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authorLinus Torvalds <torvalds@linux-foundation.org>2020-12-15 23:02:26 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2020-12-15 23:02:26 +0100
commit7240153a9bdb77217b99b76fd73105bce12770be (patch)
treefbd0103d36e3806eef5f7aaf69155a780b83caec /drivers/of
parentMerge tag 'tty-5.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gre... (diff)
parentdriver core: platform: don't oops in platform_shutdown() on unbound devices (diff)
downloadlinux-7240153a9bdb77217b99b76fd73105bce12770be.tar.xz
linux-7240153a9bdb77217b99b76fd73105bce12770be.zip
Merge tag 'driver-core-5.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
Pull driver core updates from Greg KH: "Here is the big driver core updates for 5.11-rc1 This time there was a lot of different work happening here for some reason: - redo of the fwnode link logic, speeding it up greatly - auxiliary bus added (this was a tag that will be pulled in from other trees/maintainers this merge window as well, as driver subsystems started to rely on it) - platform driver core cleanups on the way to fixing some long-time api updates in future releases - minor fixes and tweaks. All have been in linux-next with no (finally) reported issues. Testing there did helped in shaking issues out a lot :)" * tag 'driver-core-5.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (39 commits) driver core: platform: don't oops in platform_shutdown() on unbound devices ACPI: Use fwnode_init() to set up fwnode misc: pvpanic: Replace OF headers by mod_devicetable.h misc: pvpanic: Combine ACPI and platform drivers usb: host: sl811: Switch to use platform_get_mem_or_io() vfio: platform: Switch to use platform_get_mem_or_io() driver core: platform: Introduce platform_get_mem_or_io() dyndbg: fix use before null check soc: fix comment for freeing soc_dev_attr driver core: platform: use bus_type functions driver core: platform: change logic implementing platform_driver_probe driver core: platform: reorder functions driver core: make driver_probe_device() static driver core: Fix a couple of typos driver core: Reorder devices on successful probe driver core: Delete pointless parameter in fwnode_operations.add_links driver core: Refactor fw_devlink feature efi: Update implementation of add_links() to create fwnode links of: property: Update implementation of add_links() to create fwnode links driver core: Use device's fwnode to check if it is waiting for suppliers ...
Diffstat (limited to 'drivers/of')
-rw-r--r--drivers/of/dynamic.c1
-rw-r--r--drivers/of/platform.c2
-rw-r--r--drivers/of/property.c149
3 files changed, 41 insertions, 111 deletions
diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c
index fe64430b438a..9a824decf61f 100644
--- a/drivers/of/dynamic.c
+++ b/drivers/of/dynamic.c
@@ -356,6 +356,7 @@ void of_node_release(struct kobject *kobj)
property_list_free(node->properties);
property_list_free(node->deadprops);
+ fwnode_links_purge(of_fwnode_handle(node));
kfree(node->full_name);
kfree(node->data);
diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index b557a0fcd4ba..79bd5f5a1bf1 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -538,9 +538,7 @@ static int __init of_platform_default_populate_init(void)
}
/* Populate everything else. */
- fw_devlink_pause();
of_platform_default_populate(NULL, NULL, NULL);
- fw_devlink_resume();
return 0;
}
diff --git a/drivers/of/property.c b/drivers/of/property.c
index 408a7b5f06a9..5f9eed79a8aa 100644
--- a/drivers/of/property.c
+++ b/drivers/of/property.c
@@ -1038,33 +1038,9 @@ static bool of_is_ancestor_of(struct device_node *test_ancestor,
}
/**
- * of_get_next_parent_dev - Add device link to supplier from supplier phandle
- * @np: device tree node
- *
- * Given a device tree node (@np), this function finds its closest ancestor
- * device tree node that has a corresponding struct device.
- *
- * The caller of this function is expected to call put_device() on the returned
- * device when they are done.
- */
-static struct device *of_get_next_parent_dev(struct device_node *np)
-{
- struct device *dev = NULL;
-
- of_node_get(np);
- do {
- np = of_get_next_parent(np);
- if (np)
- dev = get_dev_from_fwnode(&np->fwnode);
- } while (np && !dev);
- of_node_put(np);
- return dev;
-}
-
-/**
- * of_link_to_phandle - Add device link to supplier from supplier phandle
- * @dev: consumer device
- * @sup_np: phandle to supplier device tree node
+ * of_link_to_phandle - Add fwnode link to supplier from supplier phandle
+ * @con_np: consumer device tree node
+ * @sup_np: supplier device tree node
*
* Given a phandle to a supplier device tree node (@sup_np), this function
* finds the device that owns the supplier device tree node and creates a
@@ -1074,16 +1050,14 @@ static struct device *of_get_next_parent_dev(struct device_node *np)
* cases, it returns an error.
*
* Returns:
- * - 0 if link successfully created to supplier
- * - -EAGAIN if linking to the supplier should be reattempted
+ * - 0 if fwnode link successfully created to supplier
* - -EINVAL if the supplier link is invalid and should not be created
- * - -ENODEV if there is no device that corresponds to the supplier phandle
+ * - -ENODEV if struct device will never be create for supplier
*/
-static int of_link_to_phandle(struct device *dev, struct device_node *sup_np,
- u32 dl_flags)
+static int of_link_to_phandle(struct device_node *con_np,
+ struct device_node *sup_np)
{
- struct device *sup_dev, *sup_par_dev;
- int ret = 0;
+ struct device *sup_dev;
struct device_node *tmp_np = sup_np;
of_node_get(sup_np);
@@ -1106,7 +1080,8 @@ static int of_link_to_phandle(struct device *dev, struct device_node *sup_np,
}
if (!sup_np) {
- dev_dbg(dev, "Not linking to %pOFP - No device\n", tmp_np);
+ pr_debug("Not linking %pOFP to %pOFP - No device\n",
+ con_np, tmp_np);
return -ENODEV;
}
@@ -1115,53 +1090,30 @@ static int of_link_to_phandle(struct device *dev, struct device_node *sup_np,
* descendant nodes. By definition, a child node can't be a functional
* dependency for the parent node.
