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remoteproc: remove the now-redundant kref 

Now that every rproc instance contains a device, we don't need a
kref anymore to maintain the refcount of the rproc instances:
that's what device are good with!

This patch removes the now-redundant kref, and switches to
{get, put}_device instead of kref_{get, put}.

We also don't need the kref's release function anymore, and instead,
we just utilize the class's release handler (which is now responsible
for all memory de-allocations).

Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: Fernando Guzman Lugo <fernando.lugo@ti.com>
Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
This commit is contained in:
Ohad Ben-Cohen 2012-05-30 22:02:24 +03:00
parent b5ab5e24e9
commit 7183a2a799
3 changed files with 15 additions and 46 deletions
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50
drivers/remoteproc/remoteproc_core.c
View File

@ -1257,42 +1257,12 @@ out:
}
EXPORT_SYMBOL(rproc_shutdown);
/**
* rproc_release() - completely deletes the existence of a remote processor
* @kref: the rproc's kref
*
* This function should _never_ be called directly.
*
* The only reasonable location to use it is as an argument when kref_put'ing
* @rproc's refcount.
*
* This way it will be called when no one holds a valid pointer to this @rproc
* anymore (and obviously after it is removed from the rprocs klist).
*
* Note: this function is not static because rproc_vdev_release() needs it when
* it decrements @rproc's refcount.
*/
void rproc_release(struct kref *kref)
{
struct rproc *rproc = container_of(kref, struct rproc, refcount);
dev_info(&rproc->dev, "removing %s\n", rproc->name);
rproc_delete_debug_dir(rproc);
/*
* At this point no one holds a reference to rproc anymore,
* so we can directly unroll rproc_alloc()
*/
rproc_free(rproc);
}
/* will be called when an rproc is added to the rprocs klist */
static void klist_rproc_get(struct klist_node *n)
{
struct rproc *rproc = container_of(n, struct rproc, node);
kref_get(&rproc->refcount);
get_device(&rproc->dev);
}
/* will be called when an rproc is removed from the rprocs klist */
@ -1300,7 +1270,7 @@ static void klist_rproc_put(struct klist_node *n)
{
struct rproc *rproc = container_of(n, struct rproc, node);
kref_put(&rproc->refcount, rproc_release);
put_device(&rproc->dev);
}
static struct rproc *next_rproc(struct klist_iter *i)
@ -1342,7 +1312,7 @@ struct rproc *rproc_get_by_name(const char *name)
klist_iter_init(&rprocs, &i);
while ((rproc = next_rproc(&i)) != NULL)
if (!strcmp(rproc->name, name)) {
kref_get(&rproc->refcount);
get_device(&rproc->dev);
break;
}
klist_iter_exit(&i);
@ -1355,7 +1325,7 @@ struct rproc *rproc_get_by_name(const char *name)
ret = rproc_boot(rproc);
if (ret < 0) {
kref_put(&rproc->refcount, rproc_release);
put_device(&rproc->dev);
return NULL;
}
@ -1382,7 +1352,7 @@ void rproc_put(struct rproc *rproc)
rproc_shutdown(rproc);
/* downref rproc's refcount */
kref_put(&rproc->refcount, rproc_release);
put_device(&rproc->dev);
}
EXPORT_SYMBOL(rproc_put);
@ -1463,6 +1433,10 @@ static void rproc_type_release(struct device *dev)
{
struct rproc *rproc = container_of(dev, struct rproc, dev);
dev_info(&rproc->dev, "releasing %s\n", rproc->name);
rproc_delete_debug_dir(rproc);
idr_remove_all(&rproc->notifyids);
idr_destroy(&rproc->notifyids);
@ -1536,8 +1510,6 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
atomic_set(&rproc->power, 0);
kref_init(&rproc->refcount);
mutex_init(&rproc->lock);
idr_init(&rproc->notifyids);
@ -1608,8 +1580,8 @@ int rproc_unregister(struct rproc *rproc)
device_del(&rproc->dev);
/* the rproc will only be released after its refcount drops to zero */
kref_put(&rproc->refcount, rproc_release);
/* unroll rproc_alloc. TODO: we may want to let the users do that */
put_device(&rproc->dev);
return 0;
}

8
drivers/remoteproc/remoteproc_virtio.c
View File

@ -225,7 +225,7 @@ static struct virtio_config_ops rproc_virtio_config_ops = {
/*
* This function is called whenever vdev is released, and is responsible
* to decrement the remote processor's refcount taken when vdev was
* to decrement the remote processor's refcount which was taken when vdev was
* added.
*
* Never call this function directly; it will be called by the driver
@ -240,7 +240,7 @@ static void rproc_vdev_release(struct device *dev)
list_del(&rvdev->node);
kfree(rvdev);
kref_put(&rproc->refcount, rproc_release);
put_device(&rproc->dev);
}
/**
@ -272,11 +272,11 @@ int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
* Therefore we must increment the rproc refcount here, and decrement
* it _only_ when the vdev is released.
*/
kref_get(&rproc->refcount);
get_device(&rproc->dev);
ret = register_virtio_device(vdev);
if (ret) {
kref_put(&rproc->refcount, rproc_release);
put_device(&rproc->dev);
dev_err(dev, "failed to register vdev: %d\n", ret);
goto out;
}

3
include/linux/remoteproc.h
View File

@ -36,7 +36,6 @@
#define REMOTEPROC_H
#include <linux/types.h>
#include <linux/kref.h>
#include <linux/klist.h>
#include <linux/mutex.h>
#include <linux/virtio.h>
@ -370,7 +369,6 @@ enum rproc_state {
* @priv: private data which belongs to the platform-specific rproc module
* @ops: platform-specific start/stop rproc handlers
* @dev: virtual device for refcounting and common remoteproc behavior
* @refcount: refcount of users that have a valid pointer to this rproc
* @power: refcount of users who need this rproc powered up
* @state: state of the device
* @lock: lock which protects concurrent manipulations of the rproc
@ -393,7 +391,6 @@ struct rproc {
void *priv;
const struct rproc_ops *ops;
struct device dev;
struct kref refcount;
atomic_t power;
unsigned int state;
struct mutex lock;