firmware: arm_scmi: Fix frequency truncation by promoting multiplier type

Fix the possible frequency truncation for all values equal to or greater
4GHz on 64bit machines by updating the multiplier 'mult_factor' to
'unsigned long' type. It is also possible that the multiplier itself can
be greater than or equal to 2^32. So we need to also fix the equation
computing the value of the multiplier.

Fixes: a9e3fbfaa0ff ("firmware: arm_scmi: add initial support for performance protocol")
Reported-by: Sibi Sankar <quic_sibis@quicinc.com>
Closes: https://lore.kernel.org/all/20231129065748.19871-3-quic_sibis@quicinc.com/
Cc: Cristian Marussi <cristian.marussi@arm.com>
Link: https://lore.kernel.org/r/20231130204343.503076-1-sudeep.holla@arm.com
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c
index c2435be0ae1be851b58fafef7242fc54bcf43774..f98791274495e566d7d2403bff1949ed6815abfd 100644 (file)
--- a/drivers/firmware/arm_scmi/perf.c
+++ b/drivers/firmware/arm_scmi/perf.c
@@ -152,7 +152,7 @@ struct perf_dom_info {
        u32 opp_count;
        u32 sustained_freq_khz;
        u32 sustained_perf_level;
-       u32 mult_factor;
+       unsigned long mult_factor;
        struct scmi_perf_domain_info info;
        struct scmi_opp opp[MAX_OPPS];
        struct scmi_fc_info *fc_info;
@@ -273,8 +273,8 @@ scmi_perf_domain_attributes_get(const struct scmi_protocol_handle *ph,
                        dom_info->mult_factor = 1000;
                else
                        dom_info->mult_factor =
-                                       (dom_info->sustained_freq_khz * 1000) /
-                                       dom_info->sustained_perf_level;
+                                       (dom_info->sustained_freq_khz * 1000UL)
+                                       / dom_info->sustained_perf_level;
                strscpy(dom_info->info.name, attr->name,
                        SCMI_SHORT_NAME_MAX_SIZE);
        }