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Bug 453808

Summary:	qc timeout probing TEAC DV-28E-V CD/DVD drive on SATA/PATA bridge
Product:	Red Hat Enterprise Linux 4	Reporter:	Bryn M. Reeves <bmr>
Component:	kernel	Assignee:	David Milburn <dmilburn>
Status:	CLOSED WONTFIX	QA Contact:	Martin Jenner <mjenner>
Severity:	high	Docs Contact:
Priority:	medium
Version:	4.8	CC:	dmilburn, jgarzik, jrfuller, riek, syeghiay, tao, vgoyal
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2009-08-17 20:30:33 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	461304

Description Bryn M. Reeves 2008-07-02 17:14:22 UTC

Description of problem:
At boot and when attempting to access the CD/DVD drive the following messages
are logged:

   ata3.00: qc timeout (cmd 0xa0)
   ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
   ata3.00: (BMDMA stat 0x25)
   ata3.00: cmd a0/01:00:00:00:00/00:00:00:00:00/a0 tag 0 cdb 0x43 data
   12 in res 51/20:03:00:00:00/00:00:00:00:00/a0 Emask 0x5 (timeout)
   ata3: port is slow to respond, please be patient (Status 0xd0)
   ata3: port failed to respond (30 secs, Status 0xd0)
   ata3: soft resetting port
   ata3.00: configured for UDMA/33
   ata3: EH complete

Drive identifies itself in /proc/scsi/scsi as:

   Host: scsi2 Channel: 00 Id: 00 Lun: 00
   Vendor: TEAC     Model: DV-28E-V         Rev: C.AB
   Type:   CD-ROM                           ANSI SCSI revision: 05


Version-Release number of selected component (if applicable):
2.6.9-67.EL, 2.6.9-67.0.4.EL

How reproducible:
100%

Steps to Reproduce:
1. Boot a system with the affected drive model attached to a SATA controller via
a PATA bridge
  
Actual results:
Above messages at boot time & as the system is running (presumably when
attempting to access the drive).

Expected results:
No messages at boot, drive works.

Additional info:
A similar problem was reported to the kernel.org bugzilla:

http://bugzilla.kernel.org/show_bug.cgi?id=10887

This involved the same drive model but attached directly to an IDE controller.
In that case the problem was avoided by increasing the retry count in
drivers/ide/ide-taskfile.c:wait_drive_not_busy() from 100 to 1000 (commit
f54feafa6d47d0aa1a96adefdc763b708b02f94f):

Author: Bartlomiej Zolnierkiewicz <bzolnier>
Date:   Fri Jun 20 20:53:33 2008 +0200

    ide: increase timeout in wait_drive_not_busy()
    
    Some ATAPI devices take longer than the current max timeout value to
    become ready (i.e. TEAC DV-W28ECW takes 6 ms) so increase the timeout
    value to 10 ms.
    
    This fixes kernel.org bugzilla bug #10887:
    http://bugzilla.kernel.org/show_bug.cgi?id=10887
    
    Reported-by: Masanari Iida <standby24x7>
    Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier>

Comment 2 Bryn M. Reeves 2008-07-21 12:18:59 UTC

Trying to get confirmation on whether increasing ata_probe_timeout actually
helped the problem. Have another report of this now - will ask the reporter to test.

Comment 6 RHEL Program Management 2008-09-03 13:08:44 UTC

Updating PM score.