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cpufreq: qcom-cpufreq-hw: Avoid stack buffer for IRQ name

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Registering an IRQ requires the string buffer containing the name to
remain allocated, as the name is not copied into another buffer.

So let's add a irq_name field to the data struct instead, which is
guaranteed to have the appropriate lifetime.

Cc: Thara Gopinath <thara.gopinath@linaro.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Andy Gross <agross@kernel.org>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Thara Gopinath <thara.gopinath@linaro.org>
Tested-by: Steev Klimaszewski <steev@kali.org>
Signed-off-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Ard Biesheuvel 2021-11-11 17:48:06 +02:00 committed by Viresh Kumar
parent 7e97b3dc25
commit be6592ed56
1 changed files with 4 additions and 4 deletions
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8
drivers/cpufreq/qcom-cpufreq-hw.c
View file

@ -46,6 +46,7 @@ struct qcom_cpufreq_data {
*/
struct mutex throttle_lock;
int throttle_irq;
char irq_name[15];
bool cancel_throttle;
struct delayed_work throttle_work;
struct cpufreq_policy *policy;
@ -367,7 +368,6 @@ static int qcom_cpufreq_hw_lmh_init(struct cpufreq_policy *policy, int index)
{
struct qcom_cpufreq_data *data = policy->driver_data;
struct platform_device *pdev = cpufreq_get_driver_data();
char irq_name[15];
int ret;
/*
@ -384,11 +384,11 @@ static int qcom_cpufreq_hw_lmh_init(struct cpufreq_policy *policy, int index)
mutex_init(&data->throttle_lock);
INIT_DEFERRABLE_WORK(&data->throttle_work, qcom_lmh_dcvs_poll);
snprintf(irq_name, sizeof(irq_name), "dcvsh-irq-%u", policy->cpu);
snprintf(data->irq_name, sizeof(data->irq_name), "dcvsh-irq-%u", policy->cpu);
ret = request_threaded_irq(data->throttle_irq, NULL, qcom_lmh_dcvs_handle_irq,
IRQF_ONESHOT, irq_name, data);
IRQF_ONESHOT, data->irq_name, data);
if (ret) {
dev_err(&pdev->dev, "Error registering %s: %d\n", irq_name, ret);
dev_err(&pdev->dev, "Error registering %s: %d\n", data->irq_name, ret);
return 0;
}