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drivers: soc: qcom: rimps_memlat: check cpu in idle path

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In the idle notification, driver saves the mon pmu events
to pmu cache memory. Current implementation loops through
all the monitors in the group without checking if the given
cpu is present in the mon cpumask or not. If the cpu is not
present in mon cpumask, the macro to_mon_ev_data in
save_mon_pmu_events function can return a wrong address
to mon_data which can result in crash.

Check if cpu is present in mon cpumask before storing the mon
pmu events.

Change-Id: Ia2d674fab401dd83f7ce7410607aa4a665851871
Signed-off-by: Santosh Mardi <gsantosh@codeaurora.org>
This commit is contained in:
Santosh Mardi 2021-01-30 01:39:37 +05:30 • committed by Gerrit - the friendly Code Review server
commit c90efd1d2a
1 changed files with 3 additions and 1 deletions
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4
drivers/soc/qcom/rimps_memlat.c
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@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2013 - 2020, The Linux Foundation. All rights reserved.
* Copyright (c) 2013 - 2021, The Linux Foundation. All rights reserved.
*/
#define pr_fmt(fmt) "rimps-memlat: " fmt
@ -848,6 +848,8 @@ static int memlat_idle_notif(struct notifier_block *nb,
save_cpugrp_pmu_events(cpu_grp, cpu);
for (i = 0; i < cpu_grp->num_mons; i++) {
mon = &cpu_grp->mons[i];
if (!cpumask_test_cpu(cpu, &mon->cpus))
continue;
save_mon_pmu_events(mon, cpu);
}
set_pmu_cache_flag(PMU_CACHE_VALID, cpu);