mirror of
https://github.com/torvalds/linux.git
synced 2024-11-28 07:01:32 +00:00
d359992070
These changes fix the argument to the kcalloc
@n: number of elements.
@size: element size.
@flags: the type of memory to allocate (see kmalloc).
void *kcalloc(size_t n, size_t size, gfp_t flags)
Fixes: 3c5445ce3a (cpufreq: OPP: Avoid sleeping while atomic)
Signed-off-by: Anand Moon <moon.linux@yahoo.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
111 lines
3.1 KiB
C
111 lines
3.1 KiB
C
/*
|
|
* Generic OPP helper interface for CPUFreq drivers
|
|
*
|
|
* Copyright (C) 2009-2014 Texas Instruments Incorporated.
|
|
* Nishanth Menon
|
|
* Romit Dasgupta
|
|
* Kevin Hilman
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/cpufreq.h>
|
|
#include <linux/device.h>
|
|
#include <linux/err.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/export.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/pm_opp.h>
|
|
#include <linux/rcupdate.h>
|
|
#include <linux/slab.h>
|
|
|
|
/**
|
|
* dev_pm_opp_init_cpufreq_table() - create a cpufreq table for a device
|
|
* @dev: device for which we do this operation
|
|
* @table: Cpufreq table returned back to caller
|
|
*
|
|
* Generate a cpufreq table for a provided device- this assumes that the
|
|
* opp list is already initialized and ready for usage.
|
|
*
|
|
* This function allocates required memory for the cpufreq table. It is
|
|
* expected that the caller does the required maintenance such as freeing
|
|
* the table as required.
|
|
*
|
|
* Returns -EINVAL for bad pointers, -ENODEV if the device is not found, -ENOMEM
|
|
* if no memory available for the operation (table is not populated), returns 0
|
|
* if successful and table is populated.
|
|
*
|
|
* WARNING: It is important for the callers to ensure refreshing their copy of
|
|
* the table if any of the mentioned functions have been invoked in the interim.
|
|
*
|
|
* Locking: The internal device_opp and opp structures are RCU protected.
|
|
* Since we just use the regular accessor functions to access the internal data
|
|
* structures, we use RCU read lock inside this function. As a result, users of
|
|
* this function DONOT need to use explicit locks for invoking.
|
|
*/
|
|
int dev_pm_opp_init_cpufreq_table(struct device *dev,
|
|
struct cpufreq_frequency_table **table)
|
|
{
|
|
struct dev_pm_opp *opp;
|
|
struct cpufreq_frequency_table *freq_table = NULL;
|
|
int i, max_opps, ret = 0;
|
|
unsigned long rate;
|
|
|
|
rcu_read_lock();
|
|
|
|
max_opps = dev_pm_opp_get_opp_count(dev);
|
|
if (max_opps <= 0) {
|
|
ret = max_opps ? max_opps : -ENODATA;
|
|
goto out;
|
|
}
|
|
|
|
freq_table = kcalloc((max_opps + 1), sizeof(*freq_table), GFP_ATOMIC);
|
|
if (!freq_table) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0, rate = 0; i < max_opps; i++, rate++) {
|
|
/* find next rate */
|
|
opp = dev_pm_opp_find_freq_ceil(dev, &rate);
|
|
if (IS_ERR(opp)) {
|
|
ret = PTR_ERR(opp);
|
|
goto out;
|
|
}
|
|
freq_table[i].driver_data = i;
|
|
freq_table[i].frequency = rate / 1000;
|
|
}
|
|
|
|
freq_table[i].driver_data = i;
|
|
freq_table[i].frequency = CPUFREQ_TABLE_END;
|
|
|
|
*table = &freq_table[0];
|
|
|
|
out:
|
|
rcu_read_unlock();
|
|
if (ret)
|
|
kfree(freq_table);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_opp_init_cpufreq_table);
|
|
|
|
/**
|
|
* dev_pm_opp_free_cpufreq_table() - free the cpufreq table
|
|
* @dev: device for which we do this operation
|
|
* @table: table to free
|
|
*
|
|
* Free up the table allocated by dev_pm_opp_init_cpufreq_table
|
|
*/
|
|
void dev_pm_opp_free_cpufreq_table(struct device *dev,
|
|
struct cpufreq_frequency_table **table)
|
|
{
|
|
if (!table)
|
|
return;
|
|
|
|
kfree(*table);
|
|
*table = NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_opp_free_cpufreq_table);
|