Commit 8272d0a0 authored by Malcolm Priestley's avatar Malcolm Priestley Committed by Mauro Carvalho Chehab
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[media] m88rs2000: prevent frontend crash on continuous transponder scans 



Add m88rs2000_get_tune_settings, min delay of 2000 ms on symbol
rate more than 3000000 and delay of 3000ms less than this.

Adding min delay prevents crashing the frontend on continuous
transponder scans. Other dvb_frontend_tune_settings remain as default.

This makes very little time difference to good channel scans, but slows down
the set frontend where lock can never be achieved i.e. DVB-S2.

Signed-off-by: default avatarMalcolm Priestley <tvboxspy@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarMichael Krufky <mkrufky@linuxtv.org>
Signed-off-by: default avatarMauro Carvalho Chehab <m.chehab@samsung.com>
parent 3c8023a7

drivers/media/dvb-frontends/m88rs2000.c

+17 −0
Original line number Diff line number Diff line
@@ -715,6 +715,22 @@ static int m88rs2000_get_frontend(struct dvb_frontend *fe) 
	return 0;

}



static int m88rs2000_get_tune_settings(struct dvb_frontend *fe,

	struct dvb_frontend_tune_settings *tune)

{

	struct dtv_frontend_properties *c = &fe->dtv_property_cache;



	if (c->symbol_rate > 3000000)

		tune->min_delay_ms = 2000;

	else

		tune->min_delay_ms = 3000;



	tune->step_size = c->symbol_rate / 16000;

	tune->max_drift = c->symbol_rate / 2000;



	return 0;

}



static int m88rs2000_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)

{

	struct m88rs2000_state *state = fe->demodulator_priv;
@@ -766,6 +782,7 @@ static struct dvb_frontend_ops m88rs2000_ops = { 


	.set_frontend = m88rs2000_set_frontend,

	.get_frontend = m88rs2000_get_frontend,

	.get_tune_settings = m88rs2000_get_tune_settings,

};



struct dvb_frontend *m88rs2000_attach(const struct m88rs2000_config *config,