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-rw-r--r--Documentation/remoteproc.txt21
-rw-r--r--drivers/remoteproc/omap_remoteproc.c5
-rw-r--r--drivers/remoteproc/remoteproc_core.c25
3 files changed, 20 insertions, 31 deletions
diff --git a/Documentation/remoteproc.txt b/Documentation/remoteproc.txt
index 70a048cd3fa3..ad6ded4bca5c 100644
--- a/Documentation/remoteproc.txt
+++ b/Documentation/remoteproc.txt
@@ -120,14 +120,14 @@ int dummy_rproc_example(struct rproc *my_rproc)
On success, the new rproc is returned, and on failure, NULL.
Note: _never_ directly deallocate @rproc, even if it was not registered
- yet. Instead, if you just need to unroll rproc_alloc(), use rproc_free().
+ yet. Instead, when you need to unroll rproc_alloc(), use rproc_free().
void rproc_free(struct rproc *rproc)
- Free an rproc handle that was allocated by rproc_alloc.
- This function should _only_ be used if @rproc was only allocated,
- but not registered yet.
- If @rproc was already successfully registered (by calling
- rproc_register()), then use rproc_unregister() instead.
+ This function essentially unrolls rproc_alloc(), by decrementing the
+ rproc's refcount. It doesn't directly free rproc; that would happen
+ only if there are no other references to rproc and its refcount now
+ dropped to zero.
int rproc_register(struct rproc *rproc)
- Register @rproc with the remoteproc framework, after it has been
@@ -143,19 +143,14 @@ int dummy_rproc_example(struct rproc *my_rproc)
probed.
int rproc_unregister(struct rproc *rproc)
- - Unregister a remote processor, and decrement its refcount.
- If its refcount drops to zero, then @rproc will be freed. If not,
- it will be freed later once the last reference is dropped.
-
+ - Unroll rproc_register().
This function should be called when the platform specific rproc
implementation decides to remove the rproc device. it should
_only_ be called if a previous invocation of rproc_register()
has completed successfully.
- After rproc_unregister() returns, @rproc is _not_ valid anymore and
- it shouldn't be used. More specifically, don't call rproc_free()
- or try to directly free @rproc after rproc_unregister() returns;
- none of these are needed, and calling them is a bug.
+ After rproc_unregister() returns, @rproc is still valid, and its
+ last refcount should be decremented by calling rproc_free().
Returns 0 on success and -EINVAL if @rproc isn't valid.
diff --git a/drivers/remoteproc/omap_remoteproc.c b/drivers/remoteproc/omap_remoteproc.c
index b5e6d2981741..4f2fe8fd7fe6 100644
--- a/drivers/remoteproc/omap_remoteproc.c
+++ b/drivers/remoteproc/omap_remoteproc.c
@@ -214,7 +214,10 @@ static int __devexit omap_rproc_remove(struct platform_device *pdev)
{
struct rproc *rproc = platform_get_drvdata(pdev);
- return rproc_unregister(rproc);
+ rproc_unregister(rproc);
+ rproc_free(rproc);
+
+ return 0;
}
static struct platform_driver omap_rproc_driver = {
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index aa713aade30e..4a77dc1df3d8 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1472,7 +1472,7 @@ static struct device_type rproc_type = {
* On success the new rproc is returned, and on failure, NULL.
*
* Note: _never_ directly deallocate @rproc, even if it was not registered
- * yet. Instead, if you just need to unroll rproc_alloc(), use rproc_free().
+ * yet. Instead, when you need to unroll rproc_alloc(), use rproc_free().
*/
struct rproc *rproc_alloc(struct device *dev, const char *name,
const struct rproc_ops *ops,
@@ -1526,14 +1526,13 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
EXPORT_SYMBOL(rproc_alloc);
/**
- * rproc_free() - free an rproc handle that was allocated by rproc_alloc
+ * rproc_free() - unroll rproc_alloc()
* @rproc: the remote processor handle
*
- * This function should _only_ be used if @rproc was only allocated,
- * but not registered yet.
+ * This function decrements the rproc dev refcount.
*
- * If @rproc was already successfully registered (by calling rproc_register()),
- * then use rproc_unregister() instead.
+ * If no one holds any reference to rproc anymore, then its refcount would
+ * now drop to zero, and it would be freed.
*/
void rproc_free(struct rproc *rproc)
{
@@ -1545,19 +1544,14 @@ EXPORT_SYMBOL(rproc_free);
* rproc_unregister() - unregister a remote processor
* @rproc: rproc handle to unregister
*
- * Unregisters a remote processor, and decrements its refcount.
- * If its refcount drops to zero, then @rproc will be freed. If not,
- * it will be freed later once the last reference is dropped.
- *
* This function should be called when the platform specific rproc
* implementation decides to remove the rproc device. it should
* _only_ be called if a previous invocation of rproc_register()
* has completed successfully.
*
- * After rproc_unregister() returns, @rproc is _not_ valid anymore and
- * it shouldn't be used. More specifically, don't call rproc_free()
- * or try to directly free @rproc after rproc_unregister() returns;
- * none of these are needed, and calling them is a bug.
+ * After rproc_unregister() returns, @rproc isn't freed yet, because
+ * of the outstanding reference created by rproc_alloc. To decrement that
+ * one last refcount, one still needs to call rproc_free().
*
* Returns 0 on success and -EINVAL if @rproc isn't valid.
*/
@@ -1580,9 +1574,6 @@ int rproc_unregister(struct rproc *rproc)
device_del(&rproc->dev);
- /* unroll rproc_alloc. TODO: we may want to let the users do that */
- put_device(&rproc->dev);
-
return 0;
}
EXPORT_SYMBOL(rproc_unregister);

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