[help] kernel oops in function gpio_to_irq

[Matthias Brugger]

El 27/03/2013 18:16, "Mylene Josserand" <Mylene.Josserand at navocap.com> va
escriure:
>
> Hi everyone,
>
>
> I have a problem with gpio functions.
> My kernel version is 3.8.2 and my SoC is a imX27 on a "home-made" board.
>
> First, when I boot, I had only the "Starting kernel..." message.
> So I rebuild my kernel with CONFIG_DEBUG_KERNEL, CONFIG_DEBUG_LL and
> CONFIG_EARLY_PRINTK. I have also add the line
> "earlyprintk=console,UART0,115200" on the bootargs of my Barebox.
>
> With that, I can see more messages :
>
> [...]
> Unable to handle kernel NULL pointer dereference at virtual address
0000002c
> pgd = c0004000
> [0000002c] *pgd=00000000
> Internal error: Oops: 5 [#1] PREEMPT ARM
> Modules linked in:
> CPU: 0    Not tainted  (3.8.2+ #4)
> PC is at __gpio_to_irq+0x1c/0x44
> LR is at navocap_baseboard_init+0xd8/0x2c8
> pc : [<c01fd194>]    lr : [<c04fd468>]    psr: 60000053
> sp : c7835ef0  ip : 00000079  fp : c05a5628
> r10: c04f817c  r9 : 00000000  r8 : c05a562c
> r7 : c7834000  r6 : 00000004  r5 : c05158c4  r4 : c0578844
> r3 : 000005ac  r2 : c05b0410  r1 : c7834000  r0 : 00000000
> Flags: nZCv  IRQs on  FIQs off  Mode SVC_32  ISA ARM  Segment kernel
> Control: 0005317f  Table: a0004000  DAC: 00000017
> Process swapper (pid: 1, stack limit = 0xc78341b8)
> Stack: (0xc7835ef0 to 0xc7836000)
> 5ee0:                                     c05158c4 c04fd468 00000002
> 10009000
> 5f00: 10009fff 00000000 00000200 00000000 00000000 00000000 c05158c4
> c04fd348
> 5f20: c0578844 c04f819c c04d23dc c00087f8 00000003 00000003 c04d1b2c
> c06bd6a0
> 5f40: 00000000 c0578844 c05158c4 00000004 0000008b c05a562c c0515898
> c04f6378
> 5f60: c05a5620 c04f62a0 00000003 00000003 c04f6378 c00403e0 00000000
> 00000000
> 5f80: c03cfee0 00000000 00000000 00000000 00000000 00000000 00000000
> c03cfeec
> 5fa0: 00000000 00000000 c03cfee0 c00093b0 00000000 00000000 00000000
> 00000000
> 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> 00000000
> 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00100000
> 000a1000
> [<c01fd194>] (__gpio_to_irq+0x1c/0x44) from [<c04fd468>]
> (navocap_baseboard_init+0xd8/0x2c8)
> [<c04fd468>] (navocap_baseboard_init+0xd8/0x2c8) from [<c04f819c>]
> (customize_machine+0x20/0x30)
> [<c04f819c>] (customize_machine+0x20/0x30) from [<c00087f8>]
> (do_one_initcall+0x2c/0x168)
> [<c00087f8>] (do_one_initcall+0x2c/0x168) from [<c04f62a0>]
> (kernel_init_freeable+0xf4/0x1cc)
> [<c04f62a0>] (kernel_init_freeable+0xf4/0x1cc) from [<c03cfeec>]
> (kernel_init+0xc/0x164)
> [<c03cfeec>] (kernel_init+0xc/0x164) from [<c00093b0>]
> (ret_from_fork+0x14/0x24)
> Code: e0433100 e1a0c000 e7920003 e24dd004 (e590302c)
> ---[ end trace 61bb09c25216d85b ]---
> Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
>
>
> The problem is in the function "gpio_to_irq" in my board init functions
> (navocap_baseboard_init).
>
> To know which lines the opps appears, I have followed this tutorial :
> https://wiki.ubuntu.com/Kernel/KernelDebuggingTricks
>
> Thanks to it, I can notice that the opps appears when I called the
> "gpio_to_irq" function in :
>
> ret = request_irq(gpio_to_irq(IMX_GPIO_NR(2,14)), detect_irq,
> IRQF_TRIGGER_FALLING, "imx-mmc-detect", data);

Make sure your arguments are not NULL (IMX_GPIO_NR, detect_irq and data).

Some extra printk's before calling request_irq should do.

>
>
> I have checked in other boards how to use this function and it is
> configured in the same way.
> I did see where I have made a mistake. Maybe in my config file where I
> have missed a configuration option ? How to solve this opps problem ? It
> would be very great if someone could give me some helps / feedbacks on
> this problem.
>
> Thank you in advance !
>
> Best regards,
>
>
> --
> Mylène JOSSERAND
> Navocap
>
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