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Message-Id: <20240814-b4-cleanup-h-of-node-put-usb-v1-1-95481b9682bc@linaro.org>
Date: Wed, 14 Aug 2024 12:35:37 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Patrice Chotard <patrice.chotard@...s.st.com>,
Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>, Michal Simek <michal.simek@....com>
Cc: linux-arm-kernel@...ts.infradead.org, linux-usb@...r.kernel.org,
linux-kernel@...r.kernel.org, imx@...ts.linux.dev,
linux-arm-msm@...r.kernel.org,
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH 01/11] usb: dwc3: st: use scoped device node handling to
simplify error paths
Obtain the device node reference with scoped/cleanup.h to reduce error
handling and make the code a bit simpler. Scoped/cleanup.h coding style
expects variable declaration with initialization, so the
of_get_compatible_child() call has to be moved earlier, before any goto
jumps happen.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
This depends on my earlier fix:
https://lore.kernel.org/all/20240814093957.37940-2-krzysztof.kozlowski@linaro.org/
---
drivers/usb/dwc3/dwc3-st.c | 25 +++++++++++--------------
1 file changed, 11 insertions(+), 14 deletions(-)
diff --git a/drivers/usb/dwc3/dwc3-st.c b/drivers/usb/dwc3/dwc3-st.c
index c8c7cd0c1796..98f43d7082d7 100644
--- a/drivers/usb/dwc3/dwc3-st.c
+++ b/drivers/usb/dwc3/dwc3-st.c
@@ -14,6 +14,7 @@
* Inspired by dwc3-omap.c and dwc3-exynos.c.
*/
+#include <linux/cleanup.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/io.h>
@@ -197,7 +198,7 @@ static int st_dwc3_probe(struct platform_device *pdev)
struct st_dwc3 *dwc3_data;
struct resource *res;
struct device *dev = &pdev->dev;
- struct device_node *node = dev->of_node, *child;
+ struct device_node *node = dev->of_node;
struct platform_device *child_pdev;
struct regmap *regmap;
int ret;
@@ -227,6 +228,13 @@ static int st_dwc3_probe(struct platform_device *pdev)
dev_vdbg(&pdev->dev, "glue-logic addr 0x%pK, syscfg-reg offset 0x%x\n",
dwc3_data->glue_base, dwc3_data->syscfg_reg_off);
+ struct device_node *child __free(device_node) = of_get_compatible_child(node,
+ "snps,dwc3");
+ if (!child) {
+ dev_err(&pdev->dev, "failed to find dwc3 core node\n");
+ return -ENODEV;
+ }
+
dwc3_data->rstc_pwrdn =
devm_reset_control_get_exclusive(dev, "powerdown");
if (IS_ERR(dwc3_data->rstc_pwrdn)) {
@@ -248,18 +256,11 @@ static int st_dwc3_probe(struct platform_device *pdev)
/* Manage SoftReset */
reset_control_deassert(dwc3_data->rstc_rst);
- child = of_get_compatible_child(node, "snps,dwc3");
- if (!child) {
- dev_err(&pdev->dev, "failed to find dwc3 core node\n");
- ret = -ENODEV;
- goto err_node_put;
- }
-
/* Allocate and initialize the core */
ret = of_platform_populate(node, NULL, NULL, dev);
if (ret) {
dev_err(dev, "failed to add dwc3 core\n");
- goto err_node_put;
+ goto undo_softreset;
}
child_pdev = of_find_device_by_node(child);
@@ -270,7 +271,6 @@ static int st_dwc3_probe(struct platform_device *pdev)
}
dwc3_data->dr_mode = usb_get_dr_mode(&child_pdev->dev);
- of_node_put(child);
platform_device_put(child_pdev);
/*
@@ -282,8 +282,7 @@ static int st_dwc3_probe(struct platform_device *pdev)
ret = st_dwc3_drd_init(dwc3_data);
if (ret) {
dev_err(dev, "drd initialisation failed\n");
- of_platform_depopulate(dev);
- goto undo_softreset;
+ goto depopulate;
}
/* ST glue logic init */
@@ -294,8 +293,6 @@ static int st_dwc3_probe(struct platform_device *pdev)
depopulate:
of_platform_depopulate(dev);
-err_node_put:
- of_node_put(child);
undo_softreset:
reset_control_assert(dwc3_data->rstc_rst);
undo_powerdown:
--
2.43.0
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