diff options
Diffstat (limited to 'drivers/s390/crypto/ap_queue.c')
| -rw-r--r-- | drivers/s390/crypto/ap_queue.c | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/drivers/s390/crypto/ap_queue.c b/drivers/s390/crypto/ap_queue.c index f05ff54f4c4b..4fe443d30f9b 100644 --- a/drivers/s390/crypto/ap_queue.c +++ b/drivers/s390/crypto/ap_queue.c @@ -755,13 +755,30 @@ static ssize_t driver_override_store(struct device *dev, { struct ap_queue *aq = to_ap_queue(dev); struct ap_device *ap_dev = &aq->ap_dev; - int rc; + int rc = -EINVAL; + bool old_value; + + if (mutex_lock_interruptible(&ap_attr_mutex)) + return -ERESTARTSYS; + + /* Do not allow driver override if apmask/aqmask is in use */ + if (ap_apmask_aqmask_in_use) + goto out; + old_value = ap_dev->driver_override ? true : false; rc = driver_set_override(dev, &ap_dev->driver_override, buf, count); if (rc) - return rc; + goto out; + if (old_value && !ap_dev->driver_override) + --ap_driver_override_ctr; + else if (!old_value && ap_dev->driver_override) + ++ap_driver_override_ctr; - return count; + rc = count; + +out: + mutex_unlock(&ap_attr_mutex); + return rc; } static DEVICE_ATTR_RW(driver_override); |