linux-kernel - Re: [patch 3/4] Enable link power management for ata drivers

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 1 Aug 2007 14:11:54 -0700
From:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
To:	Tejun Heo <htejun@...il.com>
Cc:	jeff@...zik.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	James.Bottomley@...eleye.com, edwintorok@...il.com,
	axboe@...nel.dk, linux-scsi@...r.kernel.org
Subject: Re: [patch 3/4] Enable link power management for ata drivers

On Wed, 01 Aug 2007 17:27:39 +0900
Tejun Heo <htejun@...il.com> wrote:

> Kristen Carlson Accardi wrote:
<snippy>
> Is it safe to use ALPM on a device which only claims to support DIPM?

Yes - I doubled checked this with the AHCI people - and of course you
have Edvin's testing to prove it does fine.

> I think this should be ATA_HORKAGE_IPM.

OK - I changed it.

> > @@ -321,6 +321,8 @@ struct ata_taskfile {
> >  	  ((u64) (id)[(n) + 0]) )
> >  
> >  #define ata_id_cdb_intr(id)	(((id)[0] & 0x60) == 0x20)
> > +#define ata_id_has_hipm(id)	((id)[76] & (1 << 9))
> > +#define ata_id_has_dipm(id)	((id)[78] & (1 << 3))
> 
> We probably need !0xffff test here.

Thanks, I fixed that too.

As far as moving the enable/disable_pm calls to EH - can you take
a look at the other patch I sent which implements the shost_attrs
to see if I still need to do this?  I really don't know much about
the EH stuff - can you explain why we need to use it to set the
link pm?

thanks for your review, 
Kristen
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/