linux-kernel - [PATCH 4/7] rtc : use class iteration api

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Message-ID: <20080112095330.GD2893@darkstar.te-china.tietoenator.com>
Date:	Sat, 12 Jan 2008 17:53:30 +0800
From:	Dave Young <hidave.darkstar@...il.com>
To:	a.zummo@...ertech.it
Cc:	gregkh@...e.de, linux-kernel@...r.kernel.org,
	rtc-linux@...glegroups.com
Subject: [PATCH 4/7] rtc : use class iteration api

Convert to use the class iteration api.

Signed-off-by: Dave Young <hidave.darkstar@...il.com> 

---
 drivers/rtc/interface.c |   22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff -upr linux/drivers/rtc/interface.c linux.new/drivers/rtc/interface.c
--- linux/drivers/rtc/interface.c	2008-01-11 18:06:38.000000000 +0800
+++ linux.new/drivers/rtc/interface.c	2008-01-11 18:06:38.000000000 +0800
@@ -251,20 +251,23 @@ void rtc_update_irq(struct rtc_device *r
 }
 EXPORT_SYMBOL_GPL(rtc_update_irq);
 
+static int __rtc_match(struct device *dev, void *data)
+{
+	char *name = (char *)data;
+
+	if (strncmp(dev->bus_id, name, BUS_ID_SIZE) == 0)
+		return 1;
+	return 0;
+}
+
 struct rtc_device *rtc_class_open(char *name)
 {
 	struct device *dev;
 	struct rtc_device *rtc = NULL;
 
-	down(&rtc_class->sem);
-	list_for_each_entry(dev, &rtc_class->devices, node) {
-		if (strncmp(dev->bus_id, name, BUS_ID_SIZE) == 0) {
-			dev = get_device(dev);
-			if (dev)
-				rtc = to_rtc_device(dev);
-			break;
-		}
-	}
+	dev = class_find_device(rtc_class, name, __rtc_match);
+	if (dev)
+		rtc = to_rtc_device(dev);
 
 	if (rtc) {
 		if (!try_module_get(rtc->owner)) {
@@ -272,7 +275,6 @@ struct rtc_device *rtc_class_open(char *
 			rtc = NULL;
 		}
 	}
-	up(&rtc_class->sem);
 
 	return rtc;
 }
--
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