[PATCH 6/6] spi : use class iteration api
- From: Dave Young <hidave.darkstar@xxxxxxxxx>
- Date: Tue, 22 Jan 2008 14:03:31 +0800
Convert to use the class iteration api.
Signed-off-by: Dave Young <hidave.darkstar@xxxxxxxxx>
---
drivers/spi/spi.c | 24 ++++++++++++++----------
1 file changed, 14 insertions(+), 10 deletions(-)
diff -upr linux/drivers/spi/spi.c linux.new/drivers/spi/spi.c
--- linux/drivers/spi/spi.c 2008-01-16 08:43:35.000000000 +0800
+++ linux.new/drivers/spi/spi.c 2008-01-16 08:43:35.000000000 +0800
@@ -485,6 +485,15 @@ void spi_unregister_master(struct spi_ma
}
EXPORT_SYMBOL_GPL(spi_unregister_master);
+static int __spi_master_match(struct device *dev, void *data)
+{
+ struct spi_master *m;
+ u16 *bus_num = (u16 *)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(
{
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);
--
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