interconnect: qcom: rpm: Prevent integer overflow in rate
authorStephan Gerhold <stephan@gerhold.net>
Mon, 6 Dec 2021 11:45:42 +0000 (12:45 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 27 Jan 2022 10:05:00 +0000 (11:05 +0100)
commitd90d496a999ed1e7909e8e24f452c0b7b444a636
tree2ffeb921739caf24bfe6c70a402bb690a274845e
parentefd507bed1b4ba0f32ece009c34e462392e6de7c
interconnect: qcom: rpm: Prevent integer overflow in rate

[ Upstream commit a7d9436a6c85fcb8843c910fd323dcd7f839bf63 ]

Using icc-rpm on ARM32 currently results in clk_set_rate() errors during
boot, e.g. "bus clk_set_rate error: -22". This is very similar to commit
7381e27b1e56 ("interconnect: qcom: msm8974: Prevent integer overflow in rate")
where the u64 is converted to a signed long during clock rate rounding,
resulting in an overflow on 32-bit platforms.

Let's fix it similarly by making sure that the rate does not exceed
LONG_MAX. Such high clock rates will surely result in the maximum
frequency of the bus anyway.

Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Link: https://lore.kernel.org/r/20211206114542.45325-1-stephan@gerhold.net
Signed-off-by: Georgi Djakov <djakov@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/interconnect/qcom/icc-rpm.c