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author | Ohad Ben-Cohen <ohad@wizery.com> | 2012-07-02 08:41:16 (GMT) |
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committer | Ohad Ben-Cohen <ohad@wizery.com> | 2012-07-05 21:53:25 (GMT) |
commit | c6b5a27628faf6657b741d828a1462d832d0dbc5 (patch) | |
tree | 3f5bcb10c6d2b1e395330536476d471415632832 /drivers/remoteproc/remoteproc_core.c | |
parent | 7183a2a799b81490354973117ecd810c23cdc668 (diff) | |
download | linux-c6b5a27628faf6657b741d828a1462d832d0dbc5.tar.xz |
remoteproc: simplify unregister/free interfaces
Simplify the unregister/free interfaces, and make them easier
to understand and use, by moving to a symmetric and consistent
alloc() -> register() -> unregister() -> free() flow.
To create and register an rproc instance, one needed to invoke
rproc_alloc() followed by rproc_register().
To unregister and free an rproc instance, one now needs to invoke
rproc_unregister() followed by rproc_free().
Cc: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Diffstat (limited to 'drivers/remoteproc/remoteproc_core.c')
-rw-r--r-- | drivers/remoteproc/remoteproc_core.c | 25 |
1 files changed, 8 insertions, 17 deletions
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c index aa713aa..4a77dc1 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); |