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media: cxd2841er: fix 64-bit division on gcc-9

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[ Upstream commit 8d46603eeeb4c6abff1d2e49f2a6ae289dac765e ]

It appears that do_div() once more gets confused by a complex
expression that ends up not quite being constant despite
__builtin_constant_p() thinking it is:

ERROR: modpost: "__aeabi_uldivmod" [drivers/media/dvb-frontends/cxd2841er.ko] undefined!

Use div_u64() instead, forcing the expression to be evaluated
first, and making it a bit more readable.

Cc: Dan Carpenter <dan.carpenter@linaro.org>
Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Closes: https://lore.kernel.org/linux-media/CA+G9fYvvNm-aYodLaAwwTjEGtX0YxR-1R14FOA5aHKt0sSVsYg@mail.gmail.com/
Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
Closes: https://lore.kernel.org/linux-media/CA+G9fYvvNm-aYodLaAwwTjEGtX0YxR-1R14FOA5aHKt0sSVsYg@mail.gmail.com/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
[hverkuil: added Closes tags]
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Arnd Bergmann 2024-11-11 11:41:42 +01:00 • committed by Greg Kroah-Hartman
commit dde407d931
1 changed files with 2 additions and 6 deletions
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8
drivers/media/dvb-frontends/cxd2841er.c
View file

@ -310,12 +310,8 @@ static int cxd2841er_set_reg_bits(struct cxd2841er_priv *priv,
static u32 cxd2841er_calc_iffreq_xtal(enum cxd2841er_xtal xtal, u32 ifhz)
{
u64 tmp;
tmp = (u64) ifhz * 16777216;
do_div(tmp, ((xtal == SONY_XTAL_24000) ? 48000000 : 41000000));
return (u32) tmp;
return div_u64(ifhz * 16777216ull,
(xtal == SONY_XTAL_24000) ? 48000000 : 41000000);
}
static u32 cxd2841er_calc_iffreq(u32 ifhz)