netdev - [PATCH v2 1/4] Revert "driver core: Delete driver_deferred_probe_check

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Message-Id: <20220819221616.2107893-2-saravanak@google.com>
Date:   Fri, 19 Aug 2022 15:16:11 -0700
From:   Saravana Kannan <saravanak@...gle.com>
To:     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>,
        Saravana Kannan <saravanak@...gle.com>
Cc:     Peng Fan <peng.fan@....com>, 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, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, iommu@...ts.linux.dev,
        netdev@...r.kernel.org
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://lore.kernel.org/lkml/20220601070707.3946847-1-saravanak@google.com/

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>
---
 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