V4L/DVB: stv090x: Add some notes about the internal tuner I/O control

Signed-off-by: Manu Abraham <manu@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/dvb/frontends/stv090x.c b/drivers/media/dvb/frontends/stv090x.c
index a461fdf..425e7a4 100644 (file)
--- a/drivers/media/dvb/frontends/stv090x.c
+++ b/drivers/media/dvb/frontends/stv090x.c
@@ -758,6 +758,15 @@ 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);