linux-kernel - [RFC PATCH 5/5] driver core: implement asynchorous probe() inside driver

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Date:	Sun,  9 Sep 2012 07:25:20 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Takashi Iwai <tiwai@...e.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linux-kernel@...r.kernel.org, Ming Lei <ming.lei@...onical.com>
Subject: [RFC PATCH 5/5] driver core: implement asynchorous probe() inside driver_register


Signed-off-by: Ming Lei <ming.lei@...onical.com>
---
 drivers/base/driver.c |   16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/base/driver.c b/drivers/base/driver.c
index 9365076..67fb63c 100644
--- a/drivers/base/driver.c
+++ b/drivers/base/driver.c
@@ -15,6 +15,7 @@
 #include <linux/errno.h>
 #include <linux/slab.h>
 #include <linux/string.h>
+#include <linux/async.h>
 #include "base.h"
 
 static struct device *next_device(struct klist_iter *i)
@@ -153,6 +154,13 @@ static void driver_remove_groups(struct device_driver *drv,
 			sysfs_remove_group(&drv->p->kobj, groups[i]);
 }
 
+static void async_driver_attach(void *data, async_cookie_t cookie)
+{
+	struct device_driver *drv = data;
+
+	driver_attach(drv);
+}
+
 /**
  * driver_register - register driver with bus
  * @drv: driver to register
@@ -193,8 +201,12 @@ int __driver_register(struct device_driver *drv, int sync)
 	kobject_uevent(&drv->p->kobj, KOBJ_ADD);
 
 	/* driver probe at the last minute */
-	if (drv->bus->p->drivers_autoprobe)
-		ret = driver_attach(drv);
+	if (drv->bus->p->drivers_autoprobe) {
+		if (sync)
+			ret = driver_attach(drv);
+		else
+			async_schedule(async_driver_attach, drv);
+	}
 
 	return ret;
 }
-- 
1.7.9.5

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