Messages in this thread Patch in this message | | | From | Lukasz Luba <> | Subject | [PATCH v8 06/23] PM: EM: Check if the get_cost() callback is present in em_compute_costs() | Date | Thu, 8 Feb 2024 11:55:40 +0000 |
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Subsequent changes will introduce a case in which 'cb->get_cost' may not be set in em_compute_costs(), so add a check to ensure that it is not NULL before attempting to dereference it.
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com> Tested-by: Dietmar Eggemann <dietmar.eggemann@arm.com> Signed-off-by: Lukasz Luba <lukasz.luba@arm.com> --- kernel/power/energy_model.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c index 5c47caaf270e..21d761223255 100644 --- a/kernel/power/energy_model.c +++ b/kernel/power/energy_model.c @@ -116,7 +116,7 @@ static int em_compute_costs(struct device *dev, struct em_perf_state *table, for (i = nr_states - 1; i >= 0; i--) { unsigned long power_res, cost; - if (flags & EM_PERF_DOMAIN_ARTIFICIAL) { + if ((flags & EM_PERF_DOMAIN_ARTIFICIAL) && cb->get_cost) { ret = cb->get_cost(dev, table[i].frequency, &cost); if (ret || !cost || cost > EM_MAX_POWER) { dev_err(dev, "EM: invalid cost %lu %d\n", -- 2.25.1
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