[media] fc0011: Add some sanity checks and cleanups

Add some sanity checks to the calculations and make the REG_16 register write consistent
with the other ones.

Signed-off-by: Michael Buesch <m@bues.ch>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/media/tuners/fc0011.c b/drivers/media/tuners/fc0011.c
index f87aa5a8b8ea..3932aa81e18c 100644
--- a/drivers/media/tuners/fc0011.c
+++ b/drivers/media/tuners/fc0011.c
@@ -220,6 +220,7 @@ static int fc0011_set_params(struct dvb_frontend *fe)
 
         /* Calc XIN. The PLL reference frequency is 18 MHz. */
         xdiv = fvco / 18000;
+        WARN_ON(xdiv > 0xFF);
         frac = fvco - xdiv * 18000;
         frac = (frac << 15) / 18000;
         if (frac >= 16384)
@@ -346,6 +347,8 @@ static int fc0011_set_params(struct dvb_frontend *fe)
         vco_cal &= FC11_VCOCAL_VALUEMASK;
 
         switch (vco_sel) {
+        default:
+                WARN_ON(1);
         case 0:
                 if (vco_cal < 8) {
                         regs[FC11_REG_VCOSEL] &= ~(FC11_VCOSEL_1 | FC11_VCOSEL_2);
@@ -427,7 +430,8 @@ static int fc0011_set_params(struct dvb_frontend *fe)
         err = fc0011_writereg(priv, FC11_REG_RCCAL, regs[FC11_REG_RCCAL]);
         if (err)
                 return err;
-        err = fc0011_writereg(priv, FC11_REG_16, 0xB);
+        regs[FC11_REG_16] = 0xB;
+        err = fc0011_writereg(priv, FC11_REG_16, regs[FC11_REG_16]);
         if (err)
                 return err;