topic Re: kernel Panic in imx6 in i.MX Processors

kernel Panic in imx6

mathew_k_t — Fri, 11 May 2018 11:19:50 GMT

Hi,

I'm using iMX6ULL custom board. In my application, I read data from two AFE4490 and iMX6 reads data registers after the ADC_READY interrupt(pulse width 0.24us). I configured ADC_READY pins as gpio-keys. In ISR, it generates a uevent as below

static void gpio_keys_gpio_work_func(struct work_struct *work)
{
   struct gpio_button_data *bdata =container_of(work, struct gpio_button_data, work.work);
   char *envp[2];
   char state_buf[10];

   if (bdata->irq == 36) {
       snprintf(state_buf, sizeof(state_buf),"STATE=%s", "1");
       envp[0] = state_buf;

       envp[1] = NULL;
       kobject_uevent_env(&bdata->input->dev.kobj, KOBJ_ONLINE, envp);
   }
}

iMX6 generates interrupts on ADC_READY signal.

1. But i'm not getting any events at userspace. What's the issue in the configuration?

2. After 30 minutes, kernel panic occurs due to out of Memory issue. How to clear uevent buffer?

Best Regards

Re: kernel Panic in imx6

igorpadykov — Mon, 21 May 2018 02:30:40 GMT

Hi mathew_k_t

one can try to decrease frequency of interrupt signal, make ISR as short as possible

and further debug it using AN4553 Using Open Source Debugging Tools for Linux on i.MX Processors
https://www.nxp.com/docs/en/application-note/AN4553.pdf

Best regards
igor
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Re: kernel Panic in imx6

mathew_k_t — Mon, 21 May 2018 03:27:41 GMT

Hi,

Thank you Igor for your response.

We cannot reduce frequency of interrupt signal, this much samples are necessary for our application.

Could you suggest an idea to clear uevent buffer(to avoid out of memory issue)