linux-kernel - Re: DRDY errors again

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Date:	Tue, 08 Apr 2008 11:59:51 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	"J.A. Magallón" <jamagallon@....com>
CC:	"Linux-Kernel, " <linux-kernel@...r.kernel.org>,
	Linux IDE mailing list <linux-ide@...r.kernel.org>
Subject: Re: DRDY errors again

J.A. Magallón wrote:
> scsi4 : ata_piix
> scsi5 : ata_piix
> ata3: SATA max UDMA/133 cmd 0xc000 ctl 0xc400 bmdma 0xd000 irq 18
> ata4: SATA max UDMA/133 cmd 0xc800 ctl 0xcc00 bmdma 0xd008 irq 18

> ata4.00: ATA-8: ST3500820AS, SD25, max UDMA/133
> ata4.00: 976773168 sectors, multi 16: LBA48 NCQ (depth 0/32)
> ata4.00: configured for UDMA/133

> ata4.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
> ata4.00: cmd b0/d8:00:00:4f:c2/00:00:00:00:00/00 tag 0
>          res 40/00:01:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
> ata4.00: status: { DRDY }

Can you bisect to see when this problem starts?  I'm pretty sure it's 
software, either interrupt-related or the libata driver itself.

See http://ata.wiki.kernel.org/index.php/Libata_error_messages for a 
full explanation of that error message.

Most notable:  "DRDY" == device ready == device says everything is OK, 
from it's perspective.  "timeout" usually means an interrupt wasn't 
delivered from your ATA controller, when we were expecting one.

	Jeff


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