Re: [PATCH] block: fix deadlock between sd_remove & sd_release

[Yu Kuai]

在 2024/07/18 0:23, Bart Van Assche 写道:
> On 7/17/24 3:15 AM, YangYang wrote:
> > These sysfs nodes are in different directories, the scsi node located
> > at /sys/bus/scsi/devices/0:0:0:0 and the gendisk node located at
> > /sys/block/sda. Would it be necessary to wait for the completion of
> > the scsi sysfs nodes' read/write operations before removing the
> > gendisk sysfs node?
>
> No. sysfs_remove_files() waits for pending read and write operations to
> complete.

So I check this and actually gendisk kobject is a child of scsi disk
kobject, not the other way. sda/device is just a symbol link.

sda/device -> ../../../14:2:0:0.

So, the sysfs api for gendisk itself doesn't issue IO, and as long as
related driver doesn't create new such api under gendisk, this won't
be a problem.

Thanks,
Kuai
> Bart.
>
> .