• Johannes Berg's avatar
    rfkill: prep for rfkill API changes · 1be491fc
    Johannes Berg authored
    
    
    We've designed the /dev/rfkill API in a way that we
    can increase the event struct by adding members at
    the end, should it become necessary. To validate the
    events, userspace and the kernel need to have the
    proper event size to check for -- when reading from
    the other end they need to verify that it's at least
    version 1 of the event API, with the current struct
    size, so define a constant for that and make the
    code a little more 'future proof'.
    
    Not that I expect that we'll have to change the event
    size any time soon, but it's better to write the code
    in a way that lends itself to extending.
    
    Due to the current size of the event struct, the code
    is currently equivalent, but should the event struct
    ever need to be increased the new code might not need
    changing.
    Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
    Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
    1be491fc