[help] kernel oops in function gpio_to_irq

[Mylene Josserand]

Hi Matthias,


Le 30/03/2013 14:09, Matthias Brugger a écrit :
>
> El 27/03/2013 18:16, "Mylene Josserand" <Mylene.Josserand at navocap.com
> <mailto: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.


Thank you very much for your help !
I will try that.

>
>  >
>  >
>  > 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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>

Best regards,

-- 
Mylène JOSSERAND
Navocap