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commitcfe02147e8upstream. The mbox_client for qcom-mpm sends NULL doorbell messages via mbox_send_message() but never signals TX completion. Set knows_txdone=true and call mbox_client_txdone() after a successful send, matching the pattern used by other Qualcomm mailbox clients (smp2p, smsm, qcom_aoss etc). Fixes:a6199bb514"irqchip: Add Qualcomm MPM controller driver" Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com> Signed-off-by: Thomas Gleixner <tglx@kernel.org> Reviewed-by: Douglas Anderson <dianders@chromium.org> Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260322171533.608436-1-jassisinghbrar@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>