From cc6eeaa3029a6dbcb4ad41b1f92876483bd88965 Mon Sep 17 00:00:00 2001 From: Sudeep Holla Date: Tue, 21 Mar 2017 11:30:15 +0000 Subject: [PATCH] mailbox: skip complete wait event if timer expired If a wait_for_completion_timeout() call returns due to a timeout, complete() can get called after returning from the wait which is incorrect and can cause subsequent transmissions on a channel to fail. Since the wait_for_completion_timeout() sees the completion variable is non-zero caused by the erroneous/spurious complete() call, and it immediately returns without waiting for the time as expected by the client. This patch fixes the issue by skipping complete() call for the timer expiry. Fixes: 2b6d83e2b8b7 ("mailbox: Introduce framework for mailbox") Reported-by: Alexey Klimov Signed-off-by: Sudeep Holla Signed-off-by: Jassi Brar --- drivers/mailbox/mailbox.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c index 28a34cf117dc..49e5dadd5733 100644 --- a/drivers/mailbox/mailbox.c +++ b/drivers/mailbox/mailbox.c @@ -107,7 +107,7 @@ static void tx_tick(struct mbox_chan *chan, int r) if (mssg && chan->cl->tx_done) chan->cl->tx_done(chan->cl, mssg, r); - if (chan->cl->tx_block) + if (r != -ETIME && chan->cl->tx_block) complete(&chan->tx_complete); } @@ -271,8 +271,8 @@ int mbox_send_message(struct mbox_chan *chan, void *mssg) ret = wait_for_completion_timeout(&chan->tx_complete, wait); if (ret == 0) { - t = -EIO; - tx_tick(chan, -EIO); + t = -ETIME; + tx_tick(chan, t); } }