Re: k 2.6.9: ub module causes /dev/sda and /dev/sda1 not being created

[Adam Sampson <azz@us-lot.org>]

Pete Zaitcev <zaitcev@redhat.com> writes:

> This is intentional. The ub takes over certain functions of usb-storage
> when it is configured in. Is it a problem? If yes, why?

This happened to me too.

If you build both ub and usb_storage as modules and only load
usb_storage, then you can't use USB Storage devices any more:
usb_storage doesn't get attached to them (you end up with Driver=none
in /proc/bus/usb/devices). Since ub doesn't appear work with my
unbranded el-cheapo card reader, I wasn't able to use it until I
removed ub from my kernel config and rebuilt.

A friend's got a USB hard disk, and has the same problem with
usb_storage not getting used any more; I don't think he's tried ub
yet, but it's clearly the wrong thing to use for the job anyway.

This is how my card reader appears in /proc/bus/usb/devices with only
usb_storage built as a module:

T:  Bus=01 Lev=01 Prnt=01 Port=01 Cnt=02 Dev#= 35 Spd=12  MxCh= 0
D:  Ver= 1.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
P:  Vendor=0d7d ProdID=0240 Rev= 1.00
S:  Manufacturer=
S:  Product=USB Reader
S:  SerialNumber=FF0390500928
C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=100mA
I:  If#= 0 Alt= 0 #EPs= 3 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
E:  Ad=81(I) Atr=02(Bulk) MxPS=  64 Ivl=0ms
E:  Ad=02(O) Atr=02(Bulk) MxPS=  64 Ivl=0ms
E:  Ad=83(I) Atr=03(Int.) MxPS=   2 Ivl=1ms

And these are the errors that I got from ub when trying to mount a
card:

Wed Oct 27 19:54:27 2004 warning: ub: sizeof ub_scsi_cmd 60 ub_dev 924
Wed Oct 27 19:54:27 2004 info: uba: device 3 capacity nsec 50 bsize 512
Wed Oct 27 19:54:27 2004 warning: uba: made changed
Wed Oct 27 19:54:27 2004 info: uba: device 3 capacity nsec 50 bsize 512
Wed Oct 27 19:54:27 2004 info: uba: device 3 capacity nsec 50 bsize 512
Wed Oct 27 19:54:27 2004 info:  uba:end_request: I/O error, dev uba, sector 0
Wed Oct 27 19:54:27 2004 err: Buffer I/O error on device uba, logical block 0
Wed Oct 27 19:54:27 2004 warning: end_request: I/O error, dev uba, sector 2
Wed Oct 27 19:54:27 2004 err: Buffer I/O error on device uba, logical block 1
Wed Oct 27 19:54:27 2004 warning: end_request: I/O error, dev uba, sector 4
Wed Oct 27 19:54:27 2004 err: Buffer I/O error on device uba, logical block 2
Wed Oct 27 19:54:27 2004 warning: end_request: I/O error, dev uba, sector 6
Wed Oct 27 19:54:27 2004 err: Buffer I/O error on device uba, logical block 3
Wed Oct 27 19:54:27 2004 warning: end_request: I/O error, dev uba, sector 6
Wed Oct 27 19:54:27 2004 err: Buffer I/O error on device uba, logical block 3
Wed Oct 27 19:54:27 2004 warning: end_request: I/O error, dev uba, sector 4
Wed Oct 27 19:54:27 2004 err: Buffer I/O error on device uba, logical block 2
Wed Oct 27 19:54:27 2004 warning: end_request: I/O error, dev uba, sector 2
Wed Oct 27 19:54:27 2004 err: Buffer I/O error on device uba, logical block 1
Wed Oct 27 19:54:27 2004 warning: end_request: I/O error, dev uba, sector 0
Wed Oct 27 19:54:27 2004 err: Buffer I/O error on device uba, logical block 0
Wed Oct 27 19:54:27 2004 warning:  unable to read partition table
Wed Oct 27 19:54:27 2004 info:  uba:end_request: I/O error, dev uba, sector 2
Wed Oct 27 19:54:27 2004 err: Buffer I/O error on device uba, logical block 1
Wed Oct 27 19:54:27 2004 warning: end_request: I/O error, dev uba, sector 4
Wed Oct 27 19:54:27 2004 err: Buffer I/O error on device uba, logical block 2
Wed Oct 27 19:54:27 2004 warning: end_request: I/O error, dev uba, sector 6
Wed Oct 27 19:54:27 2004 err: Buffer I/O error on device uba, logical block 3
Wed Oct 27 19:54:27 2004 warning: end_request: I/O error, dev uba, sector 0
Wed Oct 27 19:54:27 2004 err: Buffer I/O error on device uba, logical block 0
Wed Oct 27 19:54:27 2004 warning:  unable to read partition table
Wed Oct 27 19:54:27 2004 info: usbcore: registered new driver ub
Wed Oct 27 19:55:27 2004 warning: uba: made changed
Wed Oct 27 19:55:27 2004 info: uba: device 3 capacity nsec 50 bsize 512
Wed Oct 27 19:55:27 2004 info: uba: device 3 capacity nsec 50 bsize 512
Wed Oct 27 19:55:27 2004 info:  uba:end_request: I/O error, dev uba, sector 2
Wed Oct 27 19:55:27 2004 err: Buffer I/O error on device uba, logical block 1
Wed Oct 27 19:55:27 2004 warning: end_request: I/O error, dev uba, sector 4
Wed Oct 27 19:55:27 2004 err: Buffer I/O error on device uba, logical block 2
Wed Oct 27 19:55:27 2004 warning: end_request: I/O error, dev uba, sector 6
Wed Oct 27 19:55:27 2004 err: Buffer I/O error on device uba, logical block 3
Wed Oct 27 19:55:27 2004 warning: end_request: I/O error, dev uba, sector 0
Wed Oct 27 19:55:27 2004 err: Buffer I/O error on device uba, logical block 0
Wed Oct 27 19:55:27 2004 warning: end_request: I/O error, dev uba, sector 2
Wed Oct 27 19:55:27 2004 err: Buffer I/O error on device uba, logical block 1
Wed Oct 27 19:55:27 2004 warning: end_request: I/O error, dev uba, sector 4
Wed Oct 27 19:55:27 2004 err: Buffer I/O error on device uba, logical block 2
(etc.; lots more "Buffer I/O error" lines)

-- 
Adam Sampson <azz@us-lot.org>                        <http://offog.org/>