diff options
Diffstat (limited to 'drivers/net/wireless/realtek/rtw89/util.h')
| -rw-r--r-- | drivers/net/wireless/realtek/rtw89/util.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/net/wireless/realtek/rtw89/util.h b/drivers/net/wireless/realtek/rtw89/util.h index 229e81009de6..1ae80b7561da 100644 --- a/drivers/net/wireless/realtek/rtw89/util.h +++ b/drivers/net/wireless/realtek/rtw89/util.h @@ -14,4 +14,34 @@ #define rtw89_for_each_rtwvif(rtwdev, rtwvif) \ list_for_each_entry(rtwvif, &(rtwdev)->rtwvifs_list, list) +/* The result of negative dividend and positive divisor is undefined, but it + * should be one case of round-down or round-up. So, make it round-down if the + * result is round-up. + * Note: the maximum value of divisor is 0x7FFF_FFFF, because we cast it to + * signed value to make compiler to use signed divide instruction. + */ +static inline s32 s32_div_u32_round_down(s32 dividend, u32 divisor, s32 *remainder) +{ + s32 i_divisor = (s32)divisor; + s32 i_remainder; + s32 quotient; + + quotient = dividend / i_divisor; + i_remainder = dividend % i_divisor; + + if (i_remainder < 0) { + quotient--; + i_remainder += i_divisor; + } + + if (remainder) + *remainder = i_remainder; + return quotient; +} + +static inline s32 s32_div_u32_round_closest(s32 dividend, u32 divisor) +{ + return s32_div_u32_round_down(dividend + divisor / 2, divisor, NULL); +} + #endif |