[PATCH 1/2] block: genhd: add device_add_disk_with_groups

[Keith Busch]

On Thu, Sep 28, 2017 at 09:36:36PM +0200, Martin Wilck wrote:
> In the NVME subsystem, we're seeing a race condition with udev where
> device_add_disk() is called (which triggers an "add" uevent), and a
> sysfs attribute group is added to the disk device afterwards.
> If udev rules access these attributes before they are created,
> udev processing of the device is incomplete, in particular, device
> WWIDs may not be determined correctly.
> 
> To fix this, this patch introduces a new function
> device_add_disk_with_groups(), which takes a list of attribute groups
> and adds them to the device before sending out uevents.
> 
> Signed-off-by: Martin Wilck <mwilck at suse.com>

Is NVMe the only one having this problem? Was putting our attributes in
the disk's kobj a bad choice?

Any, looks fine to me.

Reviewed-by: Keith Busch <keith.busch at intel.com>