s390/css: move subchannel lock allocation
cio_validate_subchannel is used to do some basic checks to find out
if it's worth to further investigate a subchannel. Move the allocation
and initialization of the subchannels locks to css_alloc_subchannel.
Clean up the functions involved while at it.
Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 054fb42..1ebe5d3 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -137,6 +137,18 @@
static void css_sch_todo(struct work_struct *work);
+static int css_sch_create_locks(struct subchannel *sch)
+{
+ sch->lock = kmalloc(sizeof(*sch->lock), GFP_KERNEL);
+ if (!sch->lock)
+ return -ENOMEM;
+
+ spin_lock_init(sch->lock);
+ mutex_init(&sch->reg_mutex);
+
+ return 0;
+}
+
static void css_subchannel_release(struct device *dev)
{
struct subchannel *sch = to_subchannel(dev);
@@ -152,18 +164,26 @@
struct subchannel *sch;
int ret;
- sch = kmalloc (sizeof (*sch), GFP_KERNEL | GFP_DMA);
- if (sch == NULL)
+ sch = kzalloc(sizeof(*sch), GFP_KERNEL | GFP_DMA);
+ if (!sch)
return ERR_PTR(-ENOMEM);
- ret = cio_validate_subchannel (sch, schid);
- if (ret < 0) {
- kfree(sch);
- return ERR_PTR(ret);
- }
+
+ ret = cio_validate_subchannel(sch, schid);
+ if (ret < 0)
+ goto err;
+
+ ret = css_sch_create_locks(sch);
+ if (ret)
+ goto err;
+
INIT_WORK(&sch->todo_work, css_sch_todo);
sch->dev.release = &css_subchannel_release;
device_initialize(&sch->dev);
return sch;
+
+err:
+ kfree(sch);
+ return ERR_PTR(ret);
}
static int css_sch_device_register(struct subchannel *sch)
@@ -756,7 +776,7 @@
css->pseudo_subchannel->dev.release = css_subchannel_release;
dev_set_name(&css->pseudo_subchannel->dev, "defunct");
mutex_init(&css->pseudo_subchannel->reg_mutex);
- ret = cio_create_sch_lock(css->pseudo_subchannel);
+ ret = css_sch_create_locks(css->pseudo_subchannel);
if (ret) {
kfree(css->pseudo_subchannel);
return ret;