diff options
Diffstat (limited to 'drivers/s390/cio/css.c')
| -rw-r--r-- | drivers/s390/cio/css.c | 26 |
1 files changed, 22 insertions, 4 deletions
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c index 3b45bbe6cce0..595e327d2f76 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 @@ -695,17 +705,23 @@ css_cm_enable_store(struct device *dev, struct device_attribute *attr, { struct channel_subsystem *css = to_css(dev); int ret; + unsigned long val; - switch (buf[0]) { - case '0': + ret = strict_strtoul(buf, 16, &val); + if (ret) + return ret; + mutex_lock(&css->mutex); + switch (val) { + case 0: ret = css->cm_enabled ? chsc_secm(css, 0) : 0; break; - case '1': + case 1: ret = css->cm_enabled ? 0 : chsc_secm(css, 1); break; default: ret = -EINVAL; } + mutex_unlock(&css->mutex); return ret < 0 ? ret : count; } @@ -752,9 +768,11 @@ 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; |