Re: Spinup of SCSI Disks: allow_restart won't work on 2.6.18

[Joern Quillman <quillman@fbihome.de>]

Stefan Richter wrote
>> One problem left. I still can't set or unset the flag with echo even on 
>> 2.6.19-rc6 (as root). Always getting a write error. Not that I care much 
>> about this, 'cause I for sure don't want it disabled.
>> But it's strange nonethless.
>>     
>
> But the attribute has write permission set? (ls -l)
> It is writable on the last kernel I tried, which is -rc4.
>   
Yep
Permissions of the file are -rw-r--r--. Owner is of course root.
As I wrote before I can set/unset the flag without any problems when I 
connect a dumb USB<->IDE
converter with kernel 2.6.18. Same with 2.6.19-rc6.

The complete error message (sorry it's in german here) is:
"-bash: echo: write error: Das Argument ist ungueltig"

Is there a way to do some debug on the internals to see why the 
attribute isn't actually writeable? Do you need parts of the kernel log?

A new problem just arised:
When I switch on the external enclosure with 3 bridges and 3 disks a few 
seconds "before" I plug the firewire connector into the PC everything works.
But when I first plug in the connector and turn on the external 
enclosure later, 2.6.19-rc6 hangs on the first disk and throws a BUG 
message.
I have to reboot the PC then and I reproduced it serveral times.

------------------snip----------------------------------
ieee1394: Error parsing configrom for node 0-00:1023
ieee1394: Error parsing configrom for node 0-01:1023
ieee1394: Error parsing configrom for node 0-02:1023
ieee1394: Node changed: 0-00:1023 -> 0-03:1023
ieee1394: Node added: ID:BUS[0-00:1023]  GUID[0001d20000091ab2]
ieee1394: Node added: ID:BUS[0-01:1023]  GUID[0001d20000093c4d]
ieee1394: Error parsing configrom for node 0-02:1023
scsi0 : SBP-2 IEEE-1394
ieee1394: sbp2: Logged into SBP-2 device
ieee1394: Node 0-00:1023: Max speed [S400] - Max payload [1024]
scsi 0:0:0:0: Direct-Access-RBC Maxtor 4 D080H4           DAK0 PQ: 0 ANSI: 4
scsi1 : SBP-2 IEEE-1394
SCSI device sda: 160086528 512-byte hdwr sectors (81964 MB)
sda: Write Protect is off
sda: Mode Sense: 11 00 00 00
SCSI device sda: drive cache: write back
SCSI device sda: 160086528 512-byte hdwr sectors (81964 MB)
sda: Write Protect is off
sda: Mode Sense: 11 00 00 00
SCSI device sda: drive cache: write back
 sda: sda1
sd 0:0:0:0: Attached scsi disk sda
ieee1394: sbp2: Error logging into SBP-2 device - timed out
sbp2: probe of 0001d20000093c4d-0 failed with error -16
------------[ cut here ]------------
kernel BUG at fs/sysfs/file.c:460!
invalid opcode: 0000 [#1]
SMP
Modules linked in: sd_mod nfs nfsd exportfs lockd nfs_acl sunrpc button 
ac battery ipv6 de4x5 dm_snapshot dm_mirror dm_mod sr_mod sbp2 scsi_mod 
ehci_hcd ohci_hcd tulip joydev tsdev pcmcia firmware_class evdev 
i810_audio ac97_codec psmouse serio_raw floppy snd_intel8x0 yenta_socket 
snd_ac97_codec snd_ac97_bus rsrc_nonstatic pcmcia_core snd_pcm snd_timer 
snd soundcore snd_page_alloc parport_pc parport i2c_piix4 pcspkr 
i2c_core rtc ext3 jbd mbcache ide_generic ide_cd cdrom ide_disk uhci_hcd 
piix generic ide_core usbcore ohci1394 ieee1394 thermal processor fan
CPU:    0
EIP:    0060:[<c01966c6>]    Not tainted VLI
EFLAGS: 00010202   (2.6.19-rc6 #1)
EIP is at sysfs_create_file+0x19/0x31
eax: c7d03800   ebx: cc85f12c   ecx: c7d038b0   edx: cc85f101
esi: cc85f12c   edi: 00000000   ebp: c7d03800   esp: cb5f1eb8
ds: 007b   es: 007b   ss: 0068
Process knodemgrd_0 (pid: 549, ti=cb5f0000 task=cb595ab0 task.ti=cb5f0000)
Stack: c7d03838 c021ed64 c7d03838 00000001 c7d03994 cc84f029 c7d03a14 
00000014
       cc853f32 cae3f0f4 00000000 cae3f000 fffffffc c7d03800 ccc6b000 
00000000
       00000000 cc84f45c fffffffc ccafd058 cae3f000 cb65d3f8 00000000 
01afd058
Call Trace:
 [<c021ed64>] device_create_file+0x1c/0x2b
 [<cc84f029>] nodemgr_register_device+0xd0/0x150 [ieee1394]
 [<cc84f45c>] nodemgr_process_unit_directory+0x333/0x348 [ieee1394]
 [<cc84f668>] nodemgr_probe_ne+0x183/0x37a [ieee1394]
 [<cc850204>] nodemgr_host_thread+0x827/0x970 [ieee1394]
 [<cc84f9dd>] nodemgr_host_thread+0x0/0x970 [ieee1394]
 [<c01304d2>] kthread+0xc2/0xf0
 [<c0130410>] kthread+0x0/0xf0
 [<c01038bb>] kernel_thread_helper+0x7/0x10
 =======================
Code: 83 c0 74 e8 65 08 10 00 89 e8 83 c4 10 5b 5e 5f 5d c3 85 c0 89 c1 
53 89 d3 74 10 83 78 30 00 0f 94 c2 85 db 0f 94 c0 08 c2 74 08 <0f> 0b 
cc 01 d0 56 2b c0 8b 41 30 89 da b9 04 00 00 00 5b e9 5e
EIP: [<c01966c6>] sysfs_create_file+0x19/0x31 SS:ESP 0068:cb5f1eb8
------------------------snip------------------------------------------------

Joern