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    Subject[PATCH 5.13 788/800] mailbox: qcom-ipcc: Fix IPCC mbox channel exhaustion
    Date
    From: Sibi Sankar <sibis@codeaurora.org>

    commit d6fbfdbc12745ce24bcd348dbf7e652353b3e59c upstream.

    Fix IPCC (Inter-Processor Communication Controller) channel exhaustion by
    setting the channel private data to NULL on mbox shutdown.

    Err Logs:
    remoteproc: MBA booted without debug policy, loading mpss
    remoteproc: glink-edge: failed to acquire IPC channel
    remoteproc: failed to probe subdevices for remoteproc: -16

    Fixes: fa74a0257f45 ("mailbox: Add support for Qualcomm IPCC")
    Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
    Cc: stable@vger.kernel.org
    Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
    Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
    Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/mailbox/qcom-ipcc.c | 6 ++++++
    1 file changed, 6 insertions(+)

    --- a/drivers/mailbox/qcom-ipcc.c
    +++ b/drivers/mailbox/qcom-ipcc.c
    @@ -155,6 +155,11 @@ static int qcom_ipcc_mbox_send_data(stru
    return 0;
    }

    +static void qcom_ipcc_mbox_shutdown(struct mbox_chan *chan)
    +{
    + chan->con_priv = NULL;
    +}
    +
    static struct mbox_chan *qcom_ipcc_mbox_xlate(struct mbox_controller *mbox,
    const struct of_phandle_args *ph)
    {
    @@ -184,6 +189,7 @@ static struct mbox_chan *qcom_ipcc_mbox_

    static const struct mbox_chan_ops ipcc_mbox_chan_ops = {
    .send_data = qcom_ipcc_mbox_send_data,
    + .shutdown = qcom_ipcc_mbox_shutdown,
    };

    static int qcom_ipcc_setup_mbox(struct qcom_ipcc *ipcc)

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