[Linux-fbdev-devel] Problem with viafb module. Bug ?

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Hi !

during module regression test (just some stupid load/unload testing) on 2.6.28-rc2-git3-default, i have come across an issue which i assume is caused by viafb.

after a while of testing, i was getting weird oopses, mostly for duplicate sysfs entries with i2c-core.
another oops is below - it happened on loading tvp5150. (just an example)
the oops never happen if i never load (i.e. modprobe) viafb before.
after excluding viafb from my modules list, i see no oopses or sysfs registration problems anymore.

furthermore, viafb module-init lasts around 10 seconds on my system (vmware virtual machine) - 10 seconds to detect that there is no
via graphics hardware present looks weird to me, too. 
almost every other linux kernel module is much quicker with detecting that the appropriate hardware is missing.

maybe it`s worth taking a look at that ?

regards
Roland Kletzing

Oct 30 21:17:54 opensuse103 kernel: BUG: unable to handle kernel NULL pointer dereference at 00000001
Oct 30 21:17:54 opensuse103 kernel: IP: [<f09ac2be>] 0xf09ac2be
Oct 30 21:17:54 opensuse103 kernel: *pde = 00000000
Oct 30 21:17:54 opensuse103 kernel: Oops: 0002 [#1] SMP
Oct 30 21:17:54 opensuse103 kernel: last sysfs file: /sys/firmware/edd/int13_dev80/extensions
Oct 30 21:17:54 opensuse103 kernel: Modules linked in: tvp5150(+) viafb(+) ovcamchip ov7670 v4l2_common dvb_usb_af9005_remote fb i2c_algo_bit cfbcopyarea cfbimgblt cfbfillrect iptable_filter ip_tables ip6table_filter ip6_tables x_tables ipv6 af_packet microcode firmware_class fuse loop dm_mod ide_cd_mod cdrom pata_acpi ata_piix mousedev ahci ata_generic serio_raw libata psmouse ppdev 8250_pnp ide_pci_generic 8250 shpchp rtc_cmos intel_agp parport_pc piix i2c_piix4 pcnet32 pci_hotplug rtc_core agpgart pcspkr parport mii evdev serial_core ide_core container button ac i2c_core rtc_lib floppy uhci_hcd usbcore edd ext3 mbcache jbd fan mptsas scsi_transport_sas mptfc scsi_transport_fc scsi_tgt mptspi mptscsih mptbase scsi_transport_spi sd_mod crc_t10dif sg scsi_mod thermal processor thermal_sys [last unloaded: cs53l32a]
Oct 30 21:17:54 opensuse103 kernel:
Oct 30 21:17:54 opensuse103 kernel: Pid: 5533, comm: modprobe Tainted: G        W  (2.6.28-rc2-git3-default #4) VMware Virtual Platform
Oct 30 21:17:54 opensuse103 kernel: EIP: 0060:[<f09ac2be>] EFLAGS: 00010286 CPU: 0
Oct 30 21:17:54 opensuse103 kernel: EIP is at 0xf09ac2be
Oct 30 21:17:54 opensuse103 kernel: EAX: ee8bf370 EBX: ee8bf554 ECX: 00000001 EDX: 00000000
Oct 30 21:17:54 opensuse103 kernel: ESI: ee8bf378 EDI: 00000001 EBP: efbcfe10 ESP: efbcfd48
Oct 30 21:17:54 opensuse103 kernel:  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Oct 30 21:17:54 opensuse103 kernel: Process modprobe (pid: 5533, ti=efbce000 task=ef8a70b0 task.ti=efbce000)
