Message-ID: <20081230215953.235ce1b4@neptune.home>
Date:	Tue, 30 Dec 2008 21:59:53 +0100
From:	Bruno Prémont <bonbons@...ux-vserver.org>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	linux-ide@...r.kernel.org,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-scsi@...r.kernel.org
Subject: Re: S3 with pata_via fails to resume, ide_via82Cxxx works

On Tue, 30 December 2008 Bruno Prémont wrote:
> Secondary note, with ATA subsystem it is possible to discover
> hot-plugged second SATA drive with issuing
>   echo '- - -' > host0/scsi_host/host0/scan
> though the same action causes the access to first SATA drive to fail
> after removing second drive. (unfortunately BIOS does only allows
> configuring the chipset in IDE mode - so not possible to use SATA_VIA
> or AHCI). I guess this is caused by some incorrect detection of speed
> settings.
> 
> What is the way to ask driver to rescan with IDE driver?
I found:
  Documentation/ide/warm-plug-howto.txt


Doing just:
  echo -n "1" > /sys/class/ide_port/idex/scan
causes the following BUG():
<<<< during boot
Dec 30 18:19:50 venus [    3.909946] Uniform Multi-Platform E-IDE driver
Dec 30 18:19:50 venus [    3.913075] via82cxxx 0000:00:0f.0: VIA cx700 (rev 00) IDE UDMA133
Dec 30 18:19:50 venus [    3.916069] via82cxxx 0000:00:0f.0: IDE controller (0x1106:0x0581 rev 0x00)
Dec 30 18:19:50 venus [    3.919138] via82cxxx 0000:00:0f.0: not 100% native mode: will probe irqs later
Dec 30 18:19:50 venus [    3.924945]     ide0: BM-DMA at 0xff00-0xff07
Dec 30 18:19:50 venus [    3.927990]     ide1: BM-DMA at 0xff08-0xff0f
Dec 30 18:19:50 venus [    3.930901] Probing IDE interface ide0...
Dec 30 18:19:50 venus [    4.050047] Marking TSC unstable due to cpufreq changes
Dec 30 18:19:50 venus [    4.370099] hda: FUJITSU MHY2250BH, ATA DISK drive
Dec 30 18:19:50 venus [    4.390026] Clocksource tsc unstable (delta = -215834270 ns)
Dec 30 18:19:50 venus [    4.730309] hda: host max PIO5 wanted PIO255(auto-tune) selected PIO4
Dec 30 18:19:50 venus [    4.730462] hda: UDMA/100 mode selected
Dec 30 18:19:50 venus [    4.735541] Probing IDE interface ide1...
Dec 30 18:19:50 venus [    5.420127] hdd: , ATA DISK drive
Dec 30 18:19:50 venus [    5.480288] hdd: host max PIO5 wanted PIO255(auto-tune) selected PIO2
Dec 30 18:19:50 venus [    5.480330] hdd: UDMA/66 mode selected
Dec 30 18:19:50 venus [    5.485099] ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
Dec 30 18:19:50 venus [    5.565605] ide1 at 0x170-0x177,0x376 on irq 15
Dec 30 18:19:50 venus [    5.573072] ide-gd driver 1.18
Dec 30 18:19:50 venus [    5.577684] hda: max request size: 512KiB
Dec 30 18:19:50 venus [    5.582339] hda: 488397168 sectors (250059 MB) w/8192KiB Cache, CHS=30401/255/63
Dec 30 18:19:50 venus [    5.592346] hda: cache flushes supported
Dec 30 18:19:50 venus [    5.597500]  hda: hda1 hda2 hda3 hda4 hda5 hda6
Dec 30 18:19:50 venus [    5.646208] hdd: max request size: 128KiB
Dec 30 18:19:50 venus [    5.651361] hdd: 8043840 sectors (4118 MB) w/1KiB Cache, CHS=7980/16/63
Dec 30 18:19:50 venus [    5.656901]  hdd: hdd1
-- snip --
<<<< some time later, triggering the scan
Dec 30 21:35:55 venus [ 7866.335247] Probing IDE interface ide0...
Dec 30 21:35:55 venus [ 7866.650105] hda: FUJITSU MHY2250BH, ATA DISK drive
Dec 30 21:35:56 venus [ 7867.370055] hda: host max PIO5 wanted PIO255(auto-tune) selected PIO4
Dec 30 21:35:56 venus [ 7867.370221] hda: UDMA/100 mode selected
Dec 30 21:35:56 venus [ 7867.370375] BUG: unable to handle kernel NULL pointer dereference at 0000000c
Dec 30 21:35:56 venus [ 7867.370400] IP: [<c0248bf6>] elv_may_queue+0x6/0x20
