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| author | Dan Gopstein <dgopstein@nyu.edu> | 2017-12-26 00:16:14 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2018-03-06 12:08:17 +0300 |
| commit | 7aa92c4229fefff0cab6930cf977f4a0e3e606d8 (patch) | |
| tree | 31f5e43b03e4837db5eff1dc04ed477d2bfdaf43 /drivers/media/dvb-frontends/mb86a16.c | |
| parent | 62474660fb2d92bb3f419769912517cccac2cf96 (diff) | |
| download | linux-7aa92c4229fefff0cab6930cf977f4a0e3e606d8.tar.xz | |
media: ABS macro parameter parenthesization
Replace usages of the locally defined ABS() macro with calls to the
canonical abs() from kernel.h and remove the old definitions of ABS()
This change was originally motivated by two local definitions of the
ABS (absolute value) macro that fail to parenthesize their parameter
properly. This can lead to a bad expansion for low-precedence
expression arguments.
For example: ABS(1-2) currently expands to ((1-2) < 0 ? (-1-2) : (1-2))
which evaluates to -3. But the correct expansion would be
((1-2) < 0 ? -(1-2) : (1-2)) which evaluates to 1.
Signed-off-by: Dan Gopstein <dgopstein@nyu.edu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'drivers/media/dvb-frontends/mb86a16.c')
| -rw-r--r-- | drivers/media/dvb-frontends/mb86a16.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/drivers/media/dvb-frontends/mb86a16.c b/drivers/media/dvb-frontends/mb86a16.c index 2969ba6ed9e1..377cd984b069 100644 --- a/drivers/media/dvb-frontends/mb86a16.c +++ b/drivers/media/dvb-frontends/mb86a16.c @@ -31,8 +31,6 @@ static unsigned int verbose = 5; module_param(verbose, int, 0644); -#define ABS(x) ((x) < 0 ? (-x) : (x)) - struct mb86a16_state { struct i2c_adapter *i2c_adap; const struct mb86a16_config *config; @@ -1202,12 +1200,12 @@ static int mb86a16_set_fe(struct mb86a16_state *state) signal_dupl = 0; for (j = 0; j < prev_freq_num; j++) { - if ((ABS(prev_swp_freq[j] - swp_freq)) < (swp_ofs * 3 / 2)) { + if ((abs(prev_swp_freq[j] - swp_freq)) < (swp_ofs * 3 / 2)) { signal_dupl = 1; dprintk(verbose, MB86A16_INFO, 1, "Probably Duplicate Signal, j = %d", j); } } - if ((signal_dupl == 0) && (swp_freq > 0) && (ABS(swp_freq - state->frequency * 1000) < fcp + state->srate / 6)) { + if ((signal_dupl == 0) && (swp_freq > 0) && (abs(swp_freq - state->frequency * 1000) < fcp + state->srate / 6)) { dprintk(verbose, MB86A16_DEBUG, 1, "------ Signal detect ------ [swp_freq=[%07d, srate=%05d]]", swp_freq, state->srate); prev_swp_freq[prev_freq_num] = swp_freq; prev_freq_num++; @@ -1381,7 +1379,7 @@ static int mb86a16_set_fe(struct mb86a16_state *state) dprintk(verbose, MB86A16_INFO, 1, "SWEEP Frequency = %d", swp_freq); swp_freq += delta_freq; dprintk(verbose, MB86A16_INFO, 1, "Adjusting .., DELTA Freq = %d, SWEEP Freq=%d", delta_freq, swp_freq); - if (ABS(state->frequency * 1000 - swp_freq) > 3800) { + if (abs(state->frequency * 1000 - swp_freq) > 3800) { dprintk(verbose, MB86A16_INFO, 1, "NO -- SIGNAL !"); } else { |