Oct 30 21:17:54 opensuse103 kernel: Stack:
Oct 30 21:17:54 opensuse103 kernel:  f087c010 efbcfe14 f087c457 c03be780 c1609780 082c17d3 00000e61 c0137c21
Oct 30 21:17:54 opensuse103 kernel:  00000000 00000000 ffffffe1 00000001 ee8bf374 00000001 ee8bf554 00000096
Oct 30 21:17:54 opensuse103 kernel:  c029ba4b c011cf66 ee88fc3c edbb53f0 f087c86c ee8bf374 00000001 efbcfe10
Oct 30 21:17:54 opensuse103 kernel: Call Trace:
Oct 30 21:17:54 opensuse103 kernel:  [<f087c010>] i2c_start+0xa/0x2c [i2c_algo_bit]
Oct 30 21:17:54 opensuse103 kernel:  [<f087c457>] bit_xfer+0x20/0x3f8 [i2c_algo_bit]
Oct 30 21:17:54 opensuse103 kernel:  [<c0137c21>] sched_clock_cpu+0x109/0x116
Oct 30 21:17:54 opensuse103 kernel:  [<c029ba4b>] _spin_lock+0x5/0x7
Oct 30 21:17:54 opensuse103 kernel:  [<c011cf66>] task_rq_lock+0x3b/0x61
Oct 30 21:17:54 opensuse103 kernel:  [<f163e325>] i2c_transfer+0x5c/0x6d [i2c_core]
Oct 30 21:17:54 opensuse103 kernel:  [<f163e6d5>] i2c_smbus_xfer+0x39f/0x496 [i2c_core]
Oct 30 21:17:54 opensuse103 kernel:  [<c011cea5>] __wake_up+0x29/0x39
Oct 30 21:17:54 opensuse103 kernel:  [<c02502b8>] netlink_broadcast+0x275/0x2b6
Oct 30 21:17:54 opensuse103 kernel:  [<c029ba4b>] _spin_lock+0x5/0x7
Oct 30 21:17:54 opensuse103 kernel:  [<c028fc2d>] klist_next+0x62/0x79
Oct 30 21:17:54 opensuse103 kernel:  [<f163e9d6>] i2c_probe_address+0x5f/0xc5 [i2c_core]
Oct 30 21:17:54 opensuse103 kernel:  [<f163f96b>] i2c_probe+0x123/0x130 [i2c_core]
Oct 30 21:17:54 opensuse103 kernel:  [<f1cd89ae>] tvp5150_detect_client+0x0/0x107 [tvp5150]
Oct 30 21:17:54 opensuse103 kernel:  [<f1cd89ae>] tvp5150_detect_client+0x0/0x107 [tvp5150]
Oct 30 21:17:54 opensuse103 kernel:  [<f163f1ca>] __attach_adapter+0x19/0x1e [i2c_core]
Oct 30 21:17:54 opensuse103 kernel:  [<c022004f>] class_for_each_device+0x51/0x72
Oct 30 21:17:54 opensuse103 kernel:  [<f163edb6>] i2c_register_driver+0x9c/0xb9 [i2c_core]
Oct 30 21:17:54 opensuse103 kernel:  [<f163f1b1>] __attach_adapter+0x0/0x1e [i2c_core]
Oct 30 21:17:54 opensuse103 kernel:  [<f0dc3000>] tvp5150_init+0x0/0xf [tvp5150]
Oct 30 21:17:54 opensuse103 kernel:  [<c010113d>] _stext+0x4d/0x148
Oct 30 21:17:54 opensuse103 kernel:  [<c0142936>] load_module+0x12cd/0x142e
Oct 30 21:17:54 opensuse103 kernel:  [<f163ea81>] i2c_master_send+0x0/0x42 [i2c_core]
Oct 30 21:17:54 opensuse103 kernel:  [<c0142b1e>] sys_init_module+0x87/0x176
Oct 30 21:17:54 opensuse103 kernel:  [<c01039eb>] sysenter_do_call+0x12/0x2f
Oct 30 21:17:54 opensuse103 kernel: Code: 6c 3d 25 64 0a 00 3c 33 3e 25 73 2f 25 64 3a 20 43 61 6e 27 74 20 67 65 74 20 4d 4d 49 4f 20 6d 65 6d 6f 72 79 20 40 20 30 78 25 <6c> 6c 78 2c 20 73 75 62 73 79 73 74 65 6d 3a 20 25 30 34 78 3a
Oct 30 21:17:54 opensuse103 kernel: EIP: [<f09ac2be>] 0xf09ac2be SS:ESP 0068:efbcfd48
Oct 30 21:17:54 opensuse103 kernel: ---[ end trace 4eaa2a86a8e2da22 ]---
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