[ Upstream commit f72f805e72882c361e2a612c64a6e549f3da7152 ] If child mailbox node status is disabled it causes crash in interrupt handler. Fix this by assigning only available child node during driver probe. Fixes: 4981b82ba2ff ("mailbox: ZynqMP IPI mailbox controller") Signed-off-by: Tanmay Shah <tanmay.shah@amd.com> Acked-by: Michal Simek <michal.simek@amd.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20230311012407.1292118-2-tanmay.shah@amd.com Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Sasha Levin <sashal@kernel.org>