devlink: add devl guard

JIRA: https://issues.redhat.com/browse/RHEL-75600

Upstream commit(s):
commit 0502bd2
Author: Konrad Knitter <[email protected]>
Date:   Wed Nov 6 10:36:42 2024 +0100

    devlink: add devl guard

    Add devl guard for scoped_guard().

    Example usage:

    scoped_guard(devl, priv_to_devlink(pf)) {
            err = init_devlink(pf);
            if (err)
                    return err;
    }

    Co-developed-by: Przemek Kitszel <[email protected]>
    Signed-off-by: Przemek Kitszel <[email protected]>
    Signed-off-by: Konrad Knitter <[email protected]>
    Tested-by: Pucha Himasekhar Reddy <[email protected]> (A Contingent worker at Intel)
    Signed-off-by: Tony Nguyen <[email protected]>

Signed-off-by: Petr Oros <[email protected]>

Author: orosp

include/net/devlink.h

@@ -1563,6 +1563,7 @@ int devl_trylock(struct devlink *devlink);
 void devl_unlock(struct devlink *devlink);
 void devl_assert_locked(struct devlink *devlink);
 bool devl_lock_is_held(struct devlink *devlink);
+DEFINE_GUARD(devl, struct devlink *, devl_lock(_T), devl_unlock(_T));
 
 struct ib_device;