This is a note to let you know that the patch titled
Subject: V4L/DVB: stv090x: Add some notes about the internal tuner I/O
control
Author: Manu Abraham <[email protected]>
Were queued at http://git.linuxtv.org/v4l-dvb.git
Signed-off-by: Manu Abraham <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
drivers/media/dvb/frontends/stv090x.c | 9 +++++++++
1 files changed, 9 insertions(+), 0 deletions(-)
---
http://git.linuxtv.org/v4l-dvb.git?a=commitdiff;h=79348db2df28ba1d387674f1e065b6a661a69ab1
diff --git a/drivers/media/dvb/frontends/stv090x.c
b/drivers/media/dvb/frontends/stv090x.c
index 80b8453..f471995 100644
--- a/drivers/media/dvb/frontends/stv090x.c
+++ b/drivers/media/dvb/frontends/stv090x.c
@@ -757,6 +757,15 @@ static int stv090x_i2c_gate_ctrl(struct stv090x_state
*state, int enable)
{
u32 reg;
+ /*
+ * NOTE! A lock is used as a FSM to control the state in which
+ * access is serialized between two tuners on the same demod.
+ * This has nothing to do with a lock to protect a critical section
+ * which may in some other cases be confused with protecting I/O
+ * access to the demodulator gate.
+ * In case of any error, the lock is unlocked and exit within the
+ * relevant operations themselves.
+ */
if (enable)
mutex_lock(&state->internal->tuner_lock);
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