[media] drxd: fix divide error (f8a26f05) · Commits · 戴 / test

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:

drivers/media/dvb/frontends/drxd_hard.c

+9 −4

Original line number	Diff line number	Diff line
		@@ -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;
		}