I've switched back to 2.6.12-rc3-mm1 and added some debuging to all the ide
functions to trace the order functions are getting called. I've shown the
result below for two different oops. There is more than one problem. The
first problem was introduced in 2.6.12-rc1-bk1 in the ide-disk changes. The
second has been around for a while but is showing up again.
The problem is idedisk_cleanup() gets called twice from ide_unregister().
Once here:
for (unit = 0; unit < MAX_DRIVES; ++unit) {
drive = &hwif->drives[unit];
if (!drive->present)
continue;
DRIVER(drive)->cleanup(drive);
}
and secondly in ide_unregister indirectly via:
blk_cleanup_queue(drive->queue);
printk(KERN_ERR "ide_unregister4()\n");
device_unregister(&drive->gendev);
down(&drive->gendev_rel_sem);
spin_lock_irq(&ide_lock);
drive->queue = NULL;
printk(KERN_ERR "ide_unregister5()\n");
device_unregister() triggers ide_drive_remove() which calls
DRIVER(drive)->cleanup(drive);
In the first call to idedisk_cleanup(), ide_disk_put(idkp) is called which
decreases the reference counter to zero. This triggers ide_disk_release()
which calls kfree(idkp). Hence the second call to idedisk_cleanup() calls
what is now a null pointer (or worse).
The solution is that ide_drive_remove() should no longer be calling
DRIVER(drive)->cleanup(drive) as the refcounting now takes care of
everything (although I'm presuming refcounting has been added to all drive
types). I removed the above call and it cures both this oops and the one
below.
The second oops is for similar reasons but "cardctl eject" doesn't succeed
highlighting a second issue. ide_unregister() is called but aborts leaving
ide-cs thinking the call succeeded when it didn't. This leads to the io
timeouts.
Solution: ide_unregister() should return failure and pass responsibility for
handling it to ide-cs or it should always succeed. I'd favour the latter as
the ide layer should really handle its own cleanup. Maybe a parameter should
be added to ide_unregister() to select the behaviour if the drive is busy/in
use? If the hardware is gone, we want it to happen regardless for example...
------------------- Opps #1 -------------------
root@c7x0:~# cardmgr
cardmgr[1900]: cannot access /lib/modules/2.6.12-rc3-mm1: No such file or
directory
cardmgr[1900]: watching 1 socket
root@c7x0:~# ide_uregister_hw_with_fixup()
init_hwif_data()
init_hwif_default()
ide_hwif_request_regions()
hwif_request_region()
hwif_request_region()
hda: KODAK LM, CFA DISK drive
ide0 at 0xc2860000-0xc2860007,0xc286000e on irq 40
ide_add_generic_settings()
ide_add_generic_settings()
ata_attach()
idedisk_attach()
ide_register_subdriver()
idedisk_setup()
hda: max request size: 128KiB
init_idedisk_capacity()
lba_capacity_is_ok()
hda: 128512 sectors (65 MB) w/1KiB Cache, CHS=1004/4/32
hda: cache flushes not supported
ide_disk_open()
ide_disk_get()
idedisk_media_changed()
idedisk_revalidate_disk()
hda:<3>ide_do_rw_disk()
hda1
idedisk_release()
ide_cacheflush_p()
ide_disk_put()
ide-cs: hda: Vcc = 3.3, Vpp = 0.0
ide_disk_open()
ide_disk_get()