*/
- if (of_is_ancestor_of(dev->of_node, sup_np)) {
- dev_dbg(dev, "Not linking to %pOFP - is descendant\n", sup_np);
+ if (of_is_ancestor_of(con_np, sup_np)) {
+ pr_debug("Not linking %pOFP to %pOFP - is descendant\n",
+ con_np, sup_np);
of_node_put(sup_np);
return -EINVAL;
}
+
+ /*
+ * Don't create links to "early devices" that won't have struct devices
+ * created for them.
+ */
sup_dev = get_dev_from_fwnode(&sup_np->fwnode);
if (!sup_dev && of_node_check_flag(sup_np, OF_POPULATED)) {
- /* Early device without struct device. */
- dev_dbg(dev, "Not linking to %pOFP - No struct device\n",
- sup_np);
+ pr_debug("Not linking %pOFP to %pOFP - No struct device\n",
+ con_np, sup_np);
of_node_put(sup_np);
return -ENODEV;
- } else if (!sup_dev) {
- /*
- * DL_FLAG_SYNC_STATE_ONLY doesn't block probing and supports
- * cycles. So cycle detection isn't necessary and shouldn't be
- * done.
- */
- if (dl_flags & DL_FLAG_SYNC_STATE_ONLY) {
- of_node_put(sup_np);
- return -EAGAIN;
- }
-
- sup_par_dev = of_get_next_parent_dev(sup_np);
-
- if (sup_par_dev && device_is_dependent(dev, sup_par_dev)) {
- /* Cyclic dependency detected, don't try to link */
- dev_dbg(dev, "Not linking to %pOFP - cycle detected\n",
- sup_np);
- ret = -EINVAL;
- } else {
- /*
- * Can't check for cycles or no cycles. So let's try
- * again later.
- */
- ret = -EAGAIN;
- }
-
- of_node_put(sup_np);
- put_device(sup_par_dev);
- return ret;
}
- of_node_put(sup_np);
- if (!device_link_add(dev, sup_dev, dl_flags))
- ret = -EINVAL;
put_device(sup_dev);
- return ret;
+
+ fwnode_link_add(of_fwnode_handle(con_np), of_fwnode_handle(sup_np));
+ of_node_put(sup_np);
+
+ return 0;
}
/**
@@ -1361,37 +1313,29 @@ static const struct supplier_bindings of_supplier_bindings[] = {
* that list phandles to suppliers. If @prop_name isn't one, this function
* doesn't do anything.
*
- * If @prop_name is one, this function attempts to create device links from the
- * consumer device @dev to all the devices of the suppliers listed in
- * @prop_name.
+ * If @prop_name is one, this function attempts to create fwnode links from the
+ * consumer device tree node @con_np to all the suppliers device tree nodes
+ * listed in @prop_name.
*
- * Any failed attempt to create a device link will NOT result in an immediate
+ * Any failed attempt to create a fwnode link will NOT result in an immediate
* return. of_link_property() must create links to all the available supplier
- * devices even when attempts to create a link to one or more suppliers fail.
+ * device tree nodes even when attempts to create a link to one or more
+ * suppliers fail.
*/
-static int of_link_property(struct device *dev, struct device_node *con_np,
- const char *prop_name)
+static int of_link_property(struct device_node *con_np, const char *prop_name)
{
struct device_node *phandle;
const struct supplier_bindings *s = of_supplier_bindings;
unsigned int i = 0;
bool matched = false;
int ret = 0;
- u32 dl_flags;
-
- if (dev->of_node == con_np)
- dl_flags = fw_devlink_get_flags();
- else
- dl_flags = DL_FLAG_SYNC_STATE_ONLY;
/* Do not stop at first failed link, link all available suppliers. */
while (!matched && s->parse_prop) {
while ((phandle = s->parse_prop(con_np, prop_name, i))) {
matched = true;
i++;
- if (of_link_to_phandle(dev, phandle, dl_flags)
- == -EAGAIN)
- ret = -EAGAIN;
+ of_link_to_phandle(con_np, phandle);
of_node_put(phandle);
}
s++;
@@ -1399,31 +1343,18 @@ static int of_link_property(struct device *dev, struct device_node *con_np,
return ret;
}
-static int of_link_to_suppliers(struct device *dev,
- struct device_node *con_np)
+static int of_fwnode_add_links(struct fwnode_handle *fwnode)
{
- struct device_node *child;
struct property *p;
- int ret = 0;
+ struct device_node *con_np = to_of_node(fwnode);
- for_each_property_of_node(con_np, p)
- if (of_link_property(dev, con_np, p->name))
- ret = -ENODEV;
-
- for_each_available_child_of_node(con_np, child)
- if (of_link_to_suppliers(dev, child) && !ret)
- ret = -EAGAIN;
-
- return ret;
-}
+ if (!con_np)
+ return -EINVAL;
-static int of_fwnode_add_links(const struct fwnode_handle *fwnode,
- struct device *dev)
-{
- if (unlikely(!is_of_node(fwnode)))
- return 0;
+ for_each_property_of_node(con_np, p)
+ of_link_property(con_np, p->name);
- return of_link_to_suppliers(dev, to_of_node(fwnode));
+ return 0;
}
const struct fwnode_operations of_fwnode_ops = {