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Commit 521b3d79 authored by Sebastian Ott's avatar Sebastian Ott Committed by Martin Schwidefsky
Browse files

s390/dcssblk: cleanup device attribute usage 



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: default avatarSebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 85e9d0e5

drivers/s390/block/dcssblk.c

+23 −29
Original line number Diff line number Diff line
@@ -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);

	}