This is a note to let you know that I've just added the patch titled interconnect: qcom: rpm: Prevent integer overflow in rate to the 5.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: interconnect-qcom-rpm-prevent-integer-overflow-in-ra.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit d18d7f794c2cc37c7b064f948aa778919f8219d6 Author: Stephan Gerhold <stephan@xxxxxxxxxxx> Date: Mon Dec 6 12:45:42 2021 +0100 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@xxxxxxxxxxx> Link: https://lore.kernel.org/r/20211206114542.45325-1-stephan@xxxxxxxxxxx Signed-off-by: Georgi Djakov <djakov@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/interconnect/qcom/icc-rpm.c b/drivers/interconnect/qcom/icc-rpm.c index 54de49ca7808a..ddf1805ded0c0 100644 --- a/drivers/interconnect/qcom/icc-rpm.c +++ b/drivers/interconnect/qcom/icc-rpm.c @@ -68,6 +68,7 @@ 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;