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path: root/drivers/s390/cio/css.c
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Diffstat (limited to 'drivers/s390/cio/css.c')
-rw-r--r--drivers/s390/cio/css.c34
1 files changed, 14 insertions, 20 deletions
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 87bd70eeabed..555119cacc27 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -128,34 +128,28 @@ css_probe_device(int irq)
return ret;
}
+static int
+check_subchannel(struct device * dev, void * data)
+{
+ struct subchannel *sch;
+ int irq = (unsigned long)data;
+
+ sch = to_subchannel(dev);
+ return (sch->irq == irq);
+}
+
struct subchannel *
get_subchannel_by_schid(int irq)
{
- struct subchannel *sch;
- struct list_head *entry;
struct device *dev;
- if (!get_bus(&css_bus_type))
- return NULL;
- down_read(&css_bus_type.subsys.rwsem);
- sch = NULL;
- list_for_each(entry, &css_bus_type.devices.list) {
- dev = get_device(container_of(entry,
- struct device, bus_list));
- if (!dev)
- continue;
- sch = to_subchannel(dev);
- if (sch->irq == irq)
- break;
- put_device(dev);
- sch = NULL;
- }
- up_read(&css_bus_type.subsys.rwsem);
- put_bus(&css_bus_type);
+ dev = bus_find_device(&css_bus_type, NULL,
+ (void *)(unsigned long)irq, check_subchannel);
- return sch;
+ return dev ? to_subchannel(dev) : NULL;
}
+
static inline int
css_get_subchannel_status(struct subchannel *sch, int schid)
{