Re: 2.6.31-rc5 regression: hd don't show up

[Tejun Heo]

Tim Blechmann wrote:
>>> running 2.6.31-rc5 (7cb7beb31aa3d941833b6a6e553687422c31e4b6 to be
>>> exact), sometimes some hard disks don't show up.
>>>
>>> after booting, my root hd (sda) is mounted to /, while two other hds
>>> (sdb/sdc) are mounted as a user. sda is always present, but the other
>>> two sometimes don't show up (i.e. they are not listed in /dev/disk/, nor
>>> to they have a /dev/sdX link). with 2.6.29 and 2.6.30, all three disks
>>> are reported correctly.
>> Can you please attach boot logs of a successful and a failed boot?
> 
> i have two files attached:
> - dmesg_good - all hds are available
> - dmesg_bad - on hd is missing

Can you please apply the attached patch and post the bad boot log?

Thanks.

-- 
tejun
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 072ba5e..10af11d 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -6060,7 +6060,7 @@ static void async_port_probe(void *data, async_cookie_t cookie)
 
 		ehi->probe_mask |= ATA_ALL_DEVICES;
 		ehi->action |= ATA_EH_RESET | ATA_EH_LPM;
-		ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
+		ehi->flags |= ATA_EHI_NO_AUTOPSY/* | ATA_EHI_QUIET*/;
 
 		ap->pflags &= ~ATA_PFLAG_INITIALIZING;
 		ap->pflags |= ATA_PFLAG_LOADING;
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index bbbb1fa..c718d12 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -1998,6 +1998,9 @@ unsigned int ata_sff_dev_classify(struct ata_device *dev, int present,
 	if (r_err)
 		*r_err = err;
 
+	ata_dev_printk(dev, KERN_INFO, "XXX CLASSIFY TF %02x/%02x:%02x:%02x:%02x\n",
+		       tf.command, tf.feature, tf.lbal, tf.lbam, tf.lbah);
+
 	/* see if device passed diags: continue and warn later */
 	if (err == 0)
 		/* diagnostic fail : do nothing _YET_ */
@@ -2006,11 +2009,14 @@ unsigned int ata_sff_dev_classify(struct ata_device *dev, int present,
 		/* do nothing */ ;
 	else if ((dev->devno == 0) && (err == 0x81))
 		/* do nothing */ ;
-	else
+	else {
+		ata_dev_printk(dev, KERN_INFO, "XXX diag nodev\n");
 		return ATA_DEV_NONE;
+	}
 
 	/* determine if device is ATA or ATAPI */
 	class = ata_dev_classify(&tf);
+	ata_dev_printk(dev, KERN_INFO, "XXX ata_dev_classify=%d\n", class);
 
 	if (class == ATA_DEV_UNKNOWN) {
 		/* If the device failed diagnostic, it's likely to
@@ -2019,13 +2025,18 @@ unsigned int ata_sff_dev_classify(struct ata_device *dev, int present,
 		 * device signature is invalid with diagnostic
 		 * failure.
 		 */
-		if (present && (dev->horkage & ATA_HORKAGE_DIAGNOSTIC))
+		if (present && (dev->horkage & ATA_HORKAGE_DIAGNOSTIC)) {
+			ata_dev_printk(dev, KERN_INFO, "XXX UNK && present -> ATA\n");
 			class = ATA_DEV_ATA;
-		else
+		} else {
 			class = ATA_DEV_NONE;
+			ata_dev_printk(dev, KERN_INFO, "XXX UNK && !present -> NONE\n");
+		}
 	} else if ((class == ATA_DEV_ATA) &&
-		   (ap->ops->sff_check_status(ap) == 0))
+		   (ap->ops->sff_check_status(ap) == 0)) {
 		class = ATA_DEV_NONE;
+		ata_dev_printk(dev, KERN_INFO, "XXX stat==0 -> NONE\n");
+	}
 
 	return class;
 }