linux-kernel - Re: [PATCH] mailbox: qcom-ipcc: Fix IPCC mbox channel exhaustion

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Date:   Wed, 16 Jun 2021 15:26:37 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Sibi Sankar <sibis@...eaurora.org>
Cc:     jassisinghbrar@...il.com, manivannan.sadhasivam@...aro.org,
        agross@...nel.org, rananta@...eaurora.org, vnkgutta@...eaurora.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH] mailbox: qcom-ipcc: Fix IPCC mbox channel exhaustion

On Wed 16 Jun 12:42 CDT 2021, Sibi Sankar wrote:

> 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@...eaurora.org>
> Cc: stable@...r.kernel.org

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> ---
>  drivers/mailbox/qcom-ipcc.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/mailbox/qcom-ipcc.c b/drivers/mailbox/qcom-ipcc.c
> index 2d13c72944c6..584700cd1585 100644
> --- a/drivers/mailbox/qcom-ipcc.c
> +++ b/drivers/mailbox/qcom-ipcc.c
> @@ -155,6 +155,11 @@ static int qcom_ipcc_mbox_send_data(struct mbox_chan *chan, void *data)
>  	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_xlate(struct mbox_controller *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)
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>