Fix division by zero in drxd triggered by running "femon" before any DVB
tuning has been done (by "scandvb" or anything else).
Signed-off-by: Edward Sheldrake <ejsheldr...@gmail.com>
---
drivers/media/dvb/frontends/drxd_hard.c | 13 +++++++++----
1 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/drivers/media/dvb/frontends/drxd_hard.c
b/drivers/media/dvb/frontends/drxd_hard.c
index 2238bf0..bcad01c 100644
--- a/drivers/media/dvb/frontends/drxd_hard.c
+++ b/drivers/media/dvb/frontends/drxd_hard.c
@@ -889,10 +889,15 @@ static int ReadIFAgc(struct drxd_state *state, u32 *
pValue)
u32 R2 = state->if_agc_cfg.R2;
u32 R3 = state->if_agc_cfg.R3;
- u32 Vmax = (3300 * R2) / (R1 + R2);
- u32 Rpar = (R2 * R3) / (R3 + R2);
- u32 Vmin = (3300 * Rpar) / (R1 + Rpar);
- u32 Vout = Vmin + ((Vmax - Vmin) * Value) / 1024;
+ u32 Vmax, Rpar, Vmin, Vout;
+
+ if (R2 == 0 && (R1 == 0 || R3 == 0))
+ return 0;
+
+ Vmax = (3300 * R2) / (R1 + R2);
+ Rpar = (R2 * R3) / (R3 + R2);
+ Vmin = (3300 * Rpar) / (R1 + Rpar);
+ Vout = Vmin + ((Vmax - Vmin) * Value) / 1024;
*pValue = Vout;
}
--
1.7.6
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