linux-kernel - Re: [PATCH v4 5/6] driver core: Rename deferred_probe

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Date:   Thu, 20 Feb 2020 08:00:43 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     John Stultz <john.stultz@...aro.org>
Cc:     lkml <linux-kernel@...r.kernel.org>, Rob Herring <robh@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
        Todd Kjos <tkjos@...gle.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Thierry Reding <treding@...dia.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH v4 5/6] driver core: Rename deferred_probe_timeout and
 make it global

On Wed 19 Feb 21:04 PST 2020, John Stultz wrote:

> Since other subsystems (like regulator) have similar arbitrary
> timeouts for how long they try to resolve driver dependencies,
> rename deferred_probe_timeout to driver_deferred_probe_timeout
> and set it as global, so it can be shared.
> 
> Cc: Rob Herring <robh@...nel.org>
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> Cc: Kevin Hilman <khilman@...nel.org>
> Cc: Ulf Hansson <ulf.hansson@...aro.org>
> Cc: Pavel Machek <pavel@....cz>
> Cc: Len Brown <len.brown@...el.com>
> Cc: Todd Kjos <tkjos@...gle.com>
> Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> Cc: Liam Girdwood <lgirdwood@...il.com>
> Cc: Mark Brown <broonie@...nel.org>
> Cc: Thierry Reding <treding@...dia.com>
> Cc: Linus Walleij <linus.walleij@...aro.org>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: linux-pm@...r.kernel.org
> Signed-off-by: John Stultz <john.stultz@...aro.org>
> Change-Id: I92ee3b392004ecc9217c5337b54eda48c2d7f3ee

Change-Id...

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> ---
> v4:
> * Split out into its own patch as suggested by Mark
> * Renamed deferred_probe_timeout as suggested by Greg
> ---
>  drivers/base/dd.c             | 18 ++++++++++--------
>  include/linux/device/driver.h |  1 +
>  2 files changed, 11 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/base/dd.c b/drivers/base/dd.c
> index 408e4da081da..39f1ce6d4f1c 100644
> --- a/drivers/base/dd.c
> +++ b/drivers/base/dd.c
> @@ -229,17 +229,19 @@ DEFINE_SHOW_ATTRIBUTE(deferred_devs);
>   * In the case of modules, set the default probe timeout to
>   * 30 seconds to give userland some time to load needed modules
>   */
> -static int deferred_probe_timeout = 30;
> +int driver_deferred_probe_timeout = 30;
>  #else
>  /* In the case of !modules, no probe timeout needed */
> -static int deferred_probe_timeout = -1;
> +int driver_deferred_probe_timeout = -1;
>  #endif
> +EXPORT_SYMBOL_GPL(driver_deferred_probe_timeout);
> +
>  static int __init deferred_probe_timeout_setup(char *str)
>  {
>  	int timeout;
>  
>  	if (!kstrtoint(str, 10, &timeout))
> -		deferred_probe_timeout = timeout;
> +		driver_deferred_probe_timeout = timeout;
>  	return 1;
>  }
>  __setup("deferred_probe_timeout=", deferred_probe_timeout_setup);
> @@ -259,10 +261,10 @@ __setup("deferred_probe_timeout=", deferred_probe_timeout_setup);
>   */
>  int driver_deferred_probe_check_state(struct device *dev)
>  {
> -	if (!initcalls_done || deferred_probe_timeout > 0)
> +	if (!initcalls_done || driver_deferred_probe_timeout > 0)
>  		return -EPROBE_DEFER;
>  
> -	if (!deferred_probe_timeout) {
> +	if (!driver_deferred_probe_timeout) {
>  		dev_WARN(dev, "deferred probe timeout, ignoring dependency");
>  		return -ETIMEDOUT;
>  	}
> @@ -276,7 +278,7 @@ static void deferred_probe_timeout_work_func(struct work_struct *work)
>  {
>  	struct device_private *private, *p;
>  
> -	deferred_probe_timeout = 0;
> +	driver_deferred_probe_timeout = 0;
>  	driver_deferred_probe_trigger();
>  	flush_work(&deferred_probe_work);
>  
> @@ -310,9 +312,9 @@ static int deferred_probe_initcall(void)
>  	driver_deferred_probe_trigger();
>  	flush_work(&deferred_probe_work);
>  
> -	if (deferred_probe_timeout > 0) {
> +	if (driver_deferred_probe_timeout > 0) {
>  		schedule_delayed_work(&deferred_probe_timeout_work,
> -			deferred_probe_timeout * HZ);
> +			driver_deferred_probe_timeout * HZ);
>  	}
>  	return 0;
>  }
> diff --git a/include/linux/device/driver.h b/include/linux/device/driver.h
> index 5242afabfaba..ee7ba5b5417e 100644
> --- a/include/linux/device/driver.h
> +++ b/include/linux/device/driver.h
> @@ -236,6 +236,7 @@ driver_find_device_by_acpi_dev(struct device_driver *drv, const void *adev)
>  }
>  #endif
>  
> +extern int driver_deferred_probe_timeout;
>  void driver_deferred_probe_add(struct device *dev);
>  int driver_deferred_probe_check_state(struct device *dev);
>  void driver_init(void);
> -- 
> 2.17.1
>