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Re: [PATCH v2 0/5] Re-order scsi_remove_host and sas_remove_host in SAS HBA LLDDs

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On Fri, Apr 21, 2017 at 10:04:45AM +0200, Johannes Thumshirn wrote:
> This series re-orders the calls to scsi_remove_host() and sas_remove_host() in
> all SAS HBA drivers (apart from mpt3sas which is doing it correctly). This is
> for two reasons:
> 	1) After the change to recursive removal of sysfs entries, we're
> 	   trying to remove already removed kobjects when doing a
> 	   sas_remove_host() _after_ a scsi_remove_host()
> 	2) the documentation mandates it even (becuase of 1)
> 
> Unfortunately this does not completely solve issues with recursive sysfs
> removals in SAS, as libsas has asynchronous behaviour where strong ordering
> would be needed. But I am working on it and I do know other do as well. So if
> anyone else (James, Christoph, Bart, I'm looking at you) has an idea, I do
> have test setups and I'm willing to take input in form of ideas and patches.
> 
> I also dropped the SDEV_CANCEL state change for now. We re-evaluate it once we
> have an idea how to tackle the ordering issues and place it into
> sas_unregister_ha() as per James' comment.

Any reason to not just make sas_remove_host call scsi_remove_host
to ensure we get the ordering right?

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[PATCH v2 0/5] Re-order scsi_remove_host and sas_remove_host in SAS HBA LLDDs Johannes Thumshirn <jthumshirn@suse.de> - 2017-04-21 10:10 +0200
  [PATCH v2 5/5] scsi: pm8001: remove the SAS host after the SCSI host Johannes Thumshirn <jthumshirn@suse.de> - 2017-04-21 10:10 +0200
  Re: [PATCH v2 0/5] Re-order scsi_remove_host and sas_remove_host in  SAS HBA LLDDs Johannes Thumshirn <jthumshirn@suse.de> - 2017-04-21 10:40 +0200
    Re: [PATCH v2 0/5] Re-order scsi_remove_host and sas_remove_host in  SAS HBA LLDDs John Garry <john.garry@huawei.com> - 2017-04-21 11:00 +0200
      Re: [PATCH v2 0/5] Re-order scsi_remove_host and sas_remove_host         in SAS HBA LLDDs Christoph Hellwig <hch@lst.de> - 2017-04-21 13:30 +0200
        Re: [PATCH v2 0/5] Re-order scsi_remove_host and sas_remove_host in  SAS HBA LLDDs John Garry <john.garry@huawei.com> - 2017-04-21 14:00 +0200
          Re: [PATCH v2 0/5] Re-order scsi_remove_host and sas_remove_host in  SAS HBA LLDDs wangyijing <wangyijing@huawei.com> - 2017-04-22 02:50 +0200
  Re: [PATCH v2 0/5] Re-order scsi_remove_host and sas_remove_host in  SAS HBA LLDDs John Garry <john.garry@huawei.com> - 2017-04-21 10:40 +0200
  Re: [PATCH v2 0/5] Re-order scsi_remove_host and sas_remove_host in  SAS HBA LLDDs Johannes Thumshirn <jthumshirn@suse.de> - 2017-04-21 13:30 +0200
  Re: [PATCH v2 0/5] Re-order scsi_remove_host and sas_remove_host         in SAS HBA LLDDs Christoph Hellwig <hch@lst.de> - 2017-04-21 13:30 +0200

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