Re: [PATCH v3] gpiolib: Fix line event handling in syscall compatible mode

[Kent Gibson <warthog618@xxxxxxxxx>]

On Tue, Sep 15, 2020 at 03:58:16PM +0300, Andy Shevchenko wrote:
> The introduced line event handling ABI in the commit
> 
>   61f922db7221 ("gpio: userspace ABI for reading GPIO line events")
> 
> missed the fact that 64-bit kernel may serve for 32-bit applications.
> In such case the very first check in the lineevent_read() will fail
> due to alignment differences.
> 
> To workaround this introduce lineevent_get_size() helper which returns actual
> size of the structure in user space.
> 
> Fixes: 61f922db7221 ("gpio: userspace ABI for reading GPIO line events")
> Suggested-by: Arnd Bergmann <arnd@xxxxxxxx>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> Acked-by: Arnd Bergmann <arnd@xxxxxxxx>

Tested-by: Kent Gibson <warthog618@xxxxxxxxx>