| Message ID | 1471418115-3654-9-git-send-email-famz@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi Fam,
[auto build test WARNING on linus/master]
[also build test WARNING on v4.8-rc2 next-20160817]
[cannot apply to linux/master]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Fam-Zheng/Fix-issue-with-KOBJ_ADD-uevent-versus-disk-attributes/20160817-152900
config: powerpc-allmodconfig (attached as .config)
compiler: powerpc64-linux-gnu-gcc (Debian 5.4.0-6) 5.4.0 20160609
reproduce:
wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=powerpc
All warnings (new ones prefixed by >>):
drivers/nvme/host/core.c: In function 'nvme_alloc_ns':
>> drivers/nvme/host/core.c:1689:42: warning: passing argument 3 of 'device_add_disk' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
device_add_disk(ctrl->device, ns->disk, &nvme_ns_attr_group);
^
In file included from include/linux/blkdev.h:9:0,
from drivers/nvme/host/core.c:15:
include/linux/genhd.h:416:12: note: expected 'struct attribute_group *' but argument is of type 'const struct attribute_group *'
extern int device_add_disk(struct device *parent, struct gendisk *disk,
^
vim +1689 drivers/nvme/host/core.c
1673 disk->private_data = ns;
1674 disk->queue = ns->queue;
1675 disk->flags = GENHD_FL_EXT_DEVT;
1676 sprintf(disk->disk_name, "nvme%dn%d", ctrl->instance, ns->instance);
1677
1678 if (nvme_revalidate_disk(ns->disk))
1679 goto out_free_disk;
1680
1681 mutex_lock(&ctrl->namespaces_mutex);
1682 list_add_tail(&ns->list, &ctrl->namespaces);
1683 mutex_unlock(&ctrl->namespaces_mutex);
1684
1685 kref_get(&ctrl->kref);
1686 if (ns->type == NVME_NS_LIGHTNVM)
1687 return;
1688
> 1689 device_add_disk(ctrl->device, ns->disk, &nvme_ns_attr_group);
1690 return;
1691 out_free_disk:
1692 kfree(disk);
1693 out_free_queue:
1694 blk_cleanup_queue(ns->queue);
1695 out_release_instance:
1696 ida_simple_remove(&ctrl->ns_ida, ns->instance);
1697 out_free_ns:
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 23a795f..1921cb2 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -1686,11 +1686,7 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid) if (ns->type == NVME_NS_LIGHTNVM) return; - device_add_disk(ctrl->device, ns->disk, NULL); - if (sysfs_create_group(&disk_to_dev(ns->disk)->kobj, - &nvme_ns_attr_group)) - pr_warn("%s: failed to create sysfs group for identification\n", - ns->disk->disk_name); + device_add_disk(ctrl->device, ns->disk, &nvme_ns_attr_group); return; out_free_disk: kfree(disk);
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. Signed-off-by: Fam Zheng <famz@redhat.com> --- drivers/nvme/host/core.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-)