(I sent a previous version of this e-mail to the linux-scsi and usb-storage
mailinglists mentioned in MAINTAINERS, but received no response)
When I unplug my USB Mass Storage device after unmounting it, I get the following
badness message:
usb 1-1.2: USB disconnect, address 4
Badness in atomic_dec_and_test at include/asm/atomic.h:150
Call Trace:
[<c02184f0>] kobject_put+0x7e/0x80
[<e4cc7adb>] scsi_remove_host+0x104/0x1a0 [scsi_mod]
[<e4cbbe5f>] dissociate_dev+0x55/0xd2 [usb_storage]
[<e4cbc269>] storage_disconnect+0x38/0x48 [usb_storage]
[<c02c311d>] usb_unbind_interface+0xa4/0xa6
[<c02845ee>] device_release_driver+0x64/0x66
[<c028474e>] bus_remove_device+0x73/0xb8
[<c02836dd>] device_del+0x6c/0xa0
[<c02cba42>] usb_disable_device+0x71/0xac
[<c02c3ee7>] usb_disconnect+0xc3/0x10e
[<c02c6ee9>] hub_port_connect_change+0x339/0x33e
[<c02c67e9>] hub_port_status+0x3c/0xa7
[<c02c72d5>] hub_events+0x3e7/0x565
[<c02c7480>] hub_thread+0x2d/0xe3
[<c03b8c0e>] ret_from_fork+0x6/0x14
[<c0120d8c>] default_wake_function+0x0/0x2e
[<c02c7453>] hub_thread+0x0/0xe3
[<c01092a9>] kernel_thread_helper+0x5/0xb
The device is a 256MB flash disk with an OTi controller chip. When I insert it
it is detected like this, and works perfectly fine:
hub 1-1:1.0: new USB device on port 2, assigned address 4
SCSI subsystem initialized
Initializing USB Mass Storage driver...
scsi0 : SCSI emulation for USB Mass Storage devices
Vendor: STF Model: Flash Drive Rev: 1.89
Type: Direct-Access ANSI SCSI revision: 02
WARNING: USB Mass Storage data integrity not assured
USB Mass Storage device found at 4
drivers/usb/core/usb.c: registered new driver usb-storage
USB Mass Storage support registered.
sda: Unit Not Ready, sense:
Current : sense = 70 6
ASC=28 ASCQ= 0
Raw sense data:0x70 0x00 0x06 0x00 0x00 0x00 0x00 0x0a 0x00 0x00 0x00 0x00 0x28 0x00
0x00 0x00 0x00 0x00
SCSI device sda: 512000 512-byte hdwr sectors (262 MB)
sda: Write Protect is off
sda: Mode Sense: 00 06 94 00
sda: assuming drive cache: write through
sda: sda1
Attached scsi removable disk sda at scsi0, channel 0, id 0, lun 0
I have the SCSI core, the SCSI disk core and USB storage compiled as modules.
The badness message is 100% repeatable; it occurs every time this particular
device is unplugged.
TIA
Brad
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Bradley Chapman [[email protected]] wrote:
> (I sent a previous version of this e-mail to the linux-scsi and usb-storage
> mailinglists mentioned in MAINTAINERS, but received no response)
>
> When I unplug my USB Mass Storage device after unmounting it, I get the following
> badness message:
Greg posted a response the other day to a query from Alan Stern. Here is
the link
http://marc.theaimsgroup.com/?l=linux-kernel&m=106835250124362&w=2
This should be the same problem that you are hitting.
A patch was checked into Linus's tree on 2003-11-07 by Greg that made a
couple line change to class.c.
Here is the patch in case you need to stay on mm2.
-andmike
--
Michael Anderson
[email protected]
--- 1.41/drivers/base/class.c Fri Aug 29 14:18:26 2003
+++ 1.42/drivers/base/class.c Fri Nov 7 06:48:28 2003
@@ -255,6 +255,7 @@
void class_device_initialize(struct class_device *class_dev)
{
+ kobj_set_kset_s(class_dev, class_obj_subsys);
kobject_init(&class_dev->kobj);
INIT_LIST_HEAD(&class_dev->node);
}
@@ -277,7 +278,6 @@
/* first, register with generic layer. */
kobject_set_name(&class_dev->kobj, class_dev->class_id);
- kobj_set_kset_s(class_dev, class_obj_subsys);
if (parent)
class_dev->kobj.parent = &parent->subsys.kset.kobj;