drivers/rtc/class.c: convert idr to ida and use ida_simple_get()

This is the one use of an ida that doesn't retry on receiving -EAGAIN.
I'm assuming do so will cause no harm and may help on a rare occasion.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c
index 01a7df5..e8326f2 100644 (file)
--- a/drivers/rtc/class.c
+++ b/drivers/rtc/class.c
@@ -21,16 +21,13 @@
 #include "rtc-core.h"
 
 
-static DEFINE_IDR(rtc_idr);
-static DEFINE_MUTEX(idr_lock);
+static DEFINE_IDA(rtc_ida);
 struct class *rtc_class;
 
 static void rtc_device_release(struct device *dev)
 {
        struct rtc_device *rtc = to_rtc_device(dev);
-       mutex_lock(&idr_lock);
-       idr_remove(&rtc_idr, rtc->id);
-       mutex_unlock(&idr_lock);
+       ida_simple_remove(&rtc_ida, rtc->id);
        kfree(rtc);
 }
 
@@ -146,25 +143,16 @@ struct rtc_device *rtc_device_register(const char *name, struct device *dev,
        struct rtc_wkalrm alrm;
        int id, err;
 
-       if (idr_pre_get(&rtc_idr, GFP_KERNEL) == 0) {
-               err = -ENOMEM;
+       id = ida_simple_get(&rtc_ida, 0, 0, GFP_KERNEL);
+       if (id < 0) {
+               err = id;
                goto exit;
        }
 
-
-       mutex_lock(&idr_lock);
-       err = idr_get_new(&rtc_idr, NULL, &id);
-       mutex_unlock(&idr_lock);
-
-       if (err < 0)
-               goto exit;
-
-       id = id & MAX_ID_MASK;
-
        rtc = kzalloc(sizeof(struct rtc_device), GFP_KERNEL);
        if (rtc == NULL) {
                err = -ENOMEM;
-               goto exit_idr;
+               goto exit_ida;
        }
 
        rtc->id = id;
@@ -222,10 +210,8 @@ struct rtc_device *rtc_device_register(const char *name, struct device *dev,
 exit_kfree:
        kfree(rtc);
 
-exit_idr:
-       mutex_lock(&idr_lock);
-       idr_remove(&rtc_idr, id);
-       mutex_unlock(&idr_lock);
+exit_ida:
+       ida_simple_remove(&rtc_ida, id);
 
 exit:
        dev_err(dev, "rtc core: unable to register %s, err = %d\n",
@@ -276,7 +262,7 @@ static void __exit rtc_exit(void)
 {
        rtc_dev_exit();
        class_destroy(rtc_class);
-       idr_destroy(&rtc_idr);
+       ida_destroy(&rtc_ida);
 }
 
 subsys_initcall(rtc_init);