Bug 672720

Summary:	getting 'ctrl buffer too small' error on USB passthrough
Product:	Red Hat Enterprise Linux 6	Reporter:	Henry Maine <hmaine>
Component:	qemu-kvm	Assignee:	Alex Williamson <alex.williamson>
Status:	CLOSED ERRATA	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	6.0	CC:	ehabkost, lihuang, mkenneth, virt-maint
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	qemu-kvm-0.12.1.2-2.134.el6	Doc Type:	Bug Fix
Doc Text:	Cause: qemu-kvm buffer for USB control requests was too small for some devices (e.g. some USB cameras) when using USB passthrough. Consequence: some devices made qemu-kvm show a message like: "'husb: ctrl buffer too small (3273 > 2048)'" Fix: increased buffer for USB control requests from 2048 bytes to 8192 bytes. Consequence: some devices that didn't work using USB passthrough now work.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-05-19 11:20:55 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:	580954

Description Henry Maine 2011-01-26 01:14:55 UTC

Description of problem:

When trying to connect a USB camera to a Windows 7 VM running on RHEL6, Windows reports an error on the USB device and the following error shows up in the VM
log file:

'husb: ctrl buffer too small (3273 > 2048)'

This appears to be the exact same issue as BZ# 627343 which was fixed for RHEL5.
Any chance we can get the patch into RHEL6?

Version-Release number of selected component (if applicable):
qemu-kvm-0.12.1.2-2.113.el6_0.6.x86_64

How reproducible:

Always

Comment 6 Henry Maine 2011-02-15 00:17:49 UTC

Hi Li,

I tested the updated qemu-kvm package on the system we were working with earlier when we filed the bug and it seems to have fixed the problem.

Thanks,
Henry

Comment 8 Eduardo Habkost 2011-05-03 18:57:11 UTC

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
Cause: qemu-kvm buffer for USB control requests was too small for some devices (e.g. some USB cameras) when using USB passthrough.

Consequence: some devices made qemu-kvm show a message like: "'husb: ctrl buffer too small (3273 > 2048)'"

Fix: increased buffer for USB control requests from 2048 bytes to 8192 bytes.

Consequence: some devices that didn't work using USB passthrough now work.

Comment 9 errata-xmlrpc 2011-05-19 11:20:55 UTC

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2011-0534.html

Comment 10 errata-xmlrpc 2011-05-19 13:01:24 UTC

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2011-0534.html