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reset: use kref for reference counting

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Use kref for reference counting and enjoy the advantages of refcount_t.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
This commit is contained in:
Philipp Zabel 2017-05-31 17:42:29 +02:00
parent cae285ea12
commit d25e4334c2
1 changed files with 18 additions and 11 deletions
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29
drivers/reset/core.c
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@ -13,6 +13,7 @@
#include <linux/err.h> #include <linux/err.h>
#include <linux/export.h> #include <linux/export.h>
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/kref.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/of.h> #include <linux/of.h>
#include <linux/reset.h> #include <linux/reset.h>
@ -40,7 +41,7 @@ struct reset_control {
struct reset_controller_dev *rcdev; struct reset_controller_dev *rcdev;
struct list_head list; struct list_head list;
unsigned int id; unsigned int id;
unsigned int refcnt; struct kref refcnt;
bool shared; bool shared;
atomic_t deassert_count; atomic_t deassert_count;
atomic_t triggered_count; atomic_t triggered_count;
@ -288,7 +289,7 @@ static struct reset_control *__reset_control_get_internal(
if (WARN_ON(!rstc->shared || !shared)) if (WARN_ON(!rstc->shared || !shared))
return ERR_PTR(-EBUSY); return ERR_PTR(-EBUSY);
rstc->refcnt++; kref_get(&rstc->refcnt);
return rstc; return rstc;
} }
} }
@ -302,23 +303,30 @@ static struct reset_control *__reset_control_get_internal(
rstc->rcdev = rcdev; rstc->rcdev = rcdev;
list_add(&rstc->list, &rcdev->reset_control_head); list_add(&rstc->list, &rcdev->reset_control_head);
rstc->id = index; rstc->id = index;
rstc->refcnt = 1; kref_init(&rstc->refcnt);
rstc->shared = shared; rstc->shared = shared;
return rstc; return rstc;
} }
static void __reset_control_release(struct kref *kref)
{
struct reset_control *rstc = container_of(kref, struct reset_control,
refcnt);
lockdep_assert_held(&reset_list_mutex);
module_put(rstc->rcdev->owner);
list_del(&rstc->list);
kfree(rstc);
}
static void __reset_control_put_internal(struct reset_control *rstc) static void __reset_control_put_internal(struct reset_control *rstc)
{ {
lockdep_assert_held(&reset_list_mutex); lockdep_assert_held(&reset_list_mutex);
if (--rstc->refcnt) kref_put(&rstc->refcnt, __reset_control_release);
return;
module_put(rstc->rcdev->owner);
list_del(&rstc->list);
kfree(rstc);
} }
struct reset_control *__of_reset_control_get(struct device_node *node, struct reset_control *__of_reset_control_get(struct device_node *node,
@ -400,7 +408,6 @@ EXPORT_SYMBOL_GPL(__reset_control_get);
* reset_control_put - free the reset controller * reset_control_put - free the reset controller
* @rstc: reset controller * @rstc: reset controller
*/ */
void reset_control_put(struct reset_control *rstc) void reset_control_put(struct reset_control *rstc)
{ {
if (IS_ERR_OR_NULL(rstc)) if (IS_ERR_OR_NULL(rstc))