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thermal: convert devfreq_cooling to use an IDA

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thermal devfreq cooling does not use the ability to look up pointers by
ID, so convert it from using an IDR to the more space-efficient IDA.

Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
This commit is contained in:
Matthew Wilcox 2016-12-21 09:47:06 -08:00 committed by Zhang Rui
parent ae60608962
commit 2f96c035fb
1 changed files with 9 additions and 44 deletions
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53
drivers/thermal/devfreq_cooling.c
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@ -21,14 +21,14 @@
#include <linux/devfreq.h>
#include <linux/devfreq_cooling.h>
#include <linux/export.h>
#include <linux/idr.h>
#include <linux/slab.h>
#include <linux/pm_opp.h>
#include <linux/thermal.h>
#include <trace/events/thermal.h>
static DEFINE_MUTEX(devfreq_lock);
static DEFINE_IDR(devfreq_idr);
static DEFINE_IDA(devfreq_ida);
/**
* struct devfreq_cooling_device - Devfreq cooling device
@ -57,42 +57,6 @@ struct devfreq_cooling_device {
struct devfreq_cooling_power *power_ops;
};
/**
* get_idr - function to get a unique id.
* @idr: struct idr * handle used to create a id.
* @id: int * value generated by this function.
*
* This function will populate @id with an unique
* id, using the idr API.
*
* Return: 0 on success, an error code on failure.
*/
static int get_idr(struct idr *idr, int *id)
{
int ret;
mutex_lock(&devfreq_lock);
ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL);
mutex_unlock(&devfreq_lock);
if (unlikely(ret < 0))
return ret;
*id = ret;
return 0;
}
/**
* release_idr - function to free the unique id.
* @idr: struct idr * handle used for creating the id.
* @id: int value representing the unique id.
*/
static void release_idr(struct idr *idr, int id)
{
mutex_lock(&devfreq_lock);
idr_remove(idr, id);
mutex_unlock(&devfreq_lock);
}
/**
* partition_enable_opps() - disable all opps above a given state
* @dfc: Pointer to devfreq we are operating on
@ -496,9 +460,10 @@ of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df,
if (err)
goto free_dfc;
err = get_idr(&devfreq_idr, &dfc->id);
if (err)
err = ida_simple_get(&devfreq_ida, 0, 0, GFP_KERNEL);
if (err < 0)
goto free_tables;
dfc->id = err;
snprintf(dev_name, sizeof(dev_name), "thermal-devfreq-%d", dfc->id);
@ -509,15 +474,15 @@ of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df,
dev_err(df->dev.parent,
"Failed to register devfreq cooling device (%d)\n",
err);
goto release_idr;
goto release_ida;
}
dfc->cdev = cdev;
return cdev;
release_idr:
release_idr(&devfreq_idr, dfc->id);
release_ida:
ida_simple_remove(&devfreq_ida, dfc->id);
free_tables:
kfree(dfc->power_table);
kfree(dfc->freq_table);
@ -565,7 +530,7 @@ void devfreq_cooling_unregister(struct thermal_cooling_device *cdev)
dfc = cdev->devdata;
thermal_cooling_device_unregister(dfc->cdev);
release_idr(&devfreq_idr, dfc->id);
ida_simple_remove(&devfreq_ida, dfc->id);
kfree(dfc->power_table);
kfree(dfc->freq_table);