linux-kernel - [PATCH 4.19 27/47] rpmsg: glink: Put an extra reference during cleanup

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Message-Id: <20191219182932.332192007@linuxfoundation.org>
Date:   Thu, 19 Dec 2019 19:34:41 +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,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Chris Lew <clew@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: [PATCH 4.19 27/47] rpmsg: glink: Put an extra reference during cleanup

From: Chris Lew <clew@...eaurora.org>

commit b646293e272816dd0719529dcebbd659de0722f7 upstream.

In a remote processor crash scenario, there is no guarantee the remote
processor sent close requests before it went into a bad state. Remove
the reference that is normally handled by the close command in the
so channel resources can be released.

Fixes: b4f8e52b89f6 ("rpmsg: Introduce Qualcomm RPM glink driver")
Cc: stable@...r.kernel.org
Tested-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Signed-off-by: Chris Lew <clew@...eaurora.org>
Reported-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 |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/rpmsg/qcom_glink_native.c
+++ b/drivers/rpmsg/qcom_glink_native.c
@@ -1644,6 +1644,10 @@ void qcom_glink_native_remove(struct qco
 	idr_for_each_entry(&glink->lcids, channel, cid)
 		kref_put(&channel->refcount, qcom_glink_channel_release);
 
+	/* Release any defunct local channels, waiting for close-req */
+	idr_for_each_entry(&glink->rcids, channel, cid)
+		kref_put(&channel->refcount, qcom_glink_channel_release);
+
 	idr_destroy(&glink->lcids);
 	idr_destroy(&glink->rcids);
 	spin_unlock_irqrestore(&glink->idr_lock, flags);