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authorSudeep Holla <sudeep.holla@arm.com>2017-03-21 11:30:15 +0000
committerJassi Brar <jaswinder.singh@linaro.org>2017-04-27 16:20:04 +0530
commitcc6eeaa3029a6dbcb4ad41b1f92876483bd88965 (patch)
tree802adbab75077e90751f4c59ecf8ffaabc4c2737 /drivers/mailbox
parentc61b781ee084e69855477d23dd33e7e6caad652c (diff)
downloadop-kernel-dev-cc6eeaa3029a6dbcb4ad41b1f92876483bd88965.zip
op-kernel-dev-cc6eeaa3029a6dbcb4ad41b1f92876483bd88965.tar.gz
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 <alexey.klimov@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
Diffstat (limited to 'drivers/mailbox')
-rw-r--r--drivers/mailbox/mailbox.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c
index 28a34cf..49e5dad 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);
}
}
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