From: Sudeep Holla <sudeep.holla@arm.com>
Date: Tue, 21 Mar 2017 11:30:14 +0000 (+0000)
Subject: mailbox: always wait in mbox_send_message for blocking Tx mode
X-Git-Tag: C0P2-H0.0--20200415~7979
X-Git-Url: https://git.somdevices.com/?a=commitdiff_plain;h=a23fba8182039d7162d6b19c9030a414f43f7f62;p=linux.git

mailbox: always wait in mbox_send_message for blocking Tx mode

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@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Reviewed-by: Alexey Klimov <alexey.klimov@arm.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c
index 4a36632c236f..e9e6d6672967 100644
--- a/drivers/mailbox/mailbox.c
+++ b/drivers/mailbox/mailbox.c
@@ -261,7 +261,7 @@ int mbox_send_message(struct mbox_chan *chan, void *mssg)
 
 	msg_submit(chan);
 
-	if (chan->cl->tx_block && chan->active_req) {
+	if (chan->cl->tx_block) {
 		unsigned long wait;
 		int ret;