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Date: Wed, 10 Apr 2019 05:09:17 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Michal Simek <michal.simek@...inx.com>,
Wim Van Sebroeck <wim@...ux-watchdog.org>
Cc: linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/23] watchdog: of_xilinx_wdt: Convert to use device
managed functions and other improvements
On 4/9/19 11:38 PM, Michal Simek wrote:
> On 09. 04. 19 19:23, Guenter Roeck wrote:
>> Use device managed functions to simplify error handling, reduce
>> source code size, improve readability, and reduce the likelyhood of bugs.
>> Other improvements as listed below.
>>
>> The conversion was done automatically with coccinelle using the
>> following semantic patches. The semantic patches and the scripts
>> used to generate this commit log are available at
>> https://github.com/groeck/coccinelle-patches
>>
>> - Drop assignments to otherwise unused variables
>> - Drop empty remove function
>> - Use devm_add_action_or_reset() for calls to clk_disable_unprepare
>> - Introduce local variable 'struct device *dev' and use it instead of
>> dereferencing it repeatedly
>> - Use devm_watchdog_register_driver() to register watchdog device
>>
>> Cc: Michal Simek <michal.simek@...inx.com>
>> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
>> ---
>> drivers/watchdog/of_xilinx_wdt.c | 58 ++++++++++++++++++----------------------
>> 1 file changed, 26 insertions(+), 32 deletions(-)
>>
>> diff --git a/drivers/watchdog/of_xilinx_wdt.c b/drivers/watchdog/of_xilinx_wdt.c
>> index 5c977164b3e5..03786992b701 100644
>> --- a/drivers/watchdog/of_xilinx_wdt.c
>> +++ b/drivers/watchdog/of_xilinx_wdt.c
>> @@ -151,41 +151,46 @@ static u32 xwdt_selftest(struct xwdt_device *xdev)
>> return XWT_TIMER_FAILED;
>> }
>>
>> +static void xwdt_clk_disable_unprepare(void *data)
>> +{
>> + clk_disable_unprepare(data);
>> +}
>> +
>> static int xwdt_probe(struct platform_device *pdev)
>> {
>> + struct device *dev = &pdev->dev;
>> int rc;
>> u32 pfreq = 0, enable_once = 0;
>> struct xwdt_device *xdev;
>> struct watchdog_device *xilinx_wdt_wdd;
>>
>> - xdev = devm_kzalloc(&pdev->dev, sizeof(*xdev), GFP_KERNEL);
>> + xdev = devm_kzalloc(dev, sizeof(*xdev), GFP_KERNEL);
>> if (!xdev)
>> return -ENOMEM;
>>
>> xilinx_wdt_wdd = &xdev->xilinx_wdt_wdd;
>> xilinx_wdt_wdd->info = &xilinx_wdt_ident;
>> xilinx_wdt_wdd->ops = &xilinx_wdt_ops;
>> - xilinx_wdt_wdd->parent = &pdev->dev;
>> + xilinx_wdt_wdd->parent = dev;
>>
>> xdev->base = devm_platform_ioremap_resource(pdev, 0);
>> if (IS_ERR(xdev->base))
>> return PTR_ERR(xdev->base);
>>
>> - rc = of_property_read_u32(pdev->dev.of_node, "xlnx,wdt-interval",
>> + rc = of_property_read_u32(dev->of_node, "xlnx,wdt-interval",
>> &xdev->wdt_interval);
>> if (rc)
>> - dev_warn(&pdev->dev,
>> - "Parameter \"xlnx,wdt-interval\" not found\n");
>> + dev_warn(dev, "Parameter \"xlnx,wdt-interval\" not found\n");
>>
>> - rc = of_property_read_u32(pdev->dev.of_node, "xlnx,wdt-enable-once",
