Bug 122522

Summary:	USB 2.0 (ehci-hcd) support for MaPower Map-H31S external USB2.0 enclosure
Product:	[Fedora] Fedora	Reporter:	bit <bit_char_g>
Component:	kernel	Assignee:	Arjan van de Ven <arjanv>
Status:	CLOSED WORKSFORME	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	1
Target Milestone:	---
Target Release:	---
Hardware:	i386
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2004-05-05 23:54:30 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:

Description bit 2004-05-05 14:06:52 UTC

Description of problem:
When trying to use the external USB 2.0 enclosure Map-H31S from
MapPower several access and I/O problems occur, while the USB 1.1
support for this device works perfectly.

In-Depth Description:
When using the ehci-hcd module it is possible to mount the device
without any error message. But when trying to access any of the files
on the external USB drive it is not possible to do so.
Copying a file from the USB hd hangs after 32 to 128 kB (128 kB in
Nautilus, 32 kB in Konqueror)
kill -9 has no direct effect when trying to kill the hanging copy
process, but after a while (about 30 sec) the copy process terminates.
It is then possible to umount the device, but trying to mont it again,
results in an error message: no blockoriented device. Using '-o loop'
which shouldn't be necessary, results in another error message: no
device found.
Reboot solves the problem. The device is then mountable again.

Version-Release number of selected component (if applicable):
Kernel version 2.4.22-2188

How reproducible:
Always

Steps to Reproduce:
1. mount device with ehci-hcd module loaded
2. access file on device (for example copy a file)
3. stop hanging copy process and umount
4. remount not possible
  
Actual results:
Not possible to use USB 2.0 capability

Expected results:
Usage of USB 2.0 capability

Additional info:

Comment 1 bit 2004-05-05 15:17:23 UTC

The Chipset used in the enclosure is GeneSys
Bus 002 Device 002: ID 05e3:0702 Genesys Logic, Inc.

Comment 2 bit 2004-05-05 23:54:30 UTC

After editing /usr/src/linux-2.6.5-327/drivers/usb/storage/scsiglue.c
and changing
 /* limit the total size of a transfer to 120 KB */
     .max_sectors =                  240,

to:

/* limit the total size of a transfer to 64 KB */
.max_sectors =                  128,

and finally compiling the 2.6.5 custom kernel, resolves the issue.

Comment 3 Pete Zaitcev 2004-05-06 14:42:45 UTC

OK. FC2 is going to change that parameter automatically as it
detects GeneSys.