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Date: Fri, 29 Jun 2018 11:50:00 -0700
From: Steve Longerbeam <slongerbeam@...il.com>
To: linux-media@...r.kernel.org
Cc: Steve Longerbeam <steve_longerbeam@...tor.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH v5 16/17] media: v4l2: async: Remove notifier subdevs array
All platform drivers have been converted to use
v4l2_async_notifier_add_subdev(), in place of adding
asd's to the notifier subdevs array. So the subdevs
array can now be removed from struct v4l2_async_notifier,
and remove the backward compatibility support for that
array in v4l2-async.c.
Signed-off-by: Steve Longerbeam <steve_longerbeam@...tor.com>
---
drivers/media/v4l2-core/v4l2-async.c | 93 +++++++-----------------------------
include/media/v4l2-async.h | 18 +++----
include/media/v4l2-fwnode.h | 18 ++++---
3 files changed, 32 insertions(+), 97 deletions(-)
diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
index d99ffafb..5c5890e 100644
--- a/drivers/media/v4l2-core/v4l2-async.c
+++ b/drivers/media/v4l2-core/v4l2-async.c
@@ -369,20 +369,12 @@ static bool v4l2_async_notifier_has_async_subdev(
lockdep_assert_held(&list_lock);
/* Check that an asd is not being added more than once. */
- if (notifier->subdevs) {
- for (j = 0; j < this_index; j++) {
- asd_y = notifier->subdevs[j];
- if (asd_equal(asd, asd_y))
- return true;
- }
- } else {
- j = 0;
- list_for_each_entry(asd_y, ¬ifier->asd_list, asd_list) {
- if (j++ >= this_index)
- break;
- if (asd_equal(asd, asd_y))
- return true;
- }
+ j = 0;
+ list_for_each_entry(asd_y, ¬ifier->asd_list, asd_list) {
+ if (j++ >= this_index)
+ break;
+ if (asd_equal(asd, asd_y))
+ return true;
}
/* Check that an asd does not exist in other notifiers. */
@@ -435,7 +427,6 @@ static int __v4l2_async_notifier_register(struct v4l2_async_notifier *notifier)
{
struct v4l2_async_subdev *asd;
int ret;
- int i;
if (notifier->num_subdevs > V4L2_MAX_SUBDEVS)
return -EINVAL;
@@ -446,17 +437,8 @@ static int __v4l2_async_notifier_register(struct v4l2_async_notifier *notifier)
__v4l2_async_notifier_init(notifier);
if (!list_empty(¬ifier->asd_list)) {
- /*
- * Caller must have either used v4l2_async_notifier_add_subdev
- * to add asd's to notifier->asd_list, or provided the
- * notifier->subdevs array, but not both.
- */
- if (WARN_ON(notifier->subdevs)) {
- ret = -EINVAL;
- goto err_unlock;
- }
+ unsigned int i = 0;
- i = 0;
list_for_each_entry(asd, ¬ifier->asd_list, asd_list) {
ret = v4l2_async_notifier_asd_valid(notifier, asd, i++);
if (ret)
@@ -464,16 +446,6 @@ static int __v4l2_async_notifier_register(struct v4l2_async_notifier *notifier)
list_add_tail(&asd->list, ¬ifier->waiting);
}
- } else if (notifier->subdevs) {
- for (i = 0; i < notifier->num_subdevs; i++) {
- asd = notifier->subdevs[i];
-
- ret = v4l2_async_notifier_asd_valid(notifier, asd, i);
- if (ret)
- goto err_unlock;
-
- list_add_tail(&asd->list, ¬ifier->waiting);
- }
}
ret = v4l2_async_notifier_try_all_subdevs(notifier);
@@ -566,42 +538,22 @@ EXPORT_SYMBOL(v4l2_async_notifier_unregister);
static void __v4l2_async_notifier_cleanup(struct v4l2_async_notifier *notifier)
{
struct v4l2_async_subdev *asd, *tmp;
- unsigned int i;
- if (!notifier)
+ if (!notifier || !notifier->lists_initialized)
return;
- if (notifier->subdevs) {
- for (i = 0; i < notifier->num_subdevs; i++) {
- asd = notifier->subdevs[i];
-
- switch (asd->match_type) {
- case V4L2_ASYNC_MATCH_FWNODE:
- fwnode_handle_put(asd->match.fwnode);
- break;
- default:
- break;
- }
-
- kfree(asd);
+ list_for_each_entry_safe(asd, tmp,
+ ¬ifier->asd_list, asd_list) {
+ switch (asd->match_type) {
+ case V4L2_ASYNC_MATCH_FWNODE:
+ fwnode_handle_put(asd->match.fwnode);
+ break;
+ default:
+ break;
}
- kvfree(notifier->subdevs);
- notifier->subdevs = NULL;
- } else if (notifier->lists_initialized) {
- list_for_each_entry_safe(asd, tmp,
- ¬ifier->asd_list, asd_list) {
- switch (asd->match_type) {
- case V4L2_ASYNC_MATCH_FWNODE:
- fwnode_handle_put(asd->match.fwnode);
- break;
- default:
- break;
- }
-
- list_del(&asd->asd_list);
- kfree(asd);
- }
+ list_del(&asd->asd_list);
+ kfree(asd);
}
notifier->num_subdevs = 0;
@@ -629,15 +581,6 @@ int v4l2_async_notifier_add_subdev(struct v4l2_async_notifier *notifier,
goto unlock;
}
- /*
- * If caller uses this function, it cannot also allocate and
- * place asd's in the notifier->subdevs array.
