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SubjectRe: [PATCH v2 0/5] Re-order scsi_remove_host and sas_remove_host in SAS HBA LLDDs
On Fri, Apr 21, 2017 at 09:34:18AM +0100, John Garry wrote:
> Thanks Johannes.
> @wangyijing, can you test this patchset please (specifically 3/5)? I know
> that you have the modified version of libsas which you dabbled with
> upstreaming.
> On 21/04/2017 09:04, 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.
> >
> wangyijing already sent an RFC for fixing this issue (mentioned above),
> which was a signifiagnt rewrite of some of libsas.
> I am hoping that he would retry, and that community would support/shepherd
> this activity, or at least say it will be accepted so effort is not wasted.

Do you have a link to the series? No problem if not, I'll probably can find it
in my archives. Anyways, if Wangyijing is re-sending his patches please Cc me
on it.


Johannes Thumshirn Storage +49 911 74053 689
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