Hi
all,
I am currently writing an rtdm driver for an fpga card.
I am using the latest Xenomai version from the svn repository and
kernel
version 2.6.24.5.
This runs on a Core2Duo with a debian 64 bit version.
The driver seems to work fine as long as I use legacy interrupts and
not MSI's.
As soon as I use pci_enable_msi before rtdm_irq_request I get:
[ 4260.359093] fpga_driver :MSI Enabled
[ 4260.359095] fpga_driver :IORESOURCE_IRQ IRQ: 248
[ 4260.359109] Unable to handle kernel NULL pointer dereference at
0000000000000000 RIP:
[ 4260.359113] [<0000000000000000>]
[ 4260.359117] PGD 3b1f7067 PUD 3b1f6067 PMD 0
[ 4260.359121] Oops: 0010 [1] SMP
[ 4260.359125] CPU 1
[ 4260.359127] Modules linked in: fpga_module(P) af_packet binfmt_misc
rfcomm
l2cap bluetooth ppdev ipv6 sbs container dock video output sbshc
battery
iptable_filter ip_tables x_tables ac coretemp max6650 sbp2 parport_pc
lp
parport atl1 mii i2c_core psmouse serio_raw button shpchp iTCO_wdt
iTCO_vendor_support intel_agp pci_hotplug evdev pcspkr ext3 jbd mbcache
sg
sr_mod cdrom ata_generic sd_mod pata_acpi usbhid hid ohci1394 ieee1394
ahci
pata_jmicron libata scsi_mod ehci_hcd uhci_hcd usbcore dm_mirror
dm_snapshot
dm_mod fan fuse
[ 4260.359179] Pid: 7016, comm: insmod Tainted:
P 2.6.24.5 #1
[ 4260.359181] RIP: 0010:[<0000000000000000>]
[<0000000000000000>]
[ 4260.359185] RSP: 0000:ffff81003b23dc80 EFLAGS: 00010246
[ 4260.359187] RAX: ffffffff805dc2c0 RBX: 0000000000000000 RCX:
ffff810001018780
[ 4260.359189] RDX: ffff81008099a000 RSI: 0000000000000000 RDI:
00000000000000f8
[ 4260.359192] RBP: ffffffff882cc688 R08: 0000000000000000 R09:
00000000000000c1
[ 4260.359194] R10: 0000000000000000 R11: 0000000000000000 R12:
ffff81003ee87800
[ 4260.359196] R13: ffffffff882cbee0 R14: 0000000000000000 R15:
000000000000000f
[ 4260.359198] FS: 00002b43257436e0(0000) GS:ffff81003ec01700(0000)
knlGS:0000000000000000
[ 4260.359200] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 4260.359202] CR2: 0000000000000000 CR3: 0000000032168000 CR4:
00000000000006e0
[ 4260.359204] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[ 4260.359206] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000400
[ 4260.359209] Process insmod (pid: 7016, threadinfo ffff81003b23c000,
task
ffff810032166fc0)
[ 4260.359210] Stack: ffffffff8041e0ff ffff81003ee87800
ffffffff802c8a58
ffff81003ee87800
[ 4260.359216] ffff81003ee87800 ffff81003ee87800 ffffffff882ca374
0000000000000000
[ 4260.359221] ffffffff882ca521 0000000000000001 ffff81003ee87870
ffffffff882cc1a0
[ 4260.359225] Call Trace:
[ 4260.359231] [<ffffffff8041e0ff>] rthal_irq_enable+0x2f/0x40
[ 4260.359236] [<ffffffff802c8a58>] rtdm_irq_request+0x48/0x60
[ 4260.359242] [<ffffffff882ca374>]
:fpga_module:pci_request_resources+0x104/0x1d0
[ 4260.359246] [<ffffffff882ca521>]
:fpga_module:pci_probe+0xe1/0x180
[ 4260.359250] [<ffffffff8039ec88>] pci_device_probe+0xf8/0x170
[ 4260.359256] [<ffffffff8040069c>]
driver_probe_device+0x9c/0x1b0
[ 4260.359259] [<ffffffff80400969>] __driver_attach+0xc9/0xd0
[ 4260.359262] [<ffffffff804008a0>] __driver_attach+0x0/0xd0
[ 4260.359265] [<ffffffff803ff8dd>] bus_for_each_dev+0x4d/0x80
[ 4260.359270] [<ffffffff803ffcec>] bus_add_driver+0xac/0x220
[ 4260.359274] [<ffffffff8039ef09>]
__pci_register_driver+0x69/0xb0
[ 4260.359280] [<ffffffff88069037>]
:fpga_module:card_init+0x37/0x64
[ 4260.359284] [<ffffffff802657be>] sys_init_module+0x18e/0x1a90
[ 4260.359293] [<ffffffff80389b28>]
_atomic_dec_and_lock+0x48/0x70
[ 4260.359298] [<ffffffff80253330>] param_get_int+0x0/0x20
[ 4260.359304] [<ffffffff8020c3f2>] system_call+0x92/0x97
[ 4260.359308]
[ 4260.359310]
[ 4260.359310] Code: Bad RIP value.
[ 4260.359313] RIP [<0000000000000000>]
[ 4260.359315] RSP <ffff81003b23dc80>
[ 4260.359316] CR2: 0000000000000000
[ 4260.359325] ---[ end trace 502b14894d3ed93b ]---
Any advice?
Jeff
and Thomas
