TI-Davinci 6446 oops on interrupts

[Holger Freyther]

Hi,

my not mainlined with custom drivers board support seems to suffer from an
issue introduced by moving the irq.c to the generic GPIO interrupt code
(aac4dd1dab8acfc244d697473d2a5f4424a5746c, reverting it makes the oops go
away). I think this is caused by either interrupt #46 or #47 on this system
which is on the second 'bank'.

At first I thought that the usage of IRQ_ENT_REG1_OFFSET and IRQ_REG1_OFFSET
was simply omitted but there is the for loop that counts j by four (offset
between REG0 and REG1).


Is this issue known to anyone? I feel try to understand this a bit more as
well and try to come up with a patch.


Unable to handle kernel paging request at virtual address 5ffffc1b
[5ffffc1b] *pgd=00000000
Internal error: Oops: 801 [#1] PREEMPT
Modules linked in: ...
CPU: 0    Tainted: G         C   (3.0.0-rc2-00006-gff5f4d6-dirty #68)
PC is at irq_gc_mask_clr_bit+0x38/0x40
LR is at gpio_irq_handler+0x44/0xdc
pc : [<c0d6f3a4>]    lr : [<c0d29a74>]    psr: 60000093
sp : c10abe68  ip : 00000001  fp : c10abe74
r10: 00000000  r9 : c10b69d0  r8 : 00000001
r7 : fec67010  r6 : 0000ffff  r5 : 00000038  r4 : 00000038
r3 : 0000001c  r2 : 00000400  r1 : 5ffffbff  r0 : c70050f0
Flags: nZCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
Control: 0005317f  Table: 85cfc000  DAC: 00000017
Process swapper (pid: 0, stack limit = 0xc10aa270)
Stack: (0xc10abe68 to 0xc10ac000)
be60:                   c10abeac c10abe78 c0d29a74 c0d6f37c c0d3c028 c0d2c79c
be80: 00000000 c10c0b80 00000038 00000000 00000002 00000001 c10aa000 00000000
bea0: c10abebc c10abeb0 c0d6c0d8 c0d29a40 c10abedc c10abec0 c0d1e038 c0d6c0b4
bec0: 60000013 ffffffff fec48000 60000013 c10abf8c c10abee0 c0d1eb4c c0d1e010
bee0: 00000001 00000000 0075287d 00000000 c10b52e0 c10b52e0 60000013 60000013
bf00: ffff9214 c10b4508 00000000 c10abf8c c10abec0 c10abf28 c0d56068 c0d610a4
bf20: 60000013 ffffffff 00000002 c0d20e24 c0d20e44 00000004 4f482f80 ffff920b
bf40: 055d4a80 00000000 4f6b9d83 00000004 c10b0d00 60000013 4f6b9d83 00000004
bf60: 00000000 c10aa000 c10cc2c4 c10b0514 c10b0698 80004000 41069265 80021e74
bf80: c10abfac c10abf90 c0d2003c c0d60dc8 00000002 c10cc220 c0d1924c c11dc480
bfa0: c10abfc4 c10abfb0 c0fd10fc c0d20014 00000000 c10ac8f4 c10abff4 c10abfc8
bfc0: c00089c4 c0fd1088 c00083d4 00000000 00000000 c0d1924c 00053175 c10ac010
bfe0: c0d19248 c10b050c 00000000 c10abff8 8000803c c0008740 00000000 00000000
Backtrace:
[<c0d6f36c>] (irq_gc_mask_clr_bit+0x0/0x40) from [<c0d29a74>]
(gpio_irq_handler+0x44/0xdc)
[<c0d29a30>] (gpio_irq_handler+0x0/0xdc) from [<c0d6c0d8>]
(generic_handle_irq+0x34/0x48)
[<c0d6c0a4>] (generic_handle_irq+0x0/0x48) from [<c0d1e038>]
(asm_do_IRQ+0x38/0x8c)
[<c0d1e000>] (asm_do_IRQ+0x0/0x8c) from [<c0d1eb4c>] (__irq_svc+0x4c/0x90)