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Subject[PATCHv4 4/5] mailbox: Fix TX completion init
Date
From: LeyFoon Tan <lftan.linux@gmail.com>

For fast TX the complete could be called before being initialized as follows
mbox_send_message --> poll_txdone --> tx_tick --> complete(&chan->tx_complete)

Init the completion early enough to fix the race.

Signed-off-by: LeyFoon Tan <lftan.linux@gmail.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
---
drivers/mailbox/mailbox.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c
index 79d576e..cdf7d45 100644
--- a/drivers/mailbox/mailbox.c
+++ b/drivers/mailbox/mailbox.c
@@ -278,6 +278,9 @@ int mbox_send_message(struct mbox_chan *chan, void *mssg)
if (!chan || !chan->cl)
return -EINVAL;

+ if (chan->cl->tx_block)
+ init_completion(&chan->tx_complete);
+
t = _add_to_rbuf(chan, mssg);
if (t < 0) {
pr_err("Try increasing MBOX_TX_QUEUE_LEN\n");
@@ -291,7 +294,6 @@ int mbox_send_message(struct mbox_chan *chan, void *mssg)

if (chan->cl->tx_block && chan->active_req) {
int ret;
- init_completion(&chan->tx_complete);
ret = wait_for_completion_timeout(&chan->tx_complete,
chan->cl->tx_tout);
if (ret == 0) {
--
1.8.1.2


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