Re: [PATCH] PM: Add device name to suspend_report_result()

Greg Kroah-Hartman
2022-03-02T07:57:46Z

On Wed, Mar 02, 2022 at 03:49:17PM +0900, Youngjin Jang wrote:
> From: "yj84.jang" <yj84.jang@samsung.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@samsung.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