linux-kernel - [PATCH v4 08/13] bus/fsl-mc: Export a cleanup function for DPRC

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Message-Id: <20200826092527.4992-9-diana.craciun@oss.nxp.com>
Date:   Wed, 26 Aug 2020 12:25:22 +0300
From:   Diana Craciun <diana.craciun@....nxp.com>
To:     linux-kernel@...r.kernel.org, laurentiu.tudor@....com
Cc:     stuyoder@...il.com, leoyang.li@....com, gregkh@...uxfoundation.org,
        linux-arm-kernel@...ts.infradead.org, bharatb.linux@...il.com,
        Diana Craciun <diana.craciun@....nxp.com>
Subject: [PATCH v4 08/13] bus/fsl-mc: Export a cleanup function for DPRC

Create and export a cleanup function for DPRC. The function
is used by the DPRC driver, but it will be used by the VFIO
driver as well.

Signed-off-by: Diana Craciun <diana.craciun@....nxp.com>
---
 drivers/bus/fsl-mc/dprc-driver.c | 52 ++++++++++++++++++++++++--------
 include/linux/fsl/mc.h           |  2 ++
 2 files changed, 41 insertions(+), 13 deletions(-)

diff --git a/drivers/bus/fsl-mc/dprc-driver.c b/drivers/bus/fsl-mc/dprc-driver.c
index dde8fe965e30..6d7b9412fb77 100644
--- a/drivers/bus/fsl-mc/dprc-driver.c
+++ b/drivers/bus/fsl-mc/dprc-driver.c
@@ -728,33 +728,25 @@ static void dprc_teardown_irq(struct fsl_mc_device *mc_dev)
 }
 
 /**
- * dprc_remove - callback invoked when a DPRC is being unbound from this driver
+ * dprc_cleanup - function that cleanups a DPRC
  *
  * @mc_dev: Pointer to fsl-mc device representing the DPRC
  *
- * It removes the DPRC's child objects from Linux (not from the MC) and
- * closes the DPRC device in the MC.
- * It tears down the interrupts that were configured for the DPRC device.
+ * It closes the DPRC device in the MC.
  * It destroys the interrupt pool associated with this MC bus.
  */
-static int dprc_remove(struct fsl_mc_device *mc_dev)
+
+int dprc_cleanup(struct fsl_mc_device *mc_dev)
 {
 	int error;
 	struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
 
 	if (!is_fsl_mc_bus_dprc(mc_dev))
 		return -EINVAL;
-	if (!mc_dev->mc_io)
-		return -EINVAL;
 
-	if (!mc_bus->irq_resources)
+	if (!mc_dev->mc_io)
 		return -EINVAL;
 
-	if (dev_get_msi_domain(&mc_dev->dev))
-		dprc_teardown_irq(mc_dev);
-
-	device_for_each_child(&mc_dev->dev, NULL, __fsl_mc_device_remove);
-
 	if (dev_get_msi_domain(&mc_dev->dev)) {
 		fsl_mc_cleanup_irq_pool(mc_bus);
 		dev_set_msi_domain(&mc_dev->dev, NULL);
@@ -771,6 +763,40 @@ static int dprc_remove(struct fsl_mc_device *mc_dev)
 		mc_dev->mc_io = NULL;
 	}
 
+	return 0;
+}
+EXPORT_SYMBOL_GPL(dprc_cleanup);
+
+/**
+ * dprc_remove - callback invoked when a DPRC is being unbound from this driver
+ *
+ * @mc_dev: Pointer to fsl-mc device representing the DPRC
+ *
+ * It removes the DPRC's child objects from Linux (not from the MC) and
+ * closes the DPRC device in the MC.
+ * It tears down the interrupts that were configured for the DPRC device.
+ * It destroys the interrupt pool associated with this MC bus.
+ */
+static int dprc_remove(struct fsl_mc_device *mc_dev)
+{
+	int error;
+	struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
+
+	if (!is_fsl_mc_bus_dprc(mc_dev))
+		return -EINVAL;
+
+	if (!mc_bus->irq_resources)
+		return -EINVAL;
+
+	if (dev_get_msi_domain(&mc_dev->dev))
+		dprc_teardown_irq(mc_dev);
+
+	device_for_each_child(&mc_dev->dev, NULL, __fsl_mc_device_remove);
+
+	error = dprc_cleanup(mc_dev);
+	if (error < 0)
+		dev_err(&mc_dev->dev, "dprc_close() failed: %d\n", error);
+
 	dev_info(&mc_dev->dev, "DPRC device unbound from driver");
 	return 0;
 }
diff --git a/include/linux/fsl/mc.h b/include/linux/fsl/mc.h
index da11171bc38f..5519a510b8c9 100644
--- a/include/linux/fsl/mc.h
+++ b/include/linux/fsl/mc.h
@@ -538,6 +538,8 @@ void dprc_remove_devices(struct fsl_mc_device *mc_bus_dev,
 			 struct fsl_mc_obj_desc *obj_desc_array,
 			 int num_child_objects_in_mc);
 
+int dprc_cleanup(struct fsl_mc_device *mc_dev);
+
 /*
  * Data Path Buffer Pool (DPBP) API
  * Contains initialization APIs and runtime control APIs for DPBP
-- 
2.17.1