linux-kernel - Re: SATA exceptions with 2.6.20-rc5

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Date:	Sun, 14 Jan 2007 17:43:53 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Björn Steinbrink <B.Steinbrink@....de>,
	jeff@...zik.org, linux-kernel@...r.kernel.org, htejun@...il.com
Subject: Re: SATA exceptions with 2.6.20-rc5

Björn Steinbrink wrote:
> Hi,
> 
> with 2.6.20-rc{2,4,5} (no other tested yet) I see SATA exceptions quite
> often, with 2.6.19 there are no such exceptions. dmesg and lspci -v
> output follows. In the meantime, I'll start bisecting.

...

> ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
> ata1.00: cmd e7/00:00:00:00:00/00:00:00:00:00/a0 tag 0 cdb 0x0 data 0 in
>          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
> ata1: soft resetting port
> ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
> ata1.00: configured for UDMA/133
> ata1: EH complete
> SCSI device sda: 160086528 512-byte hdwr sectors (81964 MB)
> sda: Write Protect is off
> sda: Mode Sense: 00 3a 00 00
> SCSI device sda: write cache: enabled, read cache: enabled, doesn't support DPO or FUA

Looks like all of these errors are from a FLUSH CACHE command and the 
drive is indicating that it is no longer busy, so presumably done. 
That's not a DMA-mapped command, so it wouldn't go through the ADMA 
machinery and I wouldn't have expected this to be handled any 
differently from before. Curious..

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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