Bart Van Assche <bvanassche@xxxxxxx> 于2019年4月3日周三 上午1:10写道：
>
> On Tue, 2019-04-02 at 21:14 +0800, Weiping Zhang wrote:
> > [ ... ]
> > -static struct attribute *default_attrs[] = {
> > +static struct attribute *queue_attrs[] = {
> > &queue_requests_entry.attr,
> > &queue_ra_entry.attr,
> > &queue_max_hw_sectors_entry.attr,
> > @@ -770,6 +770,25 @@ static struct attribute *default_attrs[] = {
> > NULL,
> > };
> >
> > [ ... ]
> >
> > static ssize_t
> > @@ -890,7 +909,6 @@ static const struct sysfs_ops queue_sysfs_ops = {
> >
> > struct kobj_type blk_queue_ktype = {
> > .sysfs_ops = &queue_sysfs_ops,
> > - .default_attrs = default_attrs,
> > .release = blk_release_queue,
> > };
> >
> > @@ -939,6 +957,14 @@ int blk_register_queue(struct gendisk *disk)
> > goto unlock;
> > }
> >
> > + ret = sysfs_create_group(&q->kobj, &queue_attr_group);
> > + if (ret) {
> > + blk_trace_remove_sysfs(dev);
> > + kobject_del(&q->kobj);
> > + kobject_put(&dev->kobj);
> > + goto unlock;
> > + }
> > +
> > if (queue_is_mq(q)) {
> > __blk_mq_register_dev(dev, q);
> > blk_mq_debugfs_register(q);
>
> This kind of change introduces an unacceptable race against udev. I think we
> should wait with making this change until the patch series "kobject: Add
> default group support to kobj_type and replace subsystem uses" is upstream.
>
It's good patch, I'll send new patch after it was merged.
Could you point out the race case for udev?
> Bart.
