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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: a9e3fbfaa0 ("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>
This commit is contained in:
Sudeep Holla 2023-11-30 20:43:42 +00:00
parent b85ea95d08
commit 8e3c98d918
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/firmware/arm_scmi/perf.c
View File

@ -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);
}