linux-kernel - Re: [PATCH v2 0/5] Re-order scsi_remove_host and sas_remove

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Message-ID: <20170421083938.GD26346@linux-x5ow.site>
Date:   Fri, 21 Apr 2017 10:39:38 +0200
From:   Johannes Thumshirn <jthumshirn@...e.de>
To:     John Garry <john.garry@...wei.com>
Cc:     "Martin K . Petersen" <martin.petersen@...cle.com>,
        James Bottomley <jejb@...ux.vnet.ibm.com>,
        Christoph Hellwig <hch@....de>, Hannes Reinecke <hare@...e.de>,
        Bart Van Assche <Bart.VanAssche@...disk.com>,
        Linux SCSI Mailinglist <linux-scsi@...r.kernel.org>,
        Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
        Jinpu Wang <jinpu.wang@...fitbricks.com>, tj@...nel.org,
        wangyijing@...wei.com, Heyousong <heyousong@...wei.com>,
        "chenqilin (C)" <chenqilin2@...wei.com>,
        Linuxarm <linuxarm@...wei.com>
Subject: Re: [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.

Thanks,
	Johannes

-- 
Johannes Thumshirn                                          Storage
jthumshirn@...e.de                                +49 911 74053 689
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