idedisk_media_changed()
idedisk_revalidate_disk()
idedisk_revalidate_disk()
hda:<3>ide_do_rw_disk()
hda1
root@c7x0:~# umount /dev/hda1
idedisk_release()
ide_cacheflush_p()
ide_disk_put()
root@c7x0:~# cardctl eject
ide_unregister()
ide_unregister1()
idedisk_cleanup()
ide_cacheflush_p()
ide_unregister_subdriver()
auto_remove_settings()
ide_disk_put()
ide_disk_release()
ide_unregister2()
ide_unregister3()
ide_hwif_release_regions()
ide_unregister4()
ide_drive_remove()
Unable to handle kernel NULL pointer dereference at virtual address 00000010
pgd = c10bc000
[00000010] *pgd=a119c031, *pte=00000000, *ppte=00000000
Internal error: Oops: 17 [#1]
Modules linked in:
CPU: 0
PC is at ide_drive_remove+0x28/0x38
LR is at ide_drive_remove+0x2c/0x38
pc : [<c0152190>] lr : [<c0152194>] Not tainted
sp : c15efcb4 ip : c15efbfc fp : c15efcc4
r10: c03cb804 r9 : c0283088 r8 : 00000000
r7 : c0283260 r6 : c02832a8 r5 : c023ea10 r4 : c0283118
r3 : 00000000 r2 : 00000000 r1 : 00000000 r0 : c0283118
Flags: nZCv IRQs on FIQs on Mode SVC_32 Segment user
Control: 397F Table: A10BC000 DAC: 00000015
Process cardctl (pid: 2052, stack limit = 0xc15ee194)
Stack: (0xc15efcb4 to 0xc15f0000)
fca0: c0283200 c15efce4
c15efcc8
fcc0: c012de44 c0152174 c0283200 c0283630 c0283260 c023e590 c15efd04
c15efce8
fce0: c012d6d8 c012dd94 c0283200 c0283630 c0283260 00000000 c15efd20
c15efd08
[stack snipped]
Backtrace:
[<c0152168>] (ide_drive_remove+0x0/0x38) from [<c012de44>]
(device_release_driver+0xbc/0xc4)
r4 = C0283200
[<c012dd88>] (device_release_driver+0x0/0xc4) from [<c012d6d8>]
(bus_remove_device+0x5c/0xa8)
r7 = C023E590 r6 = C0283260 r5 = C0283630 r4 = C0283200
[<c012d67c>] (bus_remove_device+0x0/0xa8) from [<c012c7d0>]
(device_del+0x40/0x80)
r7 = 00000000 r6 = C0283260 r5 = C0283630 r4 = C0283200
[<c012c790>] (device_del+0x0/0x80) from [<c012c824>]
(device_unregister+0x14/0x20)
r6 = 00000000 r5 = C03CA0A0 r4 = C0283200
[<c012c810>] (device_unregister+0x0/0x20) from [<c01503d4>]
(ide_unregister+0x714/0x960)
r4 = C0283118
[<c014fcc0>] (ide_unregister+0x0/0x960) from [<c015da24>]
(ide_release+0x64/0x68)
[<c015d9c0>] (ide_release+0x0/0x68) from [<c015dca8>] (ide_event+0xd4/0x674)
r5 = C15EFE0C r4 = C03E8200
[<c015dbd4>] (ide_event+0x0/0x674) from [<c016e4cc>]
(send_event_callback+0x64/0x6c)
[<c016e468>] (send_event_callback+0x0/0x6c) from [<c012d4d8>]
(bus_for_each_dev+0x60/0x8c)
r4 = 00000000
[<c012d478>] (bus_for_each_dev+0x0/0x8c) from [<c016e504>]
(send_event+0x30/0x40)
r7 = 00000001 r6 = 00000001 r5 = 00000001 r4 = 00000008
[<c016e4d4>] (send_event+0x0/0x40) from [<c016e8dc>] (ds_event+0xc0/0x210)
[<c016e81c>] (ds_event+0x0/0x210) from [<c0169218>] (send_event+0xd0/0x154)
[<c0169148>] (send_event+0x0/0x154) from [<c0169440>]
(socket_shutdown+0x18/0xfc)
r7 = 00000000 r6 = 00000000 r5 = C03CB804 r4 = C03CB804
[<c0169428>] (socket_shutdown+0x0/0xfc) from [<c0169bd8>]
(socket_remove+0x14/0xa0)
r6 = 00000000 r5 = C03CB804 r4 = C03CB804
[<c0169bc4>] (socket_remove+0x0/0xa0) from [<c016a278>]
(pcmcia_eject_card+0x94/0x98)
