Re: Test patch for ub and double registration

[Fabio Coatti <cova@ferrara.linux.it>]

Alle 01:44, martedì 02 novembre 2004, Pete Zaitcev ha scritto:
> Hello,
>
> here's a patch to fix the double kobject registration problem with the ub.
> One little problem here is that I do not have a device which fails this
> way, so I would like owners of such devices to give it a try.
>
> The latest victim of this is Fabio Coatti. It should be noted that this
> fix only (supposed to) prevents oopses on deregistration. If the device
> doesn't work generally (for example, requires START STOP UNIT), it won't
> help that.

I've tried (under 2.6.10-rc1-mm1, that was the kernel that showed me problems) 
and in fact I can plug/unplug without problems usb flash drive, but there is 
a difference with previous behaviour (apart from crash, of course :) )
here the log from patched version of ub.c:

=================================================
Nov  2 22:44:20 kefk kernel: ehci_hcd 0000:00:1d.7: GetStatus port 3 status 
001803 POWER sig=j  CSC CONNECT
Nov  2 22:44:20 kefk kernel: hub 5-0:1.0: port 3, status 0501, change 0001, 
480 Mb/s
Nov  2 22:44:21 kefk kernel: hub 5-0:1.0: debounce: port 3: total 100ms stable 
100ms status 0x501
Nov  2 22:44:21 kefk kernel: ehci_hcd 0000:00:1d.7: port 3 high speed
Nov  2 22:44:21 kefk kernel: ehci_hcd 0000:00:1d.7: GetStatus port 3 status 
001005 POWER sig=se0  PE CONNECT
Nov  2 22:44:21 kefk kernel: usb 5-3: new high speed USB device using ehci_hcd 
and address 6
Nov  2 22:44:21 kefk kernel: ehci_hcd 0000:00:1d.7: port 3 high speed
Nov  2 22:44:21 kefk kernel: ehci_hcd 0000:00:1d.7: GetStatus port 3 status 
001005 POWER sig=se0  PE CONNECT
Nov  2 22:44:21 kefk kernel: usb 5-3: ep0 maxpacket = 64
Nov  2 22:44:21 kefk kernel: usb 5-3: new device strings: Mfr=1, Product=2, 
SerialNumber=3
Nov  2 22:44:21 kefk kernel: usb 5-3: default language 0x0409
Nov  2 22:44:21 kefk kernel: usb 5-3: Product: Mass storage
Nov  2 22:44:21 kefk kernel: usb 5-3: Manufacturer: USB
Nov  2 22:44:21 kefk kernel: usb 5-3: SerialNumber: 142E19413C2FCA34
Nov  2 22:44:21 kefk kernel: usb 5-3: hotplug
Nov  2 22:44:21 kefk kernel: usb 5-3: adding 5-3:1.0 (config #1, interface 0)
Nov  2 22:44:21 kefk kernel: usb 5-3:1.0: hotplug
Nov  2 22:44:21 kefk kernel: ub 5-3:1.0: usb_probe_interface
Nov  2 22:44:21 kefk kernel: ub 5-3:1.0: usb_probe_interface - got id
Nov  2 22:44:21 kefk kernel: uba: device 6 capacity nsec 50 bsize 512
(nothing more)
=================================================

but at this point no device is created in /dev, while previous behaviour was 
different:
(snip)
Oct 28 00:32:22 kefk kernel: ub 5-3:1.0: usb_probe_interface
Oct 28 00:32:22 kefk kernel: ub 5-3:1.0: usb_probe_interface - got id
Oct 28 00:32:22 kefk kernel: uba: device 4 capacity nsec 50 bsize 512
Oct 28 00:32:22 kefk kernel: uba: made changed
Oct 28 00:32:22 kefk kernel: uba: device 4 capacity nsec 1024000 bsize 512
Oct 28 00:32:22 kefk kernel: uba: device 4 capacity nsec 1024000 bsize 512
Oct 28 00:32:22 kefk kernel:  uba: uba1
Oct 28 00:32:22 kefk kernel:  uba: uba1
Oct 28 00:32:22 kefk kernel: kobject_register failed for uba1 (-17)
Oct 28 00:32:22 kefk kernel:  [<c01f1fd7>] kobject_register+0x51/0x5f
Oct 28 00:32:22 kefk kernel:  [<c0184720>] add_partition+0xbb/0xf0
(snip)

i.e. no lines like

uba: device 4 capacity nsec 1024000 bsize 512
uba: uba1


Apart that, removal of the usb device causes no harm to the system, log here:
Nov  2 22:55:47 kefk kernel: ehci_hcd 0000:00:1d.7: GetStatus port 3 status 
001002 POWER sig=se0  CSC
Nov  2 22:55:47 kefk kernel: hub 5-0:1.0: port 3, status 0100, change 0001, 12 
Mb/s
Nov  2 22:55:47 kefk kernel: usb 5-3: USB disconnect, address 6
Nov  2 22:55:47 kefk kernel: usb 5-3: usb_disable_device nuking all URBs
Nov  2 22:55:47 kefk kernel: usb 5-3: unregistering interface 5-3:1.0
Nov  2 22:55:47 kefk kernel: usb 5-3:1.0: hotplug
Nov  2 22:55:47 kefk kernel: usb 5-3: unregistering device
Nov  2 22:55:47 kefk kernel: usb 5-3: hotplug
Nov  2 22:55:47 kefk kernel: hub 5-0:1.0: debounce: port 3: total 100ms stable 
100ms status 0x100


-- 
Fabio Coatti       http://members.ferrara.linux.it/cova     
Ferrara Linux Users Group           http://ferrara.linux.it
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