linux-kernel - [PATCH 4.4 29/91] mailbox: always wait in mbox_send

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Date:   Fri,  4 Aug 2017 16:15:25 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alexey Klimov <alexey.klimov@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Amit Pundir <amit.pundir@...aro.org>
Subject: [PATCH 4.4 29/91] mailbox: always wait in mbox_send_message for blocking Tx mode

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sudeep Holla <sudeep.holla@....com>

commit c61b781ee084e69855477d23dd33e7e6caad652c upstream.

There exists a race when msg_submit return immediately as there was an
active request being processed which may have completed just before it's
checked again in mbox_send_message. This will result in return to the
caller without waiting in mbox_send_message even when it's blocking Tx.

This patch fixes the issue by waiting for the completion always if Tx
is in blocking mode.

Fixes: 2b6d83e2b8b7 ("mailbox: Introduce framework for mailbox")
Reported-by: Alexey Klimov <alexey.klimov@....com>
Signed-off-by: Sudeep Holla <sudeep.holla@....com>
Reviewed-by: Alexey Klimov <alexey.klimov@....com>
Signed-off-by: Jassi Brar <jaswinder.singh@...aro.org>
Signed-off-by: Amit Pundir <amit.pundir@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mailbox/mailbox.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/mailbox/mailbox.c
+++ b/drivers/mailbox/mailbox.c
@@ -261,7 +261,7 @@ int mbox_send_message(struct mbox_chan *
 
 	msg_submit(chan);
 
-	if (chan->cl->tx_block && chan->active_req) {
+	if (chan->cl->tx_block) {
 		unsigned long wait;
 		int ret;