Re: NULL pointer dereference when 'rmmod gpio_lynxpoint'

[Mika Westerberg <mika.westerberg@linux.intel.com>]

On Wed, May 11, 2016 at 07:00:18AM -0700, Anatol Pomozov wrote:
>    Hi
>    I tried to read the gpio handling code, but I do not see any obvious
>    reason for this "insert module" crash. And I had no time to do history
>    bisect.
>    On Wed, May 11, 2016 at 2:22 AM, Linus Walleij
>    <[1]linus.walleij@linaro.org> wrote:
> 
>      > I compiled lynx gpio into kernel instead of compiling it as a
>      module.
>      > And the system got more stable - I rebooted my devices ~50 times
>      > already and I do not see the boot problem I had before.
>      'CONFIG_..=y'
>      > definitely makes the situation better.
>      >
>      > As of bisecting - it will require time do find the commit. I might
>      do
>      > it if I find some spare time.
>      If nothing else works I'm happy to accept a patch turning the
>      driver into a bool and removing all module handling code.
> 
>    Before doing this I would love to get some feedback from the driver
>    maintainer. Mathias, do you see this issue with the module?
>    Also I am going to change Arch Linux kernel config to compile this
>    driver as 'y'.

Let's first analyze why it crashes in the first place. Can you give me
detailed instructions how can I reproduce this?