++ b/drivers/infiniband/core/cm.c
@@ -3795,22 +3795,26 @@ static int cm_sidr_rep_handler(struct cm_work *work)
 	return -EINVAL;
 }
 
-static void cm_process_send_error(struct ib_mad_send_buf *msg,
+static void cm_process_send_error(struct cm_id_private *cm_id_priv,
+				  struct ib_mad_send_buf *msg,
+				  enum ib_cm_state state,
 				  enum ib_wc_status wc_status)
 {
-	struct cm_id_private *cm_id_priv;
-	struct ib_cm_event cm_event;
-	enum ib_cm_state state;
+	struct ib_cm_event cm_event = {};
 	int ret;
 
-	memset(&cm_event, 0, sizeof cm_event);
-	cm_id_priv = msg->context[0];
-
 	/* Discard old sends or ones without a response. */
 	spin_lock_irq(&cm_id_priv->lock);
-	state = (enum ib_cm_state) (unsigned long) msg->context[1];
-	if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
-		goto discard;
+	if (msg != cm_id_priv->msg) {
+		spin_unlock_irq(&cm_id_priv->lock);
+		cm_free_msg(msg);
+		return;
+	}
+	cm_free_priv_msg(msg);
+
+	if (state != cm_id_priv->id.state || wc_status == IB_WC_SUCCESS ||
+	    wc_status == IB_WC_WR_FLUSH_ERR)
+		goto out_unlock;
 
 	trace_icm_mad_send_err(state, wc_status);
 	switch (state) {
@@ -3833,26 +3837,27 @@ static void cm_process_send_error(struct ib_mad_send_buf *msg,
 		cm_event.event = IB_CM_SIDR_REQ_ERROR;
 		break;
 	default:
-		goto discard;
+		goto out_unlock;
 	}
 	spin_unlock_irq(&cm_id_priv->lock);
 	cm_event.param.send_status = wc_status;
 
 	/* No other events can occur on the cm_id at this point. */
 	ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
-	cm_free_msg(msg);
 	if (ret)
 		ib_destroy_cm_id(&cm_id_priv->id);
 	return;
-discard:
+out_unlock:
 	spin_unlock_irq(&cm_id_priv->lock);
-	cm_free_msg(msg);
 }
 
 static void cm_send_handler(struct ib_mad_agent *mad_agent,
 			    struct ib_mad_send_wc *mad_send_wc)
 {
 	struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
+	struct cm_id_private *cm_id_priv = msg->context[0];
+	enum ib_cm_state state =
+		(enum ib_cm_state)(unsigned long)msg->context[1];
 	struct cm_port *port;
 	u16 attr_index;
 
@@ -3865,7 +3870,7 @@ static void cm_send_handler(struct ib_mad_agent *mad_agent,
 	 * set to a cm_id), and is not a REJ, then it is a send that was
 	 * manually retried.
 	 */
-	if (!msg->context[0] && (attr_index != CM_REJ_COUNTER))
+	if (!cm_id_priv && (attr_index != CM_REJ_COUNTER))
 		msg->retries = 1;
 
 	atomic_long_add(1 + msg->retries,
@@ -3875,18 +3880,11 @@ static void cm_send_handler(struct ib_mad_agent *mad_agent,
 				&port->counter_group[CM_XMIT_RETRIES].
 				counter[attr_index]);
 
-	switch (mad_send_wc->status) {
-	case IB_WC_SUCCESS:
-	case IB_WC_WR_FLUSH_ERR:
-		cm_free_msg(msg);
-		break;
-	default:
-		if (msg->context[0] && msg->context[1])
-			cm_process_send_error(msg, mad_send_wc->status);
-		else
-			cm_free_msg(msg);
-		break;
-	}
+	if (cm_id_priv)
+		cm_process_send_error(cm_id_priv, msg, state,
+				      mad_send_wc->status);
+	else
+		cm_free_response_msg(msg);
 }
 
 static void cm_work_handler(struct work_struct *_work)
-- 
2.31.1