[PATCH 12/15] mtip: Pass attribute group to device_add_disk

Fam Zheng
2016-08-17T07:15:12Z

Previously after device_add_disk returns, the KOBJ_ADD uevent is already
emitted. Adding attributes after that is a poor usage of kobject, and
in practice may result in race conditions with userspace, for
example udev checks availability of certain attributes and initializes
/dev entries conditionally.

device_add_disk can handle adding attribute group better, so use it.
Meanwhile, update the error check code and message.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
drivers/block/mtip32xx/mtip32xx.c | 38 ++++++++------------------------------
1 file changed, 8 insertions(+), 30 deletions(-)

diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index 4048a70..504c549 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -2702,26 +2702,14 @@ static const struct file_operations mtip_flags_fops = {
.llseek = no_llseek,
};

-/*
- * Create the sysfs related attributes.
- *
- * @dd Pointer to the driver data structure.
- * @kobj Pointer to the kobj for the block device.
- *
- * return value
- * 0 Operation completed successfully.
- * -EINVAL Invalid parameter.
- */
-static int mtip_hw_sysfs_init(struct driver_data *dd, struct kobject *kobj)
-{
- if (!kobj || !dd)
- return -EINVAL;
+static struct attribute *mtip_dev_attrs[] = {
+ &dev_attr_status.attr,
+ NULL
+};

- if (sysfs_create_file(kobj, &dev_attr_status.attr))
- dev_warn(&dd->pdev->dev,
- "Error creating 'status' sysfs entry\n");
- return 0;
-}
+static struct attribute_group mtip_attr_group = {
+ .attrs = mtip_dev_attrs,
+};

/*
* Remove the sysfs related attributes.
@@ -3918,7 +3906,6 @@ static int mtip_block_initialize(struct driver_data *dd)
int rv = 0, wait_for_rebuild = 0;
sector_t capacity;
unsigned int index = 0;
- struct kobject *kobj;

if (dd->disk)
goto skip_create_disk; /* hw init done, before rebuild */
@@ -4041,18 +4028,9 @@ skip_create_disk:
set_capacity(dd->disk, capacity);

/* Enable the block device and add it to /dev */
- device_add_disk(&dd->pdev->dev, dd->disk, NULL);
+ device_add_disk(&dd->pdev->dev, dd->disk, &mtip_attr_group);

dd->bdev = bdget_disk(dd->disk, 0);
- /*
- * Now that the disk is active, initialize any sysfs attributes
- * managed by the protocol layer.
- */
- kobj = kobject_get(&disk_to_dev(dd->disk)->kobj);
- if (kobj) {
- mtip_hw_sysfs_init(dd, kobj);
- kobject_put(kobj);
- }

if (dd->mtip_svc_handler) {
set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
--
2.7.4