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 4a36632..e9e6d66 100644
--- a/drivers/mailbox/mailbox.c
+++ b/drivers/mailbox/mailbox.c
@@ -261,7 +261,7 @@
msg_submit(chan);
- if (chan->cl->tx_block && chan->active_req) {
+ if (chan->cl->tx_block) {
unsigned long wait;
int ret;