gpiolib: Fix line event handling in syscall compatible mode

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The introduced line event handling ABI in the commit

  61f922db72 ("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: 61f922db72 ("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>

...

This commit is contained in:

Andy Shevchenko 2020-09-15 15:58:16 +03:00 • committed by Bartosz Golaszewski

parent 1b02d9e770

commit 5ad284ab3a

1 changed files with 30 additions and 4 deletions

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drivers/gpio/gpiolib-cdev.c

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