diff options
| -rw-r--r-- | drivers/s390/cio/cmf.c | 43 |
1 files changed, 23 insertions, 20 deletions
diff --git a/drivers/s390/cio/cmf.c b/drivers/s390/cio/cmf.c index 31677c075a8e..59b1ac24f992 100644 --- a/drivers/s390/cio/cmf.c +++ b/drivers/s390/cio/cmf.c @@ -821,42 +821,45 @@ static inline struct cmbe *cmbe_align(struct cmbe *c) static int alloc_cmbe(struct ccw_device *cdev) { - struct cmbe *cmbe; struct cmb_data *cmb_data; - int ret; + struct cmbe *cmbe; + int ret = -ENOMEM; cmbe = kzalloc (sizeof (*cmbe) * 2, GFP_KERNEL); if (!cmbe) - return -ENOMEM; + return ret; + cmb_data = kzalloc(sizeof(struct cmb_data), GFP_KERNEL); - if (!cmb_data) { - ret = -ENOMEM; + if (!cmb_data) goto out_free; - } + cmb_data->last_block = kzalloc(sizeof(struct cmbe), GFP_KERNEL); - if (!cmb_data->last_block) { - ret = -ENOMEM; + if (!cmb_data->last_block) goto out_free; - } + cmb_data->size = sizeof(struct cmbe); - spin_lock_irq(cdev->ccwlock); - if (cdev->private->cmb) { - spin_unlock_irq(cdev->ccwlock); - ret = -EBUSY; - goto out_free; - } cmb_data->hw_block = cmbe; + + spin_lock(&cmb_area.lock); + spin_lock_irq(cdev->ccwlock); + if (cdev->private->cmb) + goto out_unlock; + cdev->private->cmb = cmb_data; - spin_unlock_irq(cdev->ccwlock); /* activate global measurement if this is the first channel */ - spin_lock(&cmb_area.lock); if (list_empty(&cmb_area.list)) cmf_activate(NULL, 1); list_add_tail(&cdev->private->cmb_list, &cmb_area.list); - spin_unlock(&cmb_area.lock); + spin_unlock_irq(cdev->ccwlock); + spin_unlock(&cmb_area.lock); return 0; + +out_unlock: + spin_unlock_irq(cdev->ccwlock); + spin_unlock(&cmb_area.lock); + ret = -EBUSY; out_free: if (cmb_data) kfree(cmb_data->last_block); @@ -869,19 +872,19 @@ static void free_cmbe(struct ccw_device *cdev) { struct cmb_data *cmb_data; + spin_lock(&cmb_area.lock); spin_lock_irq(cdev->ccwlock); cmb_data = cdev->private->cmb; cdev->private->cmb = NULL; if (cmb_data) kfree(cmb_data->last_block); kfree(cmb_data); - spin_unlock_irq(cdev->ccwlock); /* deactivate global measurement if this is the last channel */ - spin_lock(&cmb_area.lock); list_del_init(&cdev->private->cmb_list); if (list_empty(&cmb_area.list)) cmf_activate(NULL, 0); + spin_unlock_irq(cdev->ccwlock); spin_unlock(&cmb_area.lock); } |