i40iw: Reorganize acquire/release of locks in i40iw_manage_apbvt

Commit f43c00c0 ("i40iw: Extend port reuse support for listeners")
introduces a sparse warning:

include/linux/spinlock.h:365:9: sparse: context imbalance in
'i40iw_manage_apbvt' - unexpected unlock

Fix this by reorganizing the acquire/release of locks in
i40iw_manage_apbvt and add a new function i40iw_cqp_manage_abvpt_cmd
to perform the CQP command. Also, use __clear_bit and __test_and_set_bit
as we do not need atomic versions.

Fixes: f43c00c0 ("i40iw: Extend port reuse support for listeners")
Suggested-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/i40iw/i40iw_hw.c

@@ -435,45 +435,24 @@ void i40iw_process_aeq(struct i40iw_device *iwdev)
 }
 
 /**
- * i40iw_manage_apbvt - add or delete tcp port
+ * i40iw_cqp_manage_abvpt_cmd - send cqp command manage abpvt
  * @iwdev: iwarp device
  * @accel_local_port: port for apbvt
  * @add_port: add or delete port
  */
-int i40iw_manage_apbvt(struct i40iw_device *iwdev, u16 accel_local_port, bool add_port)
+static enum i40iw_status_code
+i40iw_cqp_manage_abvpt_cmd(struct i40iw_device *iwdev,
+			   u16 accel_local_port,
+			   bool add_port)
 {
 	struct i40iw_apbvt_info *info;
 	struct i40iw_cqp_request *cqp_request;
 	struct cqp_commands_info *cqp_info;
-	unsigned long flags;
-	struct i40iw_cm_core *cm_core = &iwdev->cm_core;
-	enum i40iw_status_code status = 0;
-	bool in_use;
-
-	/* apbvt_lock is held across CQP delete APBVT OP (non-waiting) to
-	 * protect against race where add APBVT CQP can race ahead of the delete
-	 * APBVT for same port.
-	 */
-	spin_lock_irqsave(&cm_core->apbvt_lock, flags);
-
-	if (!add_port) {
-		in_use = i40iw_port_in_use(cm_core, accel_local_port);
-		if (in_use)
-			goto exit;
-		clear_bit(accel_local_port, cm_core->ports_in_use);
-	} else {
-		in_use = test_and_set_bit(accel_local_port,
-					  cm_core->ports_in_use);
-		spin_unlock_irqrestore(&cm_core->apbvt_lock, flags);
-		if (in_use)
-			return 0;
-	}
+	enum i40iw_status_code status;
 
 	cqp_request = i40iw_get_cqp_request(&iwdev->cqp, add_port);
-	if (!cqp_request) {
-		status = -ENOMEM;
-		goto exit;
-	}
+	if (!cqp_request)
+		return I40IW_ERR_NO_MEMORY;
 
 	cqp_info = &cqp_request->info;
 	info = &cqp_info->in.u.manage_apbvt_entry.info;
@@ -489,13 +468,53 @@ int i40iw_manage_apbvt(struct i40iw_device *iwdev, u16 accel_local_port, bool ad
 	status = i40iw_handle_cqp_op(iwdev, cqp_request);
 	if (status)
 		i40iw_pr_err("CQP-OP Manage APBVT entry fail");
-exit:
-	if (!add_port)
-		spin_unlock_irqrestore(&cm_core->apbvt_lock, flags);
 
 	return status;
 }
 
+/**
+ * i40iw_manage_apbvt - add or delete tcp port
+ * @iwdev: iwarp device
+ * @accel_local_port: port for apbvt
+ * @add_port: add or delete port
+ */
+enum i40iw_status_code i40iw_manage_apbvt(struct i40iw_device *iwdev,
+					  u16 accel_local_port,
+					  bool add_port)
+{
+	struct i40iw_cm_core *cm_core = &iwdev->cm_core;
+	enum i40iw_status_code status;
+	unsigned long flags;
+	bool in_use;
+
+	/* apbvt_lock is held across CQP delete APBVT OP (non-waiting) to
+	 * protect against race where add APBVT CQP can race ahead of the delete
+	 * APBVT for same port.
+	 */
+	if (add_port) {
+		spin_lock_irqsave(&cm_core->apbvt_lock, flags);
+		in_use = __test_and_set_bit(accel_local_port,
+					    cm_core->ports_in_use);
+		spin_unlock_irqrestore(&cm_core->apbvt_lock, flags);
+		if (in_use)
+			return 0;
+		return i40iw_cqp_manage_abvpt_cmd(iwdev, accel_local_port,
+						  true);
+	} else {
+		spin_lock_irqsave(&cm_core->apbvt_lock, flags);
+		in_use = i40iw_port_in_use(cm_core, accel_local_port);
+		if (in_use) {
+			spin_unlock_irqrestore(&cm_core->apbvt_lock, flags);
+			return 0;
+		}
+		__clear_bit(accel_local_port, cm_core->ports_in_use);
+		status = i40iw_cqp_manage_abvpt_cmd(iwdev, accel_local_port,
+						    false);
+		spin_unlock_irqrestore(&cm_core->apbvt_lock, flags);
+		return status;
+	}
+}
+
 /**
  * i40iw_manage_arp_cache - manage hw arp cache
  * @iwdev: iwarp device