>> + rc = of_property_read_u32(dev->of_node, "xlnx,wdt-enable-once",
>> &enable_once);
>> if (rc)
>> - dev_warn(&pdev->dev,
>> + dev_warn(dev,
>> "Parameter \"xlnx,wdt-enable-once\" not found\n");
>>
>> watchdog_set_nowayout(xilinx_wdt_wdd, enable_once);
>>
>> - xdev->clk = devm_clk_get(&pdev->dev, NULL);
>> + xdev->clk = devm_clk_get(dev, NULL);
>> if (IS_ERR(xdev->clk)) {
>> if (PTR_ERR(xdev->clk) != -ENOENT)
>> return PTR_ERR(xdev->clk);
>> @@ -196,10 +201,10 @@ static int xwdt_probe(struct platform_device *pdev)
>> */
>> xdev->clk = NULL;
>>
>> - rc = of_property_read_u32(pdev->dev.of_node, "clock-frequency",
>> + rc = of_property_read_u32(dev->of_node, "clock-frequency",
>> &pfreq);
>> if (rc)
>> - dev_warn(&pdev->dev,
>> + dev_warn(dev,
>> "The watchdog clock freq cannot be obtained\n");
>> } else {
>> pfreq = clk_get_rate(xdev->clk);
>> @@ -218,44 +223,34 @@ static int xwdt_probe(struct platform_device *pdev)
>>
>> rc = clk_prepare_enable(xdev->clk);
>> if (rc) {
>> - dev_err(&pdev->dev, "unable to enable clock\n");
>> + dev_err(dev, "unable to enable clock\n");
>> return rc;
>> }
>> + rc = devm_add_action_or_reset(dev, xwdt_clk_disable_unprepare,
>> + xdev->clk);
>> + if (rc)
>> + return rc;
>>
>> rc = xwdt_selftest(xdev);
>> if (rc == XWT_TIMER_FAILED) {
>> - dev_err(&pdev->dev, "SelfTest routine error\n");
>> - goto err_clk_disable;
>> + dev_err(dev, "SelfTest routine error\n");
>> + return rc;
>> }
>>
>> - rc = watchdog_register_device(xilinx_wdt_wdd);
>> + rc = devm_watchdog_register_device(dev, xilinx_wdt_wdd);
>> if (rc) {
>> - dev_err(&pdev->dev, "Cannot register watchdog (err=%d)\n", rc);
>> - goto err_clk_disable;
>> + dev_err(dev, "Cannot register watchdog (err=%d)\n", rc);
>> + return rc;
>> }
>>
>> clk_disable(xdev->clk);
>>
>> - dev_info(&pdev->dev, "Xilinx Watchdog Timer at %p with timeout %ds\n",
>> + dev_info(dev, "Xilinx Watchdog Timer at %p with timeout %ds\n",
>> xdev->base, xilinx_wdt_wdd->timeout);
>>
>> platform_set_drvdata(pdev, xdev);
>>
>> return 0;
>> -err_clk_disable:
>> - clk_disable_unprepare(xdev->clk);
>> -
>> - return rc;
>> -}
>> -
>> -static int xwdt_remove(struct platform_device *pdev)
>> -{
>> - struct xwdt_device *xdev = platform_get_drvdata(pdev);
>> -
>> - watchdog_unregister_device(&xdev->xilinx_wdt_wdd);
>> - clk_disable_unprepare(xdev->clk);
>> -
>> - return 0;
>> }
>>
>> /**
>> @@ -303,7 +298,6 @@ MODULE_DEVICE_TABLE(of, xwdt_of_match);
>>
>> static struct platform_driver xwdt_driver = {
>> .probe = xwdt_probe,
>> - .remove = xwdt_remove,
>> .driver = {
>> .name = WATCHDOG_NAME,
>> .of_match_table = xwdt_of_match,
>>
>
> Looks good to me. I would prefer to do it via 3 patches but I will let
> Wim to comment.
>
I could do that, but the total series is already more than 60 patches.
Splitting them up would mean hundreds of patches.
> Acked-by: Michal Simek <michal.simek@...inx.com>
>
Thanks,
Guenter
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