linux-kernel - Re: [PATCH] PM: Add device name to suspend_report

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Date:   Wed, 2 Mar 2022 08:57:35 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Youngjin Jang <yj84.jang@...sung.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-acpi@...r.kernel.org, linux-usb@...r.kernel.org,
        js07.lee@...sung.com
Subject: Re: [PATCH] PM: Add device name to suspend_report_result()

On Wed, Mar 02, 2022 at 03:49:17PM +0900, Youngjin Jang wrote:
> From: "yj84.jang" <yj84.jang@...sung.com>
> 
> currently, suspend_report_result() prints only function information.
> If any driver uses common pm function, nobody knows who called
> failed function exactly.
> 
> So, device information is needed to recognize specific wrong driver.
> 
> e.g.)
> PM: dpm_run_callback(): pm_generic_suspend+0x0/0x48 returns 0
> PM: dpm_run_callback(): platform_pm_suspend+0x0/0x68 returns 0
> after patch,
> PM: dpm_run_callback(): pm_generic_suspend+0x0/0x48 (amba) returns 0
> PM: dpm_run_callback(): platform_pm_suspend+0x0/0x68 (armv7-pmu) returns 0
> 
> Signed-off-by: yj84.jang <yj84.jang@...sung.com>
> ---
>  drivers/base/power/main.c  | 10 +++++-----
>  drivers/pci/pci-driver.c   | 14 +++++++-------
>  drivers/pnp/driver.c       |  2 +-
>  drivers/usb/core/hcd-pci.c |  4 ++--
>  include/linux/pm.h         |  8 ++++----
>  5 files changed, 19 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
> index 04ea92c..a762fe8 100644
> --- a/drivers/base/power/main.c
> +++ b/drivers/base/power/main.c
> @@ -485,7 +485,7 @@ static int dpm_run_callback(pm_callback_t cb, struct device *dev,
>  	trace_device_pm_callback_start(dev, info, state.event);
>  	error = cb(dev);
>  	trace_device_pm_callback_end(dev, error);
> -	suspend_report_result(cb, error);
> +	suspend_report_result(dev, cb, error);
>  
>  	initcall_debug_report(dev, calltime, cb, error);
>  
> @@ -1568,7 +1568,7 @@ static int legacy_suspend(struct device *dev, pm_message_t state,
>  	trace_device_pm_callback_start(dev, info, state.event);
>  	error = cb(dev, state);
>  	trace_device_pm_callback_end(dev, error);
> -	suspend_report_result(cb, error);
> +	suspend_report_result(dev, cb, error);
>  
>  	initcall_debug_report(dev, calltime, cb, error);
>  
> @@ -1855,7 +1855,7 @@ static int device_prepare(struct device *dev, pm_message_t state)
>  	device_unlock(dev);
>  
>  	if (ret < 0) {
> -		suspend_report_result(callback, ret);
> +		suspend_report_result(dev, callback, ret);
>  		pm_runtime_put(dev);
>  		return ret;
>  	}
> @@ -1960,10 +1960,10 @@ int dpm_suspend_start(pm_message_t state)
>  }
>  EXPORT_SYMBOL_GPL(dpm_suspend_start);
>  
> -void __suspend_report_result(const char *function, void *fn, int ret)
> +void __suspend_report_result(const char *function, struct device *dev, void *fn, int ret)
>  {
>  	if (ret)
> -		pr_err("%s(): %pS returns %d\n", function, fn, ret);
> +		pr_err("%s(): %pS (%s) returns %d\n", function, fn, dev_driver_string(dev), ret);

If you have a struct device, please use dev_err().

thanks,

greg k-h