1 files changed, 15 insertions, 11 deletions

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 93e9de46977a..682a6a48fec3 100644
--- 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);