linux-kernel - RE: [PATCH v2 1/4] Revert "driver core: Delete driver_deferred_probe_check

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Message-ID: <DU0PR04MB94175300872F36E5DF2826DF88709@DU0PR04MB9417.eurprd04.prod.outlook.com>
Date:   Tue, 23 Aug 2022 09:02:19 +0000
From:   Peng Fan <peng.fan@....com>
To:     Saravana Kannan <saravanak@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Kevin Hilman <khilman@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
CC:     Luca Weiss <luca.weiss@...rphone.com>,
        Doug Anderson <dianders@...omium.org>,
        Colin Foster <colin.foster@...advantage.com>,
        Tony Lindgren <tony@...mide.com>,
        Alexander Stein <alexander.stein@...tq-group.com>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Jean-Philippe Brucker <jpb@...nel.org>,
        "kernel-team@...roid.com" <kernel-team@...roid.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH v2 1/4] Revert "driver core: Delete
 driver_deferred_probe_check_state()"

> Subject: [PATCH v2 1/4] Revert "driver core: Delete
> driver_deferred_probe_check_state()"
> 
> This reverts commit 9cbffc7a59561be950ecc675d19a3d2b45202b2b.
> 
> There are a few more issues to fix that have been reported in the thread for
> the original series [1]. We'll need to fix those before this will work.
> So, revert it for now.
> 
> [1] -
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.
> kernel.org%2Flkml%2F20220601070707.3946847-1-
> saravanak%40google.com%2F&amp;data=05%7C01%7Cpeng.fan%40nxp.co
> m%7Ce9205a2ec9c049d2a68408da82307410%7C686ea1d3bc2b4c6fa92cd99
> c5c301635%7C0%7C0%7C637965441862478527%7CUnknown%7CTWFpbGZs
> b3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6M
> n0%3D%7C3000%7C%7C%7C&amp;sdata=tGjnNEQ6BwaNrxug9ceThYOlj0a3
> Gmds8qpwNcHf%2FH8%3D&amp;reserved=0
> 
> Fixes: 9cbffc7a5956 ("driver core: Delete
> driver_deferred_probe_check_state()")
> Reviewed-by: Tony Lindgren <tony@...mide.com>
> Tested-by: Tony Lindgren <tony@...mide.com>
> Signed-off-by: Saravana Kannan <saravanak@...gle.com>

Tested-by: Peng Fan <peng.fan@....com>
> ---
>  drivers/base/dd.c             | 30 ++++++++++++++++++++++++++++++
>  include/linux/device/driver.h |  1 +
>  2 files changed, 31 insertions(+)
> 
> diff --git a/drivers/base/dd.c b/drivers/base/dd.c index
> 70f79fc71539..a8916d1bfdcb 100644
> --- a/drivers/base/dd.c
> +++ b/drivers/base/dd.c
> @@ -274,12 +274,42 @@ static int __init
> deferred_probe_timeout_setup(char *str)  }
> __setup("deferred_probe_timeout=", deferred_probe_timeout_setup);
> 
> +/**
> + * driver_deferred_probe_check_state() - Check deferred probe state
> + * @dev: device to check
> + *
> + * Return:
> + * * -ENODEV if initcalls have completed and modules are disabled.
> + * * -ETIMEDOUT if the deferred probe timeout was set and has expired
> + *   and modules are enabled.
> + * * -EPROBE_DEFER in other cases.
> + *
> + * Drivers or subsystems can opt-in to calling this function instead of
> +directly
> + * returning -EPROBE_DEFER.
> + */
> +int driver_deferred_probe_check_state(struct device *dev) {
> +	if (!IS_ENABLED(CONFIG_MODULES) && initcalls_done) {
> +		dev_warn(dev, "ignoring dependency for device, assuming
> no driver\n");
> +		return -ENODEV;
> +	}
> +
> +	if (!driver_deferred_probe_timeout && initcalls_done) {
> +		dev_warn(dev, "deferred probe timeout, ignoring
> dependency\n");
> +		return -ETIMEDOUT;
> +	}
> +
> +	return -EPROBE_DEFER;
> +}
> +EXPORT_SYMBOL_GPL(driver_deferred_probe_check_state);
> +
>  static void deferred_probe_timeout_work_func(struct work_struct *work)
> {
>  	struct device_private *p;
> 
>  	fw_devlink_drivers_done();
> 
> +	driver_deferred_probe_timeout = 0;
>  	driver_deferred_probe_trigger();
>  	flush_work(&deferred_probe_work);
> 
> diff --git a/include/linux/device/driver.h b/include/linux/device/driver.h
> index 7acaabde5396..2114d65b862f 100644
> --- a/include/linux/device/driver.h
> +++ b/include/linux/device/driver.h
> @@ -242,6 +242,7 @@ driver_find_device_by_acpi_dev(struct
> device_driver *drv, const void *adev)
> 
>  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);
> 
>  /**
> --
> 2.37.1.595.g718a3a8f04-goog