linux-kernel - [PATCH v3] staging: gasket: core: Fix a coding style issue in gasket

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Date:   Wed, 15 Jul 2020 21:33:13 +0800
From:   Zhixu Zhao <zhixu001@....com>
To:     devel@...verdev.osuosl.org, gregkh@...uxfoundation.org,
        joe@...ches.com, linux-kernel@...r.kernel.org, rcy@...gle.com,
        rspringer@...gle.com, toddpoynor@...gle.com,
        dan.carpenter@...cle.com
Cc:     zhixu001@....com
Subject: [PATCH v3] staging: gasket: core: Fix a coding style issue in gasket_core.c

A coding alignment issue is found by checkpatch.pl.
Fix it by using a temporary for gasket_dev->bar_data[bar_num].

Signed-off-by: Zhixu Zhao <zhixu001@....com>
---

Changes in v2:
  - gasket_dev->bar_data[bar_num] was used everywhere. Now replace it
    with a `struct gasket_bar_data *data`, making the code more elegant.
    Thanks to Joe Perches.

About v3:
  - Resolved all comments in v2. Resending it...

 drivers/staging/gasket/gasket_core.c | 29 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 15 deletions(-)

diff --git a/drivers/staging/gasket/gasket_core.c b/drivers/staging/gasket/gasket_core.c
index 67325fbaf760..28dab302183b 100644
--- a/drivers/staging/gasket/gasket_core.c
+++ b/drivers/staging/gasket/gasket_core.c
@@ -261,6 +261,7 @@ static int gasket_map_pci_bar(struct gasket_dev *gasket_dev, int bar_num)
 	const struct gasket_driver_desc *driver_desc =
 		internal_desc->driver_desc;
 	ulong desc_bytes = driver_desc->bar_descriptions[bar_num].size;
+	struct gasket_bar_data *data;
 	int ret;
 
 	if (desc_bytes == 0)
@@ -270,31 +271,32 @@ static int gasket_map_pci_bar(struct gasket_dev *gasket_dev, int bar_num)
 		/* not PCI: skip this entry */
 		return 0;
 	}
+
+	data = &gasket_dev->bar_data[bar_num];
+
 	/*
 	 * pci_resource_start and pci_resource_len return a "resource_size_t",
 	 * which is safely castable to ulong (which itself is the arg to
 	 * request_mem_region).
 	 */
-	gasket_dev->bar_data[bar_num].phys_base =
+	data->phys_base =
 		(ulong)pci_resource_start(gasket_dev->pci_dev, bar_num);
-	if (!gasket_dev->bar_data[bar_num].phys_base) {
+	if (!data->phys_base) {
 		dev_err(gasket_dev->dev, "Cannot get BAR%u base address\n",
 			bar_num);
 		return -EINVAL;
 	}
 
-	gasket_dev->bar_data[bar_num].length_bytes =
+	data->length_bytes =
 		(ulong)pci_resource_len(gasket_dev->pci_dev, bar_num);
-	if (gasket_dev->bar_data[bar_num].length_bytes < desc_bytes) {
+	if (data->length_bytes < desc_bytes) {
 		dev_err(gasket_dev->dev,
 			"PCI BAR %u space is too small: %lu; expected >= %lu\n",
-			bar_num, gasket_dev->bar_data[bar_num].length_bytes,
-			desc_bytes);
+			bar_num, data->length_bytes, desc_bytes);
 		return -ENOMEM;
 	}
 
-	if (!request_mem_region(gasket_dev->bar_data[bar_num].phys_base,
-				gasket_dev->bar_data[bar_num].length_bytes,
+	if (!request_mem_region(data->phys_base, data->length_bytes,
 				gasket_dev->dev_info.name)) {
 		dev_err(gasket_dev->dev,
 			"Cannot get BAR %d memory region %p\n",
@@ -302,10 +304,8 @@ static int gasket_map_pci_bar(struct gasket_dev *gasket_dev, int bar_num)
 		return -EINVAL;
 	}
 
-	gasket_dev->bar_data[bar_num].virt_base =
-		ioremap(gasket_dev->bar_data[bar_num].phys_base,
-				gasket_dev->bar_data[bar_num].length_bytes);
-	if (!gasket_dev->bar_data[bar_num].virt_base) {
+	data->virt_base = ioremap(data->phys_base, data->length_bytes);
+	if (!data->virt_base) {
 		dev_err(gasket_dev->dev,
 			"Cannot remap BAR %d memory region %p\n",
 			bar_num, &gasket_dev->pci_dev->resource[bar_num]);
@@ -319,9 +319,8 @@ static int gasket_map_pci_bar(struct gasket_dev *gasket_dev, int bar_num)
 	return 0;
 
 fail:
-	iounmap(gasket_dev->bar_data[bar_num].virt_base);
-	release_mem_region(gasket_dev->bar_data[bar_num].phys_base,
-			   gasket_dev->bar_data[bar_num].length_bytes);
+	iounmap(data->virt_base);
+	release_mem_region(data->phys_base, data->length_bytes);
 	return ret;
 }
 
-- 
2.17.1