r5 = C03CB804 r4 = C03CB930
[<c016a1e4>] (pcmcia_eject_card+0x0/0x98) from [<c0171564>]
(ds_ioctl+0xa30/0xc14)
r6 = C03CB804 r5 = 0000640E r4 = 00000000
[<c0170b34>] (ds_ioctl+0x0/0xc14) from [<c0095e30>] (do_ioctl+0x6c/0xa0)
[<c0095dc4>] (do_ioctl+0x0/0xa0) from [<c0095ef8>] (vfs_ioctl+0x94/0x328)
r7 = 00000000 r6 = 00000000 r5 = 00000003 r4 = C18FC180
[<c0095e64>] (vfs_ioctl+0x0/0x328) from [<c00961cc>] (sys_ioctl+0x40/0x64)
r8 = C001CFA4 r7 = 00000036 r6 = 0000640E r5 = FFFFFFF7
r4 = C18FC180
[<c009618c>] (sys_ioctl+0x0/0x64) from [<c001ce20>]
(ret_fast_syscall+0x0/0x2c)
r6 = BEEE5D90 r5 = 00000000 r4 = 00000000
Code: ebfb9b8b e1a00004 e594301c e1a0e00f (e593f010)
Segmentation fault
------------------- Opps #2 -------------------
root@c7x0:~# cardmgr
cardmgr[1804]: watching 1 socket
root@c7x0:~# ide_uregister_hw_with_fixup()
init_hwif_data()
init_hwif_default()
ide_hwif_request_regions()
hwif_request_region()
hwif_request_region()
hda: KODAK LM, CFA DISK drive
ide0 at 0xc2860000-0xc2860007,0xc286000e on irq 40
ide_add_generic_settings()
ata_attach()
idedisk_attach()
ide_register_subdriver()
idedisk_setup()
hda: max request size: 128KiB
init_idedisk_capacity()
lba_capacity_is_ok()
hda: 128512 sectors (65 MB) w/1KiB Cache, CHS=1004/4/32
hda: cache flushes not supported
ide_disk_open()
ide_disk_get()
idedisk_media_changed()
idedisk_revalidate_disk()
hda: hda1
idedisk_release()
ide_cacheflush_p()
ide_disk_put()
ide-cs: hda: Vcc = 3.3, Vpp = 0.0
ide_disk_open()
ide_disk_get()
idedisk_media_changed()
idedisk_revalidate_disk()
idedisk_revalidate_disk()
hda: hda1
root@c7x0:~#
root@c7x0:~# cardctl eject
ide_unregister()
ide_unregister() abort
root@c7x0:~# hda: status timeout: status=0x88 { Busy }
ide: failed opcode was: 0xec
hda: drive not ready for command
hda: status timeout: status=0x88 { Busy }
ide: failed opcode was: 0xec
hda: drive not ready for command
root@c7x0:~# carhda: status timeout: status=0x88 { Busy }
ide: failed opcode was: 0xec
hda: drive not ready for command
didedisk_release()
ide_cacheflush_p()
ide_disk_put()
ctl eject
root@c7x0:~# root@c7x0:~# cardctl insert
root@c7x0:~# ide_uregister_hw_with_fixup()
ide_unregister()
ide_unregister1()
idedisk_cleanup()
ide_cacheflush_p()
ide_unregister_subdriver()
auto_remove_settings()
ide_disk_put()
ide_disk_release()
ide_unregister2()
ide_unregister3()
ide_hwif_release_regions()
ide_unregister4()
ide_drive_remove()
Unable to handle kernel NULL pointer dereference at virtual address 00000010
pgd = c17c8000
[00000010] *pgd=a1614031, *pte=00000000, *ppte=00000000
Internal error: Oops: 17 [#1]
Modules linked in:
CPU: 0
PC is at ide_drive_remove+0x28/0x38
LR is at ide_drive_remove+0x2c/0x38
pc : [<c0152190>] lr : [<c0152194>] Not tainted
sp : c125bbb0 ip : c125baf8 fp : c125bbc0
r10: 00000000 r9 : c0283088 r8 : c0283088
r7 : c0283260 r6 : c02832a8 r5 : c023ea10 r4 : c0283118
r3 : 00000000 r2 : 00000000 r1 : 00000000 r0 : c0283118
Flags: nZCv IRQs on FIQs on Mode SVC_32 Segment user
Control: 397F Table: A17C8000 DAC: 00000015
