interconnect: qcom: rpm: Prevent integer overflow in rate

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
7179eba99ad3 ("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>

diff --git a/drivers/interconnect/qcom/icc-rpm.c b/drivers/interconnect/qcom/icc-rpm.c
index 35888721a690e1ea1e632a965c061bcabf724076..6fa56c930bd159de90ecd4e541f46f870e2b026a 100644 (file)
--- a/drivers/interconnect/qcom/icc-rpm.c
+++ b/drivers/interconnect/qcom/icc-rpm.c
@@ -239,6 +239,7 @@ static int qcom_icc_set(struct icc_node *src, struct icc_node *dst)
        rate = max(sum_bw, max_peak_bw);
 
        do_div(rate, qn->buswidth);
+       rate = min_t(u64, rate, LONG_MAX);
 
        if (qn->rate == rate)
                return 0;