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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>
This commit is contained in:
Manu Abraham 2010-02-13 17:06:14 -03:00 committed by Mauro Carvalho Chehab
parent 5817ea0c83
commit c8382c8e32
1 changed files with 9 additions and 0 deletions
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9
drivers/media/dvb/frontends/stv090x.c
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@ -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);