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

[Tejun Heo]

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@xxxxxxxxxx> wrote:
> >>>>>> "Tejun" == Tejun Heo <tj@xxxxxxxxxx> 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