[PATCH V1 1/6] rpmsg: glink: fix destroy channel endpoint logic

[Deepak Kumar Singh <deesin@codeaurora.org>]

From: Konstantin Dorfman <kdorfman@codeaurora.org>

When rpmsg client driver destroys last channel endpoint, remove rpmsg
device is triggered. In both cases (destroy endpoint and remove device)
a glink close command sent to the remote peer.

This change, when for removing rpmsg device endpoint already destroyed
will avoid sending second glink close command.

Signed-off-by: Konstantin Dorfman <kdorfman@codeaurora.org>
Signed-off-by: Deepak Kumar Singh <deesin@codeaurora.org>
---
 drivers/rpmsg/qcom_glink_native.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c
index 1995f5b..2668c66 100644
--- a/drivers/rpmsg/qcom_glink_native.c
+++ b/drivers/rpmsg/qcom_glink_native.c
@@ -1210,6 +1210,10 @@ static void qcom_glink_destroy_ept(struct rpmsg_endpoint *ept)
 	unsigned long flags;
 
 	spin_lock_irqsave(&channel->recv_lock, flags);
+	if (!channel->ept.cb) {
+		spin_unlock_irqrestore(&channel->recv_lock, flags);
+		return;
+	}
 	channel->ept.cb = NULL;
 	spin_unlock_irqrestore(&channel->recv_lock, flags);
 
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