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block, badblocks: introduce devm_init_badblocks

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Provide a devres interface for initializing a badblocks instance.  The
pmem driver has several scenarios where it will be beneficial to have
this structure automatically freed when the device is disabled / fails
probe.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2016-01-04 23:50:23 -08:00
parent 20a308f09e
commit 16263ff6c7
2 changed files with 49 additions and 15 deletions
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50
block/badblocks.c
View File

@ -17,6 +17,7 @@
#include <linux/badblocks.h>
#include <linux/seqlock.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/stddef.h>
@ -522,6 +523,28 @@ ssize_t badblocks_store(struct badblocks *bb, const char *page, size_t len,
}
EXPORT_SYMBOL_GPL(badblocks_store);
static int __badblocks_init(struct device *dev, struct badblocks *bb,
int enable)
{
bb->dev = dev;
bb->count = 0;
if (enable)
bb->shift = 0;
else
bb->shift = -1;
if (dev)
bb->page = devm_kzalloc(dev, PAGE_SIZE, GFP_KERNEL);
else
bb->page = kzalloc(PAGE_SIZE, GFP_KERNEL);
if (!bb->page) {
bb->shift = -1;
return -ENOMEM;
}
seqlock_init(&bb->lock);
return 0;
}
/**
* badblocks_init() - initialize the badblocks structure
* @bb: the badblocks structure that holds all badblock information
@ -533,22 +556,18 @@ EXPORT_SYMBOL_GPL(badblocks_store);
*/
int badblocks_init(struct badblocks *bb, int enable)
{
bb->count = 0;
if (enable)
bb->shift = 0;
else
bb->shift = -1;
bb->page = kzalloc(PAGE_SIZE, GFP_KERNEL);
if (bb->page == (u64 *)0) {
bb->shift = -1;
return -ENOMEM;
}
seqlock_init(&bb->lock);
return 0;
return __badblocks_init(NULL, bb, enable);
}
EXPORT_SYMBOL_GPL(badblocks_init);
int devm_init_badblocks(struct device *dev, struct badblocks *bb)
{
if (!bb)
return -EINVAL;
return __badblocks_init(dev, bb, 1);
}
EXPORT_SYMBOL_GPL(devm_init_badblocks);
/**
* badblocks_exit() - free the badblocks structure
* @bb: the badblocks structure that holds all badblock information
@ -557,7 +576,10 @@ void badblocks_exit(struct badblocks *bb)
{
if (!bb)
return;
kfree(bb->page);
if (bb->dev)
devm_kfree(bb->dev, bb->page);
else
kfree(bb->page);
bb->page = NULL;
}
EXPORT_SYMBOL_GPL(badblocks_exit);

14
include/linux/badblocks.h
View File

@ -2,6 +2,7 @@
#define _LINUX_BADBLOCKS_H
#include <linux/seqlock.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/stddef.h>
#include <linux/types.h>
@ -23,6 +24,7 @@
#define MAX_BADBLOCKS (PAGE_SIZE/8)
struct badblocks {
struct device *dev; /* set by devm_init_badblocks */
int count; /* count of bad blocks */
int unacked_exist; /* there probably are unacknowledged
* bad blocks. This is only cleared
@ -49,5 +51,15 @@ ssize_t badblocks_store(struct badblocks *bb, const char *page, size_t len,
int unack);
int badblocks_init(struct badblocks *bb, int enable);
void badblocks_exit(struct badblocks *bb);
struct device;
int devm_init_badblocks(struct device *dev, struct badblocks *bb);
static inline void devm_exit_badblocks(struct device *dev, struct badblocks *bb)
{
if (bb->dev != dev) {
dev_WARN_ONCE(dev, 1, "%s: badblocks instance not associated\n",
__func__);
return;
}
badblocks_exit(bb);
}
#endif