As warned by smatch: drivers/media/dvb-frontends/mb86a16.c:1690 mb86a16_read_ber() error: uninitialized symbol 'timer'. drivers/media/dvb-frontends/mb86a16.c:1706 mb86a16_read_ber() error: uninitialized symbol 'timer'. There is a potential risk of doing a division by zero if timer is not handled well. Enforce it by setting a bit mask for the values used to select the timer. While here, optimize the logic to prevent uneeded tests. Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx> --- drivers/media/dvb-frontends/mb86a16.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/media/dvb-frontends/mb86a16.c b/drivers/media/dvb-frontends/mb86a16.c index f1aad52094c3..5d2bb76bc07a 100644 --- a/drivers/media/dvb-frontends/mb86a16.c +++ b/drivers/media/dvb-frontends/mb86a16.c @@ -1677,15 +1677,15 @@ static int mb86a16_read_ber(struct dvb_frontend *fe, u32 *ber) * the deinterleaver output. * monitored BER is expressed as a 20 bit output in total */ - ber_rst = ber_mon >> 3; + ber_rst = (ber_mon >> 3) & 0x03; *ber = (((ber_msb << 8) | ber_mid) << 8) | ber_lsb; if (ber_rst == 0) timer = 12500000; - if (ber_rst == 1) + else if (ber_rst == 1) timer = 25000000; - if (ber_rst == 2) + else if (ber_rst == 2) timer = 50000000; - if (ber_rst == 3) + else /* ber_rst == 3 */ timer = 100000000; *ber /= timer; @@ -1697,11 +1697,11 @@ static int mb86a16_read_ber(struct dvb_frontend *fe, u32 *ber) * QPSK demodulator output. * monitored BER is expressed as a 24 bit output in total */ - ber_tim = ber_mon >> 1; + ber_tim = (ber_mon >> 1) & 0x01; *ber = (((ber_msb << 8) | ber_mid) << 8) | ber_lsb; if (ber_tim == 0) timer = 16; - if (ber_tim == 1) + else /* ber_tim == 1 */ timer = 24; *ber /= 2 ^ timer; -- 2.13.6
