[media] si2165: avoid division by zero
When si2165_init fails, the clk values in state are still at zero.
But the dvb-core ignores the return value of init will call tune
afterwards.
This will trigger a division by zero when tuning.
At least check for the variables to be non-zero before dividing.
This happened for a system with WinTV HVR-4400 PCIe-card after suspend-to-disk.
Do suspend-to-disk without accessing the DVB device before.
After wakeup try to tune.
si2165_init fails at checking the chip_mode and aborts.
Then si2165_set_if_freq_shift will fail with div-by-zero.
Signed-off-by: Matthias Schwarzott <zzam@gentoo.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
diff --git a/drivers/media/dvb-frontends/si2165.c b/drivers/media/dvb-frontends/si2165.c
index 8bf716a..849c3c4 100644
--- a/drivers/media/dvb-frontends/si2165.c
+++ b/drivers/media/dvb-frontends/si2165.c
@@ -751,6 +751,9 @@
u64 oversamp;
u32 reg_value;
+ if (!dvb_rate)
+ return -EINVAL;
+
oversamp = si2165_get_fe_clk(state);
oversamp <<= 23;
do_div(oversamp, dvb_rate);
@@ -775,6 +778,9 @@
return -EINVAL;
}
+ if (!fe_clk)
+ return -EINVAL;
+
fe->ops.tuner_ops.get_if_frequency(fe, &IF);
if_freq_shift = IF;
if_freq_shift <<= 29;