Dec 30 21:35:56 venus [ 7867.370440] *pde = 00000000 
Dec 30 21:35:56 venus [ 7867.370459] Oops: 0000 [#1] 
Dec 30 21:35:56 venus [ 7867.375572] last sysfs file: /sys/devices/pci0000:00/0000:00:0f.0/ide0/ide_port/ide0/scan
Dec 30 21:35:56 venus [ 7867.380014] Modules linked in: snd_hda_intel snd_pcm snd_timer snd soundcore snd_page_alloc via_agp agpgart
Dec 30 21:35:56 venus [ 7867.380014] 
Dec 30 21:35:56 venus [ 7867.380014] Pid: 1855, comm: bash Not tainted (2.6.28-ide #3) CX700+W697HG
Dec 30 21:35:56 venus [ 7867.380014] EIP: 0060:[<c0248bf6>] EFLAGS: 00010046 CPU: 0
Dec 30 21:35:56 venus [ 7867.380014] EIP is at elv_may_queue+0x6/0x20
Dec 30 21:35:56 venus [ 7867.380014] EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000
Dec 30 21:35:56 venus [ 7867.380014] ESI: 00000000 EDI: 00000010 EBP: f6bb3e28 ESP: f6bb3e24
Dec 30 21:35:56 venus [ 7867.380014]  DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068
Dec 30 21:35:56 venus [ 7867.380014] Process bash (pid: 1855, ti=f6bb3000 task=f7110d80 task.ti=f6bb3000)
Dec 30 21:35:56 venus [ 7867.380014] Stack:
Dec 30 21:35:56 venus [ 7867.380014]  00000000 f6bb3e50 c024b40b 00000000 000000e1 f7005890 00000078 00000282
Dec 30 21:35:56 venus [ 7867.380014]  00000000 f73d0020 00000000 f6bb3e80 c024b82c 00000010 00000000 f6bb3e7c
Dec 30 21:35:56 venus [ 7867.380014]  00000282 00000001 000000e1 000000e1 00000001 f73d0020 f6bb3ee4 f6bb3e8c
Dec 30 21:35:56 venus [ 7867.380014] Call Trace:
Dec 30 21:35:56 venus [ 7867.380014]  [<c024b40b>] ? get_request+0x1b/0x240
Dec 30 21:35:56 venus [ 7867.380014]  [<c024b82c>] ? get_request_wait+0x1c/0xd0
Dec 30 21:35:56 venus [ 7867.380014]  [<c024bc48>] ? blk_get_request+0x18/0x30
Dec 30 21:35:56 venus [ 7867.380014]  [<c02e2d3a>] ? ide_raw_taskfile+0x2a/0x90
Dec 30 21:35:56 venus [ 7867.380014]  [<c02e2e21>] ? taskfile_lib_get_identify+0x61/0x70
Dec 30 21:35:56 venus [ 7867.380014]  [<c02e5ff0>] ? ide_acpi_port_init_devices+0x90/0xe0
Dec 30 21:35:56 venus [ 7867.380014]  [<c02e2379>] ? ide_port_scan+0x39/0x50
Dec 30 21:35:56 venus [ 7867.380014]  [<c02e23d1>] ? store_scan+0x41/0x60
Dec 30 21:35:56 venus [ 7867.380014]  [<c02e2390>] ? store_scan+0x0/0x60
Dec 30 21:35:56 venus [ 7867.380014]  [<c02cc03c>] ? dev_attr_store+0x2c/0x40
Dec 30 21:35:56 venus [ 7867.380014]  [<c01a468d>] ? sysfs_write_file+0x9d/0x100
Dec 30 21:35:56 venus [ 7867.380014]  [<c016b215>] ? vfs_write+0x95/0x120
Dec 30 21:35:56 venus [ 7867.380014]  [<c01a45f0>] ? sysfs_write_file+0x0/0x100
Dec 30 21:35:56 venus [ 7867.380014]  [<c016b34d>] ? sys_write+0x3d/0x70
Dec 30 21:35:56 venus [ 7867.380014]  [<c0103b01>] ? sysenter_do_call+0x12/0x25
Dec 30 21:35:56 venus [ 7867.380014] Code: bf 00 00 00 00 55 8b 40 0c 89 e5 8b 00 8b 48 34 85 c9 74 04 89 d0 ff d1 5d c3 8d 74 26 00 8d bc 27 00 00 00 00 55 89 e5 53 89 c3 <8b> 40 0c 8b 00 8b 48 38 31 c0 85 c9 74 04 89 d8 ff d1 5b 5d c3 
Dec 30 21:35:56 venus [ 7867.380014] EIP: [<c0248bf6>] elv_may_queue+0x6/0x20 SS:ESP 0068:f6bb3e24
Dec 30 21:35:56 venus [ 7867.380014] ---[ end trace b966cf347b1167e4 ]---
Dec 30 21:36:15 venus [ 7886.330025] ide_timer_expiry: hwgroup->drive was NULL
Dec 30 21:36:29 venus [ 7899.770239] Buffer I/O error on device hda3, logical block 115511
Dec 30 21:36:29 venus [ 7899.777078] lost page write due to I/O error on hda3
Dec 30 21:36:29 venus [ 7899.783856] Buffer I/O error on device hda3, logical block 115512
Dec 30 21:36:29 venus [ 7899.790570] lost page write due to I/O error on hda3

Same effect with:
  cd /sys/class/ide_port/ide0/
  sync; sleep 1; echo -n 1 > delete_devices; sleep 1; echo -n 1 > scan

Bruno
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