Process cardmgr (pid: 1805, stack limit = 0xc125a194)
Stack: (0xc125bbb0 to 0xc125c000)
bba0: c0283200 c125bbe0 c125bbc4
c012de44
bbc0: c0152174 c0283200 c0283630 c0283260 c023e590 c125bc00 c125bbe4
c012d6d8
bbe0: c012dd94 c0283200 c0283630 c0283260 00000000 c125bc1c c125bc04
c012c7d0
[stack snipped]
Backtrace:
[<c0152168>] (ide_drive_remove+0x0/0x38) from [<c012de44>]
(device_release_driver+0xbc/0xc4)
r4 = C0283200
[<c012dd88>] (device_release_driver+0x0/0xc4) from [<c012d6d8>]
(bus_remove_device+0x5c/0xa8)
r7 = C023E590 r6 = C0283260 r5 = C0283630 r4 = C0283200
[<c012d67c>] (bus_remove_device+0x0/0xa8) from [<c012c7d0>]
(device_del+0x40/0x80)
r7 = 00000000 r6 = C0283260 r5 = C0283630 r4 = C0283200
[<c012c790>] (device_del+0x0/0x80) from [<c012c824>]
(device_unregister+0x14/0x20)
r6 = 00000000 r5 = C03CC0A0 r4 = C0283200
[<c012c810>] (device_unregister+0x0/0x20) from [<c01503d4>]
(ide_unregister+0x714/0x960)
r4 = C0283118
[<c014fcc0>] (ide_unregister+0x0/0x960) from [<c015086c>]
(ide_register_hw_with_fixup+0x1c0/0x1f8)
[<c01506ac>] (ide_register_hw_with_fixup+0x0/0x1f8) from [<c015d9b4>]
(idecs_register+0xa4/0xb0)
[<c015d910>] (idecs_register+0x0/0xb0) from [<c015e078>]
(ide_event+0x4a4/0x674)
r7 = C286000E r6 = C03E6460 r5 = C03E8214 r4 = 00000000
[<c015dbd4>] (ide_event+0x0/0x674) from [<c016e774>]
(pcmcia_register_client+0x260/0x308)
[<c016e514>] (pcmcia_register_client+0x0/0x308) from [<c015db90>]
(ide_attach+0xb8/0xfc)
[<c015dad8>] (ide_attach+0x0/0xfc) from [<c016d564>]
(pcmcia_device_probe+0xc0/0x18c)
r6 = C03E8260 r5 = C023EB30 r4 = C03E8200
[<c016d4a4>] (pcmcia_device_probe+0x0/0x18c) from [<c012dbd0>]
(driver_probe_device+0x4c/0xb0)
r8 = 00000050 r7 = C012DC34 r6 = 00000000 r5 = C023EB40
r4 = C03E8260
[<c012db84>] (driver_probe_device+0x0/0xb0) from [<c012d564>]
(bus_for_each_drv+0x60/0x8c)
r6 = C03E8260 r5 = C125BE60 r4 = 00000000
[<c012d504>] (bus_for_each_drv+0x0/0x8c) from [<c012dcd4>]
(device_attach+0x8c/0x98)
r7 = C012D8CC r6 = C125BEE4 r5 = C03E8308 r4 = C03E8260
[<c012dc48>] (device_attach+0x0/0x98) from [<c012d8f4>]
(bus_rescan_devices_helper+0x28/0x40)
r5 = C125BEB8 r4 = C125BEE4
[<c012d8cc>] (bus_rescan_devices_helper+0x0/0x40) from [<c012d4d8>]
(bus_for_each_dev+0x60/0x8c)
r4 = 00000000
[<c012d478>] (bus_for_each_dev+0x0/0x8c) from [<c012d930>]
(bus_rescan_devices+0x24/0x30)
r7 = 00039300 r6 = C03E8200 r5 = C050643C r4 = C03CD930
[<c012d90c>] (bus_rescan_devices+0x0/0x30) from [<c0171438>]
(ds_ioctl+0x904/0xc14)
[<c0170b34>] (ds_ioctl+0x0/0xc14) from [<c0095e30>] (do_ioctl+0x6c/0xa0)
[<c0095dc4>] (do_ioctl+0x0/0xa0) from [<c0095ef8>] (vfs_ioctl+0x94/0x328)
r7 = 00000000 r6 = 00039300 r5 = 00000004 r4 = C1441AC0
[<c0095e64>] (vfs_ioctl+0x0/0x328) from [<c00961cc>] (sys_ioctl+0x40/0x64)
r8 = C001CFA4 r7 = 00000036 r6 = C050643C r5 = FFFFFFF7
r4 = C1441AC0
[<c009618c>] (sys_ioctl+0x0/0x64) from [<c001ce20>]
(ret_fast_syscall+0x0/0x2c)
r6 = 00034738 r5 = 00000001 r4 = 00000001
Code: ebfb9b8b e1a00004 e594301c e1a0e00f (e593f010)
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