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Revert "driver core: Add sync_state driver/bus callback"

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This reverts commit 8f8184d6bf.

Based on a lot of email and in-person discussions, this patch series is
being reworked to address a number of issues that were pointed out that
needed to be taken care of before it should be merged.  It will be
resubmitted with those changes hopefully soon.

Cc: Frank Rowand <frowand.list@gmail.com>
Cc: Saravana Kannan <saravanak@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman
2019-08-27 21:40:50 +02:00
parent 77df8e7900
commit bcca686c11
2 changed files with 0 additions and 91 deletions
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65
drivers/base/core.c
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@@ -46,8 +46,6 @@ early_param("sysfs.deprecated", sysfs_deprecated_setup);
/* Device links support. */
static LIST_HEAD(wait_for_suppliers);
static DEFINE_MUTEX(wfs_lock);
static LIST_HEAD(deferred_sync);
static unsigned int supplier_sync_state_disabled;
#ifdef CONFIG_SRCU
static DEFINE_MUTEX(device_links_lock);
@@ -653,62 +651,6 @@ int device_links_check_suppliers(struct device *dev)
return ret;
}
static void __device_links_supplier_sync_state(struct device *dev)
{
struct device_link *link;
if (dev->state_synced)
return;
list_for_each_entry(link, &dev->links.consumers, s_node) {
if (!(link->flags & DL_FLAG_MANAGED))
continue;
if (link->status != DL_STATE_ACTIVE)
return;
}
if (dev->bus->sync_state)
dev->bus->sync_state(dev);
else if (dev->driver && dev->driver->sync_state)
dev->driver->sync_state(dev);
dev->state_synced = true;
}
void device_links_supplier_sync_state_pause(void)
{
device_links_write_lock();
supplier_sync_state_disabled++;
device_links_write_unlock();
}
void device_links_supplier_sync_state_resume(void)
{
struct device *dev, *tmp;
device_links_write_lock();
if (!supplier_sync_state_disabled) {
WARN(true, "Unmatched sync_state pause/resume!");
goto out;
}
supplier_sync_state_disabled--;
if (supplier_sync_state_disabled)
goto out;
list_for_each_entry_safe(dev, tmp, &deferred_sync, links.defer_sync) {
__device_links_supplier_sync_state(dev);
list_del_init(&dev->links.defer_sync);
}
out:
device_links_write_unlock();
}
static void __device_links_supplier_defer_sync(struct device *sup)
{
if (list_empty(&sup->links.defer_sync))
list_add_tail(&sup->links.defer_sync, &deferred_sync);
}
/**
* device_links_driver_bound - Update device links after probing its driver.
* @dev: Device to update the links for.
@@ -753,11 +695,6 @@ void device_links_driver_bound(struct device *dev)
WARN_ON(link->status != DL_STATE_CONSUMER_PROBE);
WRITE_ONCE(link->status, DL_STATE_ACTIVE);
if (supplier_sync_state_disabled)
__device_links_supplier_defer_sync(link->supplier);
else
__device_links_supplier_sync_state(link->supplier);
}
dev->links.status = DL_DEV_DRIVER_BOUND;
@@ -874,7 +811,6 @@ void device_links_driver_cleanup(struct device *dev)
WRITE_ONCE(link->status, DL_STATE_DORMANT);
}
list_del_init(&dev->links.defer_sync);
__device_links_no_driver(dev);
device_links_write_unlock();
@@ -1849,7 +1785,6 @@ void device_initialize(struct device *dev)
INIT_LIST_HEAD(&dev->links.consumers);
INIT_LIST_HEAD(&dev->links.suppliers);
INIT_LIST_HEAD(&dev->links.needs_suppliers);
INIT_LIST_HEAD(&dev->links.defer_sync);
dev->links.status = DL_DEV_NO_DRIVER;
}
EXPORT_SYMBOL_GPL(device_initialize);