linux-kernel - [PATCH 2/8] hwmon: convert idr to ida and use ida

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Date:	Fri, 22 Jul 2011 17:41:11 +0100
From:	Jonathan Cameron <jic23@....ac.uk>
To:	linux-kernel@...r.kernel.org
Cc:	lm-sensors@...sensors.org, rtc-linux@...glegroups.com,
	osd-dev@...n-osd.org, linux-scsi@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, jkosina@...e.cz, naota@...sp.net,
	rusty@...tcorp.com.au, paulmck@...ux.vnet.ibm.com,
	namhyung@...il.com, randy.dunlap@...cle.com, tj@...nel.org,
	cabarnes@...esign-llc.com, akpm@...ux-foundation.org,
	airlied@...hat.com, thellstrom@...are.com, johnpol@....mipt.ru,
	JBottomley@...allels.com, bhalevy@...asas.com,
	bharrosh@...asas.com, a.zummo@...ertech.it,
	guenter.roeck@...csson.com, khali@...ux-fr.org, airlied@...ux.ie,
	Jonathan Cameron <jic23@....ac.uk>
Subject: [PATCH 2/8] hwmon: convert idr to ida and use ida_simple interface.

hwmon was using an idr with a NULL pointer, so convert to an
ida which then allows use of Rusty's ida_simple_get.

Signed-off-by: Jonathan Cameron <jic23@....ac.uk>
---
 drivers/hwmon/hwmon.c |   32 ++++++++------------------------
 1 files changed, 8 insertions(+), 24 deletions(-)

diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c
index a61e781..6460487 100644
--- a/drivers/hwmon/hwmon.c
+++ b/drivers/hwmon/hwmon.c
@@ -27,8 +27,7 @@
 
 static struct class *hwmon_class;
 
-static DEFINE_IDR(hwmon_idr);
-static DEFINE_SPINLOCK(idr_lock);
+static DEFINE_IDA(hwmon_ida);
 
 /**
  * hwmon_device_register - register w/ hwmon
@@ -42,30 +41,17 @@ static DEFINE_SPINLOCK(idr_lock);
 struct device *hwmon_device_register(struct device *dev)
 {
 	struct device *hwdev;
-	int id, err;
-
-again:
-	if (unlikely(idr_pre_get(&hwmon_idr, GFP_KERNEL) == 0))
-		return ERR_PTR(-ENOMEM);
-
-	spin_lock(&idr_lock);
-	err = idr_get_new(&hwmon_idr, NULL, &id);
-	spin_unlock(&idr_lock);
+	int id;
 
-	if (unlikely(err == -EAGAIN))
-		goto again;
-	else if (unlikely(err))
-		return ERR_PTR(err);
+	id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL);
+	if (id < 0)
+		return ERR_PTR(id);
 
-	id = id & MAX_ID_MASK;
 	hwdev = device_create(hwmon_class, dev, MKDEV(0, 0), NULL,
 			      HWMON_ID_FORMAT, id);
 
-	if (IS_ERR(hwdev)) {
-		spin_lock(&idr_lock);
-		idr_remove(&hwmon_idr, id);
-		spin_unlock(&idr_lock);
-	}
+	if (IS_ERR(hwdev))
+		ida_simple_remove(&hwmon_ida, id);
 
 	return hwdev;
 }
@@ -81,9 +67,7 @@ void hwmon_device_unregister(struct device *dev)
 
 	if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {
 		device_unregister(dev);
-		spin_lock(&idr_lock);
-		idr_remove(&hwmon_idr, id);
-		spin_unlock(&idr_lock);
+		ida_simple_remove(&hwmon_ida, id);
 	} else
 		dev_dbg(dev->parent,
 			"hwmon_device_unregister() failed: bad class ID!\n");
-- 
1.7.3.4

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