- */
- if (WARN_ON(notifier->subdevs)) {
- ret = -EINVAL;
- goto unlock;
- }
-
if (!notifier->lists_initialized)
__v4l2_async_notifier_init(notifier);
diff --git a/include/media/v4l2-async.h b/include/media/v4l2-async.h
index 549b1de..1c00497 100644
--- a/include/media/v4l2-async.h
+++ b/include/media/v4l2-async.h
@@ -124,12 +124,11 @@ struct v4l2_async_notifier_operations {
* struct v4l2_async_notifier - v4l2_device notifier data
*
* @ops: notifier operations
- * @num_subdevs: number of subdevices used in the subdevs array
- * @subdevs: array of pointers to subdevice descriptors
+ * @num_subdevs: number of subdevices in the @asd_list
* @v4l2_dev: v4l2_device of the root notifier, NULL otherwise
* @sd: sub-device that registered the notifier, NULL otherwise
* @parent: parent notifier
- * @asd_list: master list of struct v4l2_async_subdev, replaces @subdevs
+ * @asd_list: master list of struct v4l2_async_subdev
* @waiting: list of struct v4l2_async_subdev, waiting for their drivers
* @done: list of struct v4l2_subdev, already probed
* @list: member in a global list of notifiers
@@ -138,7 +137,6 @@ struct v4l2_async_notifier_operations {
struct v4l2_async_notifier {
const struct v4l2_async_notifier_operations *ops;
unsigned int num_subdevs;
- struct v4l2_async_subdev **subdevs;
struct v4l2_device *v4l2_dev;
struct v4l2_subdev *sd;
struct v4l2_async_notifier *parent;
@@ -156,10 +154,8 @@ struct v4l2_async_notifier {
* @notifier: pointer to &struct v4l2_async_notifier
* @asd: pointer to &struct v4l2_async_subdev
*
- * This can be used before registering a notifier to add an
- * asd to the notifiers master asd_list. If the caller uses
- * this method to compose an asd list, it must never allocate
- * or place asd's in the @subdevs array.
+ * Call this function before registering a notifier to link the
+ * provided asd to the notifiers master asd_list.
*/
int v4l2_async_notifier_add_subdev(struct v4l2_async_notifier *notifier,
struct v4l2_async_subdev *asd);
@@ -176,10 +172,8 @@ int v4l2_async_notifier_add_subdev(struct v4l2_async_notifier *notifier,
* the driver's async sub-device struct, i.e. both
* begin at the same memory address.
*
- * This can be used before registering a notifier to add a
- * fwnode-matched asd to the notifiers master asd_list. If the caller
- * uses this method to compose an asd list, it must never allocate
- * or place asd's in the @subdevs array.
+ * Allocate a fwnode-matched asd of size asd_struct_size, and add it
+ * to the notifiers @asd_list.
*/
struct v4l2_async_subdev *
v4l2_async_notifier_add_fwnode_subdev(struct v4l2_async_notifier *notifier,
diff --git a/include/media/v4l2-fwnode.h b/include/media/v4l2-fwnode.h
index 031ebb0..76ae106 100644
--- a/include/media/v4l2-fwnode.h
+++ b/include/media/v4l2-fwnode.h
@@ -259,11 +259,10 @@ typedef int (*parse_endpoint_func)(struct device *dev,
* This function may not be called on a registered notifier and may be called on
* a notifier only once.
*
- * Do not allocate the notifier's subdevs array, or change the notifier's
- * num_subdevs field. This is because this function uses
- * @v4l2_async_notifier_add_subdev to populate the notifier's asd_list,
- * which is in-place-of the subdevs array which must remain unallocated
- * and unused.
+ * Do not change the notifier's num_subdevs field. This is because this
+ * function uses @v4l2_async_notifier_add_subdev to populate the notifier's
+ * asd_list, which increments num_subdevs field to enforce an upper limit on
+ * the number of asd's that can be added to a notifier.
*
* The &struct v4l2_fwnode_endpoint passed to the callback function
* @parse_endpoint is released once the function is finished. If there is a need
@@ -316,11 +315,10 @@ int v4l2_async_notifier_parse_fwnode_endpoints(
* This function may not be called on a registered notifier and may be called on
* a notifier only once per port.
*
- * Do not allocate the notifier's subdevs array, or change the notifier's
- * num_subdevs field. This is because this function uses
- * @v4l2_async_notifier_add_subdev to populate the notifier's asd_list,
- * which is in-place-of the subdevs array which must remain unallocated
- * and unused.
+ * Do not change the notifier's num_subdevs field. This is because this
+ * function uses @v4l2_async_notifier_add_subdev to populate the notifier's
+ * asd_list, which increments num_subdevs field to enforce an upper limit on
+ * the number of asd's that can be added to a notifier.
*
* The &struct v4l2_fwnode_endpoint passed to the callback function
* @parse_endpoint is released once the function is finished. If there is a need
--
2.7.4
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