linux-kernel - Re: [PATCH V2 resend] libata:fix kernel panic when hotplug

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Message-ID: <20160621154700.GH3262@mtj.duckdns.org>
Date:	Tue, 21 Jun 2016 11:47:00 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	DingXiang <dingxiang@...wei.com>, jejb@...ux.vnet.ibm.com,
	Wei Fang <fangwei1@...wei.com>, miaoxie@...wei.com,
	wangyijing@...wei.com, zhangaihua1@...wei.com,
	zhaohongjiang@...wei.com, houtao1@...wei.com,
	linux-scsi <linux-scsi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 resend] libata:fix kernel panic when hotplug

Hello,

On Mon, Jun 20, 2016 at 06:46:55PM -0700, Dan Williams wrote:
> On Mon, Jun 20, 2016 at 6:22 PM, Martin K. Petersen
> <martin.petersen@...cle.com> wrote:
> >>>>>> "Tejun" == Tejun Heo <tj@...nel.org> writes:
> >
> >>> In fact,we don't need libata to deal with hotplug in sas environment.
> >>> So we can't run ata hotplug task when ata port is sas host.
> >
> > Tejun> Martin, can you please confirm whether the above is true.  If so,
> > Tejun> I'll route the patch through libata w/ stable cc'd.
> >
> > Not exactly a libsas expert. James? Dan?
> 
> While it is true that libsas itself handles adding / removing devices
> we have historically avoided this conflict because
> ATA_PFLAG_SCSI_HOTPLUG is never set for libsas ata_ports.  So the bug
> / behavior change is that  ATA_PFLAG_SCSI_HOTPLUG gets set in the
> first place.  Ignoring it is a band-aid / not the real fix afaics.

I see.  I'll hold off for now then.  Ding Xiang, can you find out
where that flag is getting set?

Thanks!

-- 
tejun