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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.c36
1 files changed, 30 insertions, 6 deletions
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 1d3be80797f..13eeea3d547 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -108,6 +108,24 @@ css_subchannel_release(struct device *dev)
extern int css_get_ssd_info(struct subchannel *sch);
+
+int css_sch_device_register(struct subchannel *sch)
+{
+ int ret;
+
+ mutex_lock(&sch->reg_mutex);
+ ret = device_register(&sch->dev);
+ mutex_unlock(&sch->reg_mutex);
+ return ret;
+}
+
+void css_sch_device_unregister(struct subchannel *sch)
+{
+ mutex_lock(&sch->reg_mutex);
+ device_unregister(&sch->dev);
+ mutex_unlock(&sch->reg_mutex);
+}
+
static int
css_register_subchannel(struct subchannel *sch)
{
@@ -119,7 +137,7 @@ css_register_subchannel(struct subchannel *sch)
sch->dev.release = &css_subchannel_release;
/* make it known to the system */
- ret = device_register(&sch->dev);
+ ret = css_sch_device_register(sch);
if (ret)
printk (KERN_WARNING "%s: could not register %s\n",
__func__, sch->dev.bus_id);
@@ -250,7 +268,7 @@ css_evaluate_subchannel(struct subchannel_id schid, int slow)
* The device will be killed automatically.
*/
cio_disable_subchannel(sch);
- device_unregister(&sch->dev);
+ css_sch_device_unregister(sch);
/* Reset intparm to zeroes. */
sch->schib.pmcw.intparm = 0;
cio_modify(sch);
@@ -264,7 +282,7 @@ css_evaluate_subchannel(struct subchannel_id schid, int slow)
* away in any case.
*/
if (!disc) {
- device_unregister(&sch->dev);
+ css_sch_device_unregister(sch);
/* Reset intparm to zeroes. */
sch->schib.pmcw.intparm = 0;
cio_modify(sch);
@@ -605,9 +623,13 @@ init_channel_subsystem (void)
ret = device_register(&css[i]->device);
if (ret)
goto out_free;
- if (css_characteristics_avail && css_chsc_characteristics.secm)
- device_create_file(&css[i]->device,
- &dev_attr_cm_enable);
+ if (css_characteristics_avail &&
+ css_chsc_characteristics.secm) {
+ ret = device_create_file(&css[i]->device,
+ &dev_attr_cm_enable);
+ if (ret)
+ goto out_device;
+ }
}
css_init_done = 1;
@@ -615,6 +637,8 @@ init_channel_subsystem (void)
for_each_subchannel(__init_channel_subsystem, NULL);
return 0;
+out_device:
+ device_unregister(&css[i]->device);
out_free:
kfree(css[i]);
out_unregister: