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Message-Id: <1531175957-1973-14-git-send-email-steve_longerbeam@mentor.com>
Date: Mon, 9 Jul 2018 15:39:13 -0700
From: Steve Longerbeam <slongerbeam@...il.com>
To: linux-media@...r.kernel.org
Cc: Steve Longerbeam <steve_longerbeam@...tor.com>,
Steve Longerbeam <slongerbeam@...il.com>,
Philipp Zabel <p.zabel@...gutronix.de>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
devel@...verdev.osuosl.org (open list:STAGING SUBSYSTEM),
linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v6 13/17] media: staging/imx: Switch to v4l2_async_notifier_add_*_subdev
Switch to v4l2_async_notifier_add_*_subdev() when adding async subdevs
to the imx-media root notifier. This removes the need to check for
an already added asd, since v4l2_async_notifier_add_*_subdev() does this
check. Also no need to allocate a subdevs array when registering the
root notifier, or keeping an internal master asd_list, since this is
moved to the notifier's asd_list.
Signed-off-by: Steve Longerbeam <steve_longerbeam@...tor.com>
---
Changes since v5:
- remove reference to notifier.num_subdevs and call
v4l2_async_notifier_init(). Suggested by Sakari Ailus.
---
drivers/staging/media/imx/imx-media-dev.c | 121 ++++++----------------
drivers/staging/media/imx/imx-media-internal-sd.c | 5 +-
drivers/staging/media/imx/imx-media.h | 4 +-
3 files changed, 36 insertions(+), 94 deletions(-)
diff --git a/drivers/staging/media/imx/imx-media-dev.c b/drivers/staging/media/imx/imx-media-dev.c
index 982e455..659420e 100644
--- a/drivers/staging/media/imx/imx-media-dev.c
+++ b/drivers/staging/media/imx/imx-media-dev.c
@@ -33,43 +33,10 @@ static inline struct imx_media_dev *notifier2dev(struct v4l2_async_notifier *n)
}
/*
- * Find an asd by fwnode or device name. This is called during
- * driver load to form the async subdev list and bind them.
- */
-static struct v4l2_async_subdev *
-find_async_subdev(struct imx_media_dev *imxmd,
- struct fwnode_handle *fwnode,
- const char *devname)
-{
- struct imx_media_async_subdev *imxasd;
- struct v4l2_async_subdev *asd;
-
- list_for_each_entry(imxasd, &imxmd->asd_list, list) {
- asd = &imxasd->asd;
- switch (asd->match_type) {
- case V4L2_ASYNC_MATCH_FWNODE:
- if (fwnode && asd->match.fwnode == fwnode)
- return asd;
- break;
- case V4L2_ASYNC_MATCH_DEVNAME:
- if (devname && !strcmp(asd->match.device_name,
- devname))
- return asd;
- break;
- default:
- break;
- }
- }
-
- return NULL;
-}
-
-
-/*
- * Adds a subdev to the async subdev list. If fwnode is non-NULL, adds
- * the async as a V4L2_ASYNC_MATCH_FWNODE match type, otherwise as
- * a V4L2_ASYNC_MATCH_DEVNAME match type using the dev_name of the
- * given platform_device. This is called during driver load when
+ * Adds a subdev to the root notifier's async subdev list. If fwnode is
+ * non-NULL, adds the async as a V4L2_ASYNC_MATCH_FWNODE match type,
+ * otherwise as a V4L2_ASYNC_MATCH_DEVNAME match type using the dev_name
+ * of the given platform_device. This is called during driver load when
* forming the async subdev list.
*/
int imx_media_add_async_subdev(struct imx_media_dev *imxmd,
@@ -80,47 +47,34 @@ int imx_media_add_async_subdev(struct imx_media_dev *imxmd,
struct imx_media_async_subdev *imxasd;
struct v4l2_async_subdev *asd;
const char *devname = NULL;
- int ret = 0;
-
- mutex_lock(&imxmd->mutex);
+ int ret;
- if (pdev)
+ if (fwnode) {
+ asd = v4l2_async_notifier_add_fwnode_subdev(
+ &imxmd->notifier, fwnode, sizeof(*imxasd));
+ } else {
devname = dev_name(&pdev->dev);
-
- /* return -EEXIST if this asd already added */
- if (find_async_subdev(imxmd, fwnode, devname)) {
- dev_dbg(imxmd->md.dev, "%s: already added %s\n",
- __func__, np ? np->name : devname);
- ret = -EEXIST;
- goto out;
+ asd = v4l2_async_notifier_add_devname_subdev(
+ &imxmd->notifier, devname, sizeof(*imxasd));
}
- imxasd = devm_kzalloc(imxmd->md.dev, sizeof(*imxasd), GFP_KERNEL);
- if (!imxasd) {
- ret = -ENOMEM;
- goto out;
- }
- asd = &imxasd->asd;
-
- if (fwnode) {
- asd->match_type = V4L2_ASYNC_MATCH_FWNODE;
- asd->match.fwnode = fwnode;
- } else {
- asd->match_type = V4L2_ASYNC_MATCH_DEVNAME;
- asd->match.device_name = devname;
- imxasd->pdev = pdev;
+ if (IS_ERR(asd)) {
+ ret = PTR_ERR(asd);
+ if (ret == -EEXIST)
+ dev_dbg(imxmd->md.dev, "%s: already added %s\n",
+ __func__, np ? np->name : devname);
+ return ret;
}
- list_add_tail(&imxasd->list, &imxmd->asd_list);
+ imxasd = to_imx_media_asd(asd);
- imxmd->notifier.num_subdevs++;
+ if (devname)
+ imxasd->pdev = pdev;
dev_dbg(imxmd->md.dev, "%s: added %s, match type %s\n",
__func__, np ? np->name : devname, np ? "FWNODE" : "DEVNAME");
-out:
- mutex_unlock(&imxmd->mutex);
- return ret;
+ return 0;
}
/*
@@ -483,10 +437,8 @@ static int imx_media_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *node = dev->of_node;
- struct imx_media_async_subdev *imxasd;
- struct v4l2_async_subdev **subdevs;
struct imx_media_dev *imxmd;
- int num_subdevs, i, ret;
+ int ret;
imxmd = devm_kzalloc(dev, sizeof(*imxmd), GFP_KERNEL);
if (!imxmd)
@@ -515,44 +467,31 @@ static int imx_media_probe(struct platform_device *pdev)
dev_set_drvdata(imxmd->v4l2_dev.dev, imxmd);
- INIT_LIST_HEAD(&imxmd->asd_list);
INIT_LIST_HEAD(&imxmd->vdev_list);
+ v4l2_async_notifier_init(&imxmd->notifier);
+
ret = imx_media_add_of_subdevs(imxmd, node);
if (ret) {
v4l2_err(&imxmd->v4l2_dev,
"add_of_subdevs failed with %d\n", ret);
- goto unreg_dev;
+ goto notifier_cleanup;
}
ret = imx_media_add_internal_subdevs(imxmd);
if (ret) {
v4l2_err(&imxmd->v4l2_dev,
"add_internal_subdevs failed with %d\n", ret);
- goto unreg_dev;
+ goto notifier_cleanup;
}
- num_subdevs = imxmd->notifier.num_subdevs;
-
/* no subdevs? just bail */
- if (num_subdevs == 0) {
+ if (list_empty(&imxmd->notifier.asd_list)) {
ret = -ENODEV;
- goto unreg_dev;
+ goto notifier_cleanup;
}
- subdevs = devm_kcalloc(imxmd->md.dev, num_subdevs, sizeof(*subdevs),
- GFP_KERNEL);
- if (!subdevs) {
- ret = -ENOMEM;
- goto unreg_dev;
- }
-
- i = 0;
- list_for_each_entry(imxasd, &imxmd->asd_list, list)
- subdevs[i++] = &imxasd->asd;
-
/* prepare the async subdev notifier and register it */
- imxmd->notifier.subdevs = subdevs;
imxmd->notifier.ops = &imx_media_subdev_ops;
ret = v4l2_async_notifier_register(&imxmd->v4l2_dev,
&imxmd->notifier);
@@ -566,7 +505,8 @@ static int imx_media_probe(struct platform_device *pdev)
del_int:
imx_media_remove_internal_subdevs(imxmd);
-unreg_dev:
+notifier_cleanup:
+ v4l2_async_notifier_cleanup(&imxmd->notifier);
v4l2_device_unregister(&imxmd->v4l2_dev);
cleanup:
media_device_cleanup(&imxmd->md);
@@ -582,6 +522,7 @@ static int imx_media_remove(struct platform_device *pdev)
v4l2_async_notifier_unregister(&imxmd->notifier);
imx_media_remove_internal_subdevs(imxmd);
+ v4l2_async_notifier_cleanup(&imxmd->notifier);
v4l2_device_unregister(&imxmd->v4l2_dev);
media_device_unregister(&imxmd->md);
media_device_cleanup(&imxmd->md);
diff --git a/drivers/staging/media/imx/imx-media-internal-sd.c b/drivers/staging/media/imx/imx-media-internal-sd.c
index daf66c2..0fdc45d 100644
--- a/drivers/staging/media/imx/imx-media-internal-sd.c
+++ b/drivers/staging/media/imx/imx-media-internal-sd.c
@@ -350,8 +350,11 @@ int imx_media_add_internal_subdevs(struct imx_media_dev *imxmd)
void imx_media_remove_internal_subdevs(struct imx_media_dev *imxmd)
{
struct imx_media_async_subdev *imxasd;
+ struct v4l2_async_subdev *asd;
+
+ list_for_each_entry(asd, &imxmd->notifier.asd_list, asd_list) {
+ imxasd = to_imx_media_asd(asd);
- list_for_each_entry(imxasd, &imxmd->asd_list, list) {
if (!imxasd->pdev)
continue;
diff --git a/drivers/staging/media/imx/imx-media.h b/drivers/staging/media/imx/imx-media.h
index 227b79c..bc7feb8 100644
--- a/drivers/staging/media/imx/imx-media.h
+++ b/drivers/staging/media/imx/imx-media.h
@@ -119,12 +119,11 @@ struct imx_media_internal_sd_platformdata {
int ipu_id;
};
-
struct imx_media_async_subdev {
+ /* the base asd - must be first in this struct */
struct v4l2_async_subdev asd;
/* the platform device of IPU-internal subdevs */
struct platform_device *pdev;
- struct list_head list;
};
static inline struct imx_media_async_subdev *
@@ -149,7 +148,6 @@ struct imx_media_dev {
struct ipu_soc *ipu[2];
/* for async subdev registration */
- struct list_head asd_list;
struct v4l2_async_notifier notifier;
};
--
2.7.4
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