• Ohad Ben-Cohen's avatar
    rpmsg: make sure inflight messages don't invoke just-removed callbacks · 15fd943a
    Ohad Ben-Cohen authored
    When inbound messages arrive, rpmsg core looks up their associated
    endpoint (by destination address) and then invokes their callback.
    
    We've made sure that endpoints will never be de-allocated after they
    were found by rpmsg core, but we also need to protect against the
    (rare) scenario where the rpmsg driver was just removed, and its
    callback function isn't available anymore.
    
    This is achieved by introducing a callback mutex, which must be taken
    before the callback is invoked, and, obviously, before it is removed.
    
    Cc: stable <stable@vger.kernel.org>
    Reported-by: default avatarFernando Guzman Lugo <fernando.lugo@ti.com>
    Signed-off-by: default avatarOhad Ben-Cohen <ohad@wizery.com>
    15fd943a
rpmsg.h 11.4 KB