media: cec: fix the Signal Free Time calculation
commit 7d867a1b765e2b70815fec4964d7822a976ed349 upstream.
The calculation of the Signal Free Time in the framework was not
correct. If a message was received, then the next transmit should be
considered a New Initiator and use a shorter SFT value.
This was not done with the result that if both sides where continually
sending messages, they both could use the same SFT value and one side
could deny the other side access to the bus.
Note that this fix does not take the corner case into account where
a receive is in progress when you call adap_transmit.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Cc: <stable@vger.kernel.org> # for v4.18 and up
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/include/media/cec.h b/include/media/cec.h
index 603f2fa..9b7394a 100644
--- a/include/media/cec.h
+++ b/include/media/cec.h
@@ -63,7 +63,6 @@
struct delayed_work work;
struct completion c;
u8 attempts;
- bool new_initiator;
bool blocking;
bool completed;
};
@@ -174,6 +173,7 @@
bool is_configuring;
bool is_configured;
bool cec_pin_is_high;
+ u8 last_initiator;
u32 monitor_all_cnt;
u32 monitor_pin_cnt;
u32 follower_cnt;