linux-kernel - Re: Suspend to ram regression (2.6.24-rc1-git)

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Message-Id: <20071102163708.15304989.kristen.c.accardi@intel.com>
Date:	Fri, 2 Nov 2007 16:37:08 -0700
From:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	linux-kernel@...r.kernel.org, jeff@...zik.org,
	linux-ide@...r.kernel.org
Subject: Re: Suspend to ram regression (2.6.24-rc1-git)

On Thu, 1 Nov 2007 09:41:46 +0100
Jens Axboe <jens.axboe@...cle.com> wrote:

> On Wed, Oct 31 2007, Jens Axboe wrote:
> > Hi,
> > 
> > My x60 stopped suspending about two days ago. It just freezes after
> > printing
> > 
> > Suspending console(s)
> > 
> > where it would normally turn everything off and the 'moon' light would
> > go on. Posting this message in case somebody else knows what is up, if
> > not I'll do a bisect on it tomorrow.
> 
> Did the bisect, it points to this commit:
> 
> 1556594f913fa81d008cecfe46d7211c919a853 is first bad commit
> commit 31556594f913fa81d008cecfe46d7211c919a853
> Author: Kristen Carlson Accardi <kristen.c.accardi@...el.com>
> Date:   Thu Oct 25 01:33:26 2007 -0400
> 
>     [libata] AHCI: add hw link power management support
> 
> Booting any kernel after this commit fails suspending to ram, it just
> sits there forever.
> 
> -- 
> Jens Axboe
> 

Does this patch fix your problem?  It seems to get hung up while disabling
DIPM, and after thinking about this a bit, I don't think we really need
to do this anyway.


Don't disable dipm with SET FEATURES

Signed-off-by:  Kristen Carlson Accardi <kristen.c.accardi@...el.com>

---
 drivers/ata/libata-core.c |   18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

Index: 2.6-git/drivers/ata/libata-core.c
===================================================================
--- 2.6-git.orig/drivers/ata/libata-core.c	2007-11-01 09:59:17.000000000 -0700
+++ 2.6-git/drivers/ata/libata-core.c	2007-11-02 16:35:13.000000000 -0700
@@ -676,10 +676,11 @@ static int ata_dev_set_dipm(struct ata_d
 		if (rc)
 			return rc;
 
-		/* disable DIPM */
-		if (ata_dev_enabled(dev) && (dev->flags & ATA_DFLAG_DIPM))
-			err_mask = ata_dev_set_feature(dev,
-					SETFEATURES_SATA_DISABLE, SATA_DIPM);
+		/*
+		 * we don't have to disable DIPM since IPM flags
+		 * disallow transitions to SLUMBER, which effectively
+		 * disable DIPM if it does not support PARTIAL
+		 */
 		break;
 	case NOT_AVAILABLE:
 	case MAX_PERFORMANCE:
@@ -689,10 +690,11 @@ static int ata_dev_set_dipm(struct ata_d
 		if (rc)
 			return rc;
 
-		/* disable DIPM */
-		if (ata_dev_enabled(dev) && (dev->flags & ATA_DFLAG_DIPM))
-			err_mask = ata_dev_set_feature(dev,
-					SETFEATURES_SATA_DISABLE, SATA_DIPM);
+		/*
+		 * we don't have to disable DIPM since IPM flags
+		 * disallow all transitions which effectively
+		 * disable DIPM anyway.
+		 */
 		break;
 	}
 
-
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