From: Antti Palosaari <crope@iki.fi>
Date: Tue, 14 Apr 2015 18:12:54 +0000 (-0300)
Subject: [media] dvb-core: fix 32-bit overflow during bandwidth calculation
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=2a80f296422a01178d0a993479369e94f5830127;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

[media] dvb-core: fix 32-bit overflow during bandwidth calculation

Frontend bandwidth calculation overflows on very high DVB-S/S2
symbol rates. Use mult_frac() macro in order to keep calculation
correct.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
---

diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c
index 882ca417f328..a894d4c99ee8 100644
--- a/drivers/media/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb-core/dvb_frontend.c
@@ -2216,7 +2216,7 @@ static int dtv_set_frontend(struct dvb_frontend *fe)
 		break;
 	}
 	if (rolloff)
-		c->bandwidth_hz = (c->symbol_rate * rolloff) / 100;
+		c->bandwidth_hz = mult_frac(c->symbol_rate, rolloff, 100);
 
 	/* force auto frequency inversion if requested */
 	if (dvb_force_auto_inversion)