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authorSebastian Ott <sebott@linux.vnet.ibm.com>2012-10-01 09:12:01 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2012-10-09 14:16:56 +0200
commit521b3d790c16fad9d83c72d610c1e416ad3f7ae3 (patch)
tree978471e1dbd99661933903e0840c6d80a1ff9cc0 /drivers
parent85e9d0e5ffabfede5facbac5b0d9b90768bc6e90 (diff)
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: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/s390/block/dcssblk.c52
1 files changed, 23 insertions, 29 deletions
diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index a5a55da2a1a..b6ad0de0793 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -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 @@ out:
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);
}