gpiolib: Fix line event handling in syscall compatible mode
The introduced line event handling ABI in the commit 61f922db ("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: 61f922db ("gpio: userspace ABI for reading GPIO line events") Suggested-by:Arnd Bergmann <arnd@arndb.de> Signed-off-by:
Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by:
Arnd Bergmann <arnd@arndb.de> Tested-by:
Kent Gibson <warthog618@gmail.com> Signed-off-by:
Bartosz Golaszewski <bgolaszewski@baylibre.com>
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