[media] drxd: fix divide error

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 <ejsheldrake@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

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 2238bf0be959..bcad01ca1a13 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;
                 }