linux-kernel - [PATCH v2 01/12] bus/fsl-mc: Do no longer export the total number of irqs outside dprc_scan

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Date:   Thu,  7 May 2020 10:34:20 +0300
From:   Diana Craciun <diana.craciun@....nxp.com>
To:     linux-kernel@...r.kernel.org
Cc:     laurentiu.tudor@....com, stuyoder@...il.com, leoyang.li@....com,
        linux-arm-kernel@...ts.infradead.org, gregkh@...uxfoundation.org,
        Diana Craciun <diana.craciun@....nxp.com>
Subject: [PATCH v2 01/12] bus/fsl-mc: Do no longer export the total number of irqs outside dprc_scan_objects

The total number of interrupts is only used for some checks
outside the dprc_scan_objects function. Furthermore, in some
situations the check is made twice. Move the bounds check inside
the function for all situations.

Signed-off-by: Diana Craciun <diana.craciun@....nxp.com>
---
 drivers/bus/fsl-mc/dprc-driver.c | 30 ++++++++++--------------------
 1 file changed, 10 insertions(+), 20 deletions(-)

diff --git a/drivers/bus/fsl-mc/dprc-driver.c b/drivers/bus/fsl-mc/dprc-driver.c
index c8b1c3842c1a..035b220779d0 100644
--- a/drivers/bus/fsl-mc/dprc-driver.c
+++ b/drivers/bus/fsl-mc/dprc-driver.c
@@ -3,6 +3,7 @@
  * Freescale data path resource container (DPRC) driver
  *
  * Copyright (C) 2014-2016 Freescale Semiconductor, Inc.
+ * Copyright 2019-2020 NXP
  * Author: German Rivera <German.Rivera@...escale.com>
  *
  */
@@ -197,8 +198,6 @@ static void dprc_add_new_devices(struct fsl_mc_device *mc_bus_dev,
  * dprc_scan_objects - Discover objects in a DPRC
  *
  * @mc_bus_dev: pointer to the fsl-mc device that represents a DPRC object
- * @total_irq_count: If argument is provided the function populates the
- * total number of IRQs created by objects in the DPRC.
  *
  * Detects objects added and removed from a DPRC and synchronizes the
  * state of the Linux bus driver, MC by adding and removing
@@ -212,8 +211,7 @@ static void dprc_add_new_devices(struct fsl_mc_device *mc_bus_dev,
  * populated before they can get allocation requests from probe callbacks
  * of the device drivers for the non-allocatable devices.
  */
-static int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,
-			     unsigned int *total_irq_count)
+static int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev)
 {
 	int num_child_objects;
 	int dprc_get_obj_failures;
@@ -294,22 +292,21 @@ static int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,
 	 * Allocate IRQ's before binding the scanned devices with their
 	 * respective drivers.
 	 */
-	if (dev_get_msi_domain(&mc_bus_dev->dev) && !mc_bus->irq_resources) {
+	if (dev_get_msi_domain(&mc_bus_dev->dev)) {
 		if (irq_count > FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS) {
 			dev_warn(&mc_bus_dev->dev,
 				 "IRQs needed (%u) exceed IRQs preallocated (%u)\n",
 				 irq_count, FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS);
 		}
 
-		error = fsl_mc_populate_irq_pool(mc_bus,
+		if (!mc_bus->irq_resources) {
+			error = fsl_mc_populate_irq_pool(mc_bus,
 				FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS);
-		if (error < 0)
-			return error;
+			if (error < 0)
+				return error;
+		}
 	}
 
-	if (total_irq_count)
-		*total_irq_count = irq_count;
-
 	dprc_remove_devices(mc_bus_dev, child_obj_desc_array,
 			    num_child_objects);
 
@@ -342,7 +339,7 @@ static int dprc_scan_container(struct fsl_mc_device *mc_bus_dev)
 	 * Discover objects in the DPRC:
 	 */
 	mutex_lock(&mc_bus->scan_mutex);
-	error = dprc_scan_objects(mc_bus_dev, NULL);
+	error = dprc_scan_objects(mc_bus_dev);
 	mutex_unlock(&mc_bus->scan_mutex);
 	if (error < 0) {
 		fsl_mc_cleanup_all_resource_pools(mc_bus_dev);
@@ -411,9 +408,8 @@ static irqreturn_t dprc_irq0_handler_thread(int irq_num, void *arg)
 		      DPRC_IRQ_EVENT_CONTAINER_DESTROYED |
 		      DPRC_IRQ_EVENT_OBJ_DESTROYED |
 		      DPRC_IRQ_EVENT_OBJ_CREATED)) {
-		unsigned int irq_count;
 
-		error = dprc_scan_objects(mc_dev, &irq_count);
+		error = dprc_scan_objects(mc_dev);
 		if (error < 0) {
 			/*
 			 * If the error is -ENXIO, we ignore it, as it indicates
@@ -428,12 +424,6 @@ static irqreturn_t dprc_irq0_handler_thread(int irq_num, void *arg)
 
 			goto out;
 		}
-
-		if (irq_count > FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS) {
-			dev_warn(dev,
-				 "IRQs needed (%u) exceed IRQs preallocated (%u)\n",
-				 irq_count, FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS);
-		}
 	}
 
 out:
-- 
2.17.1