Re: [PATCH v4 5/6] driver core: Rename deferred_probe_timeout and make it global

[Rafael J. Wysocki]

On Thu, Feb 20, 2020 at 6:05 AM John Stultz <john.stultz@xxxxxxxxxx> 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.

Fair enough.

> Cc: Rob Herring <robh@xxxxxxxxxx>
> Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>
> Cc: Kevin Hilman <khilman@xxxxxxxxxx>
> Cc: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
> Cc: Pavel Machek <pavel@xxxxxx>
> Cc: Len Brown <len.brown@xxxxxxxxx>
> Cc: Todd Kjos <tkjos@xxxxxxxxxx>
> Cc: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
> Cc: Liam Girdwood <lgirdwood@xxxxxxxxx>
> Cc: Mark Brown <broonie@xxxxxxxxxx>
> Cc: Thierry Reding <treding@xxxxxxxxxx>
> Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Cc: linux-pm@xxxxxxxxxxxxxxx
> Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx>
> Change-Id: I92ee3b392004ecc9217c5337b54eda48c2d7f3ee

Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>

> ---
> 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
>