[PATCH for v5.5] cec: check 'transmit_in_progress', not 'transmitting'

[PATCH for v5.5] cec: check 'transmit_in_progress', not 'transmitting'

[Hans Verkuil]

Currently wait_event_interruptible_timeout is called in cec_thread_func()
when adap->transmitting is set. But if the adapter is unconfigured
while transmitting, then adap->transmitting is set to NULL. But the
hardware is still actually transmitting the message, and that's
indicated by adap->transmit_in_progress and we should wait until that
is finished or times out before transmitting new messages.

As the original commit says: adap->transmitting is the userspace view,
adap->transmit_in_progress reflects the hardware state.

However, if adap->transmitting is NULL and adap->transmit_in_progress
is true, then wait_event_interruptible is called (no timeout), which
can get stuck indefinitely if the CEC driver is flaky and never marks
the transmit-in-progress as 'done'.

So test against transmit_in_progress when deciding whether to use
the timeout variant or not, instead of testing against adap->transmitting.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Fixes: 32804fcb612b ("media: cec: keep track of outstanding transmits")
Cc: <stable@vger.kernel.org>      # for v4.19 and up
---
 drivers/media/cec/cec-adap.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/media/cec/cec-adap.c b/drivers/media/cec/cec-adap.c
index d96add70b293..cf251f753b10 100644
--- a/drivers/media/cec/cec-adap.c
+++ b/drivers/media/cec/cec-adap.c
@@ -465,7 +465,7 @@ int cec_thread_func(void *_adap)
 		bool timeout = false;
 		u8 attempts;

-		if (adap->transmitting) {
+		if (adap->transmit_in_progress) {
 			int err;

 			/*
@@ -500,7 +500,7 @@ int cec_thread_func(void *_adap)
 			goto unlock;
 		}

-		if (adap->transmitting && timeout) {
+		if (adap->transmit_in_progress && timeout) {
 			/*
 			 * If we timeout, then log that. Normally this does
 			 * not happen and it is an indication of a faulty CEC
@@ -509,14 +509,18 @@ int cec_thread_func(void *_adap)
 			 * so much traffic on the bus that the adapter was
 			 * unable to transmit for CEC_XFER_TIMEOUT_MS (2.1s).
 			 */
-			pr_warn("cec-%s: message %*ph timed out\n", adap->name,
-				adap->transmitting->msg.len,
-				adap->transmitting->msg.msg);
+			if (adap->transmitting) {
+				pr_warn("cec-%s: message %*ph timed out\n", adap->name,
+					adap->transmitting->msg.len,
+					adap->transmitting->msg.msg);
+				/* Just give up on this. */
+				cec_data_cancel(adap->transmitting,
+						CEC_TX_STATUS_TIMEOUT);
+			} else {
+				pr_warn("cec-%s: transmit timed out\n", adap->name);
+			}
 			adap->transmit_in_progress = false;
 			adap->tx_timeouts++;
-			/* Just give up on this. */
-			cec_data_cancel(adap->transmitting,
-					CEC_TX_STATUS_TIMEOUT);
 			goto unlock;
 		}

-- 
2.23.0