linux-kernel - Re: [PATCH 01/10] bus/fsl-mc: Do no longer export the total number of irqs outside dprc_scan

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Message-ID: <6fbf30f3-9c45-dcef-b143-702c6ba017a6@oss.nxp.com>
Date:   Mon, 6 Apr 2020 17:46:19 +0300
From:   Diana Craciun OSS <diana.craciun@....nxp.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        "stuyoder@...il.com" <stuyoder@...il.com>,
        Leo Li <leoyang.li@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "bharatb.yadav@...il.com" <bharatb.yadav@...il.com>
Subject: Re: [PATCH 01/10] bus/fsl-mc: Do no longer export the total number of
 irqs outside dprc_scan_objects

Please ignore these patches. I have sent them again by mistake. I apologize!

Diana

On 4/6/2020 5:27 PM, Diana Craciun wrote:
> 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: