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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.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 3b45bbe6cce..c1afab5f72d 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -533,6 +533,12 @@ void css_schedule_eval_all(void)
spin_unlock_irqrestore(&slow_subchannel_lock, flags);
}
+void css_wait_for_slow_path(void)
+{
+ flush_workqueue(ccw_device_notify_work);
+ flush_workqueue(slow_path_wq);
+}
+
/* Reprobe subchannel if unregistered. */
static int reprobe_subchannel(struct subchannel_id schid, void *data)
{
@@ -683,10 +689,14 @@ css_cm_enable_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct channel_subsystem *css = to_css(dev);
+ int ret;
if (!css)
return 0;
- return sprintf(buf, "%x\n", css->cm_enabled);
+ mutex_lock(&css->mutex);
+ ret = sprintf(buf, "%x\n", css->cm_enabled);
+ mutex_unlock(&css->mutex);
+ return ret;
}
static ssize_t
@@ -696,6 +706,7 @@ css_cm_enable_store(struct device *dev, struct device_attribute *attr,
struct channel_subsystem *css = to_css(dev);
int ret;
+ mutex_lock(&css->mutex);
switch (buf[0]) {
case '0':
ret = css->cm_enabled ? chsc_secm(css, 0) : 0;
@@ -706,6 +717,7 @@ css_cm_enable_store(struct device *dev, struct device_attribute *attr,
default:
ret = -EINVAL;
}
+ mutex_unlock(&css->mutex);
return ret < 0 ? ret : count;
}
@@ -752,9 +764,11 @@ static int css_reboot_event(struct notifier_block *this,
struct channel_subsystem *css;
css = channel_subsystems[i];
+ mutex_lock(&css->mutex);
if (css->cm_enabled)
if (chsc_secm(css, 0))
ret = NOTIFY_BAD;
+ mutex_unlock(&css->mutex);
}
return ret;