It looks like you are calling rtdm_dev_register twice, so the second
one complains that it already exists. Take out the second call and
see what happens.
// rtdm_sem_init(&sem, 0); // init the global semaphore
rtdm_printk("gpio TRY register Driver \n");
err=rtdm_dev_register(&device);
if ((err=rtdm_dev_register(&device))!=0){
// gpio_free(GPIO_PIN);
rtdm_printk("err number = %d\n",err);
if(err == -EINVAL)
rtdm_printk("err EINVAL = %d\n",err);
if(err == -EEXIST)
rtdm_printk("err EEXIST = %d\n",err);
if(err == -ENOMEM)
rtdm_printk("err ENOMEM = %d\n",err);
if(err == -EAGAIN)
rtdm_printk("err EAGAIN = %d\n",err);
if(err == -ENOSYS)
rtdm_printk("err ENOSYS = %d\n",err);
if(err == -ENXIO)
rtdm_printk("err ENXIO = %d\n",err);
kfree(&device);
return err;
}
-Greg
On Wed, May 2, 2018 at 4:42 AM, Шевченко Тарас Григорьевич
<shevchenko.ta...@triolcorp.com.ua> wrote:
> HI Community
> I try to register simple rtdm gpio driver
>
> but get the error EEXIST ? could you explain what is wrong or missing ?
> and what daes it mean "invalid opcode: 0000 [#1] SMP" ?
>
> [ 1415.642644] gpio Driver Init
> [ 1415.642646] gpio TRY register Driver
> [ 1415.642881] err number = -17
> [ 1415.642885] err EEXIST = -17
> [ 1415.642922] ------------[ cut here ]------------
> [ 1415.643010] kernel BUG at mm/slub.c:3873!
> [ 1415.643066] invalid opcode: 0000 [#1] SMP
>
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