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

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Date:   Wed, 16 Jun 2021 23:12:58 +0530
From:   Sibi Sankar <sibis@...eaurora.org>
To:     bjorn.andersson@...aro.org, jassisinghbrar@...il.com,
        manivannan.sadhasivam@...aro.org
Cc:     agross@...nel.org, rananta@...eaurora.org, vnkgutta@...eaurora.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Sibi Sankar <sibis@...eaurora.org>, stable@...r.kernel.org
Subject: [PATCH] mailbox: qcom-ipcc: Fix IPCC mbox channel exhaustion

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
---
 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)
-- 
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a Linux Foundation Collaborative Project