linux-kernel - [PATCH 4.14 25/36] rpmsg: glink: Free pending deferred work on remove

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Message-Id: <20191219182917.324506203@linuxfoundation.org>
Date:   Thu, 19 Dec 2019 19:34:42 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Chris Lew <clew@...eaurora.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: [PATCH 4.14 25/36] rpmsg: glink: Free pending deferred work on remove

From: Bjorn Andersson <bjorn.andersson@...aro.org>

commit 278bcb7300f61785dba63840bd2a8cf79f14554c upstream.

By just cancelling the deferred rx worker during GLINK instance teardown
any pending deferred commands are leaked, so free them.

Fixes: b4f8e52b89f6 ("rpmsg: Introduce Qualcomm RPM glink driver")
Cc: stable@...r.kernel.org
Acked-by: Chris Lew <clew@...eaurora.org>
Tested-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/rpmsg/qcom_glink_native.c |   14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

--- a/drivers/rpmsg/qcom_glink_native.c
+++ b/drivers/rpmsg/qcom_glink_native.c
@@ -1539,6 +1539,18 @@ static void qcom_glink_work(struct work_
 	}
 }
 
+static void qcom_glink_cancel_rx_work(struct qcom_glink *glink)
+{
+	struct glink_defer_cmd *dcmd;
+	struct glink_defer_cmd *tmp;
+
+	/* cancel any pending deferred rx_work */
+	cancel_work_sync(&glink->rx_work);
+
+	list_for_each_entry_safe(dcmd, tmp, &glink->rx_queue, node)
+		kfree(dcmd);
+}
+
 struct qcom_glink *qcom_glink_native_probe(struct device *dev,
 					   unsigned long features,
 					   struct qcom_glink_pipe *rx,
@@ -1611,7 +1623,7 @@ void qcom_glink_native_remove(struct qco
 	int ret;
 
 	disable_irq(glink->irq);
-	cancel_work_sync(&glink->rx_work);
+	qcom_glink_cancel_rx_work(glink);
 
 	ret = device_for_each_child(glink->dev, NULL, qcom_glink_remove_device);
 	if (ret)