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Subject[PATCH 4.19 27/47] rpmsg: glink: Put an extra reference during cleanup
Date
From: Chris Lew <clew@codeaurora.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@vger.kernel.org
Tested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Chris Lew <clew@codeaurora.org>
Reported-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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);

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