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s390/dcssblk: cleanup device attribute usage

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Let the driver core handle device attribute creation and removal. This
will simplify the code and eliminates races between attribute
availability and userspace notification via uevents.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2012-10-01 09:12:01 +02:00 committed by Martin Schwidefsky
parent 85e9d0e5ff
commit 521b3d790c
1 changed files with 23 additions and 29 deletions
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52
drivers/s390/block/dcssblk.c
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@ -69,23 +69,9 @@ static ssize_t dcssblk_add_store(struct device * dev, struct device_attribute *a
size_t count);
static ssize_t dcssblk_remove_store(struct device * dev, struct device_attribute *attr, const char * buf,
size_t count);
static ssize_t dcssblk_save_store(struct device * dev, struct device_attribute *attr, const char * buf,
size_t count);
static ssize_t dcssblk_save_show(struct device *dev, struct device_attribute *attr, char *buf);
static ssize_t dcssblk_shared_store(struct device * dev, struct device_attribute *attr, const char * buf,
size_t count);
static ssize_t dcssblk_shared_show(struct device *dev, struct device_attribute *attr, char *buf);
static ssize_t dcssblk_seglist_show(struct device *dev,
struct device_attribute *attr,
char *buf);
static DEVICE_ATTR(add, S_IWUSR, NULL, dcssblk_add_store);
static DEVICE_ATTR(remove, S_IWUSR, NULL, dcssblk_remove_store);
static DEVICE_ATTR(save, S_IWUSR | S_IRUSR, dcssblk_save_show,
dcssblk_save_store);
static DEVICE_ATTR(shared, S_IWUSR | S_IRUSR, dcssblk_shared_show,
dcssblk_shared_store);
static DEVICE_ATTR(seglist, S_IRUSR, dcssblk_seglist_show, NULL);
static struct device *dcssblk_root_dev;
@ -416,6 +402,8 @@ dcssblk_shared_store(struct device *dev, struct device_attribute *attr, const ch
up_write(&dcssblk_devices_sem);
return rc;
}
static DEVICE_ATTR(shared, S_IWUSR | S_IRUSR, dcssblk_shared_show,
dcssblk_shared_store);
/*
* device attribute for save operation on current copy
@ -476,6 +464,8 @@ dcssblk_save_store(struct device *dev, struct device_attribute *attr, const char
up_write(&dcssblk_devices_sem);
return count;
}
static DEVICE_ATTR(save, S_IWUSR | S_IRUSR, dcssblk_save_show,
dcssblk_save_store);
/*
* device attribute for showing all segments in a device
@ -502,6 +492,21 @@ dcssblk_seglist_show(struct device *dev, struct device_attribute *attr,
up_read(&dcssblk_devices_sem);
return i;
}
static DEVICE_ATTR(seglist, S_IRUSR, dcssblk_seglist_show, NULL);
static struct attribute *dcssblk_dev_attrs[] = {
&dev_attr_shared.attr,
&dev_attr_save.attr,
&dev_attr_seglist.attr,
NULL,
};
static struct attribute_group dcssblk_dev_attr_group = {
.attrs = dcssblk_dev_attrs,
};
static const struct attribute_group *dcssblk_dev_attr_groups[] = {
&dcssblk_dev_attr_group,
NULL,
};
/*
* device attribute for adding devices
@ -590,6 +595,7 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char
dev_set_name(&dev_info->dev, dev_info->segment_name);
dev_info->dev.release = dcssblk_release_segment;
dev_info->dev.groups = dcssblk_dev_attr_groups;
INIT_LIST_HEAD(&dev_info->lh);
dev_info->gd = alloc_disk(DCSSBLK_MINORS_PER_DISK);
if (dev_info->gd == NULL) {
@ -637,21 +643,10 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char
* register the device
*/
rc = device_register(&dev_info->dev);
if (rc) {
module_put(THIS_MODULE);
goto dev_list_del;
}
get_device(&dev_info->dev);
rc = device_create_file(&dev_info->dev, &dev_attr_shared);
if (rc)
goto unregister_dev;
rc = device_create_file(&dev_info->dev, &dev_attr_save);
if (rc)
goto unregister_dev;
rc = device_create_file(&dev_info->dev, &dev_attr_seglist);
if (rc)
goto unregister_dev;
goto put_dev;
get_device(&dev_info->dev);
add_disk(dev_info->gd);
switch (dev_info->segment_type) {
@ -668,12 +663,11 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char
rc = count;
goto out;
unregister_dev:
put_dev:
list_del(&dev_info->lh);
blk_cleanup_queue(dev_info->dcssblk_queue);
dev_info->gd->queue = NULL;
put_disk(dev_info->gd);
device_unregister(&dev_info->dev);
list_for_each_entry(seg_info, &dev_info->seg_list, lh) {
segment_unload(seg_info->segment_name);
}