spi: use class iteration api

Convert to use the class iteration api.

Signed-off-by: Dave Young <hidave.darkstar@gmail.com>
Acked-by: David Brownell <david-b@pacbell.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 93e9de46977adc9b7bff784147c40f634fcf910b..682a6a48fec31e989dee472420cd37bc766c4b9f 100644 (file)
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -485,6 +485,15 @@ void spi_unregister_master(struct spi_master *master)
 }
 EXPORT_SYMBOL_GPL(spi_unregister_master);
 
+static int __spi_master_match(struct device *dev, void *data)
+{
+       struct spi_master *m;
+       u16 *bus_num = data;
+
+       m = container_of(dev, struct spi_master, dev);
+       return m->bus_num == *bus_num;
+}
+
 /**
  * spi_busnum_to_master - look up master associated with bus_num
  * @bus_num: the master's bus number
@@ -499,17 +508,12 @@ struct spi_master *spi_busnum_to_master(u16 bus_num)
 {
        struct device           *dev;
        struct spi_master       *master = NULL;
-       struct spi_master       *m;
-
-       down(&spi_master_class.sem);
-       list_for_each_entry(dev, &spi_master_class.children, node) {
-               m = container_of(dev, struct spi_master, dev);
-               if (m->bus_num == bus_num) {
-                       master = spi_master_get(m);
-                       break;
-               }
-       }
-       up(&spi_master_class.sem);
+
+       dev = class_find_device(&spi_master_class, &bus_num,
+                               __spi_master_match);
+       if (dev)
+               master = container_of(dev, struct spi_master, dev);
+       /* reference got in class_find_device */
        return master;
 }
 EXPORT_SYMBOL_GPL(spi_busnum_to_master);