From: LeyFoon Tan <lftan.li...@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.li...@gmail.com>
Signed-off-by: Jassi Brar <jaswinder.si...@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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
