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Revert "driver core: Add edit_links() callback for drivers" 

This reverts commit 134b23eec9.

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 21:41:06 +02:00
parent d77b3f07a1
commit 33cbfe5449
3 changed files with 2 additions and 71 deletions
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24
drivers/base/core.c
View File

@ -439,19 +439,6 @@ static void device_link_wait_for_supplier(struct device *consumer)
mutex_unlock(&wfs_lock);
}
/**
* device_link_remove_from_wfs - Unmark device as waiting for supplier
* @consumer: Consumer device
*
* Unmark the consumer device as waiting for suppliers to become available.
*/
void device_link_remove_from_wfs(struct device *consumer)
{
mutex_lock(&wfs_lock);
list_del_init(&consumer->links.needs_suppliers);
mutex_unlock(&wfs_lock);
}
/**
* device_link_check_waiting_consumers - Try to unmark waiting consumers
*
@ -469,19 +456,12 @@ void device_link_remove_from_wfs(struct device *consumer)
static void device_link_check_waiting_consumers(void)
{
struct device *dev, *tmp;
int ret;
mutex_lock(&wfs_lock);
list_for_each_entry_safe(dev, tmp, &wait_for_suppliers,
links.needs_suppliers) {
ret = 0;
if (dev->has_edit_links)
ret = driver_edit_links(dev);
else if (dev->bus->add_links)
ret = dev->bus->add_links(dev);
if (!ret)
links.needs_suppliers)
if (!dev->bus->add_links(dev))
list_del_init(&dev->links.needs_suppliers);
}
mutex_unlock(&wfs_lock);
}

29
drivers/base/dd.c
View File

@ -710,12 +710,6 @@ int driver_probe_device(struct device_driver *drv, struct device *dev)
pr_debug("bus: '%s': %s: matched device %s with driver %s\n",
drv->bus->name, __func__, dev_name(dev), drv->name);
if (drv->edit_links) {
if (drv->edit_links(dev))
dev->has_edit_links = true;
else
device_link_remove_from_wfs(dev);
}
pm_runtime_get_suppliers(dev);
if (dev->parent)
pm_runtime_get_sync(dev->parent);
@ -804,29 +798,6 @@ struct device_attach_data {
bool have_async;
};
static int __driver_edit_links(struct device_driver *drv, void *data)
{
struct device *dev = data;
if (!drv->edit_links)
return 0;
if (driver_match_device(drv, dev) <= 0)
return 0;
return drv->edit_links(dev);
}
int driver_edit_links(struct device *dev)
{
int ret;
device_lock(dev);
ret = bus_for_each_drv(dev->bus, NULL, dev, __driver_edit_links);
device_unlock(dev);
return ret;
}
static int __device_attach_driver(struct device_driver *drv, void *_data)
{
struct device_attach_data *data = _data;

20
include/linux/device.h
View File

@ -349,20 +349,6 @@ enum probe_type {
* @probe_type: Type of the probe (synchronous or asynchronous) to use.
* @of_match_table: The open firmware table.
* @acpi_match_table: The ACPI match table.
* @edit_links: Called to allow a matched driver to edit the device links the
* bus might have added incorrectly. This will be useful to handle
* cases where the bus incorrectly adds functional dependencies
* that aren't true or tries to create cyclic dependencies. But
* doesn't correctly handle functional dependencies that are
* missed by the bus as the supplier's sync_state might get to
* execute before the driver for a missing consumer is loaded and
* gets to edit the device links for the consumer.
*
* This function might be called multiple times after a new device
* is added. The function is expected to create all the device
* links for the new device and return 0 if it was completed
* successfully or return an error if it needs to be reattempted
* in the future.
* @probe: Called to query the existence of a specific device,
* whether this driver can work with it, and bind the driver
* to a specific device.
@ -404,7 +390,6 @@ struct device_driver {
const struct of_device_id *of_match_table;
const struct acpi_device_id *acpi_match_table;
int (*edit_links)(struct device *dev);
int (*probe) (struct device *dev);
int (*remove) (struct device *dev);
void (*shutdown) (struct device *dev);
@ -1240,8 +1225,6 @@ struct dev_links_info {
* @offline: Set after successful invocation of bus type's .offline().
* @of_node_reused: Set if the device-tree node is shared with an ancestor
* device.
* @has_edit_links: This device has a driver than is capable of
* editing the device links created by driver core.
* @dma_coherent: this particular device is dma coherent, even if the
* architecture supports non-coherent devices.
*
@ -1338,7 +1321,6 @@ struct device {
bool offline_disabled:1;
bool offline:1;
bool of_node_reused:1;
bool has_edit_links:1;
#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
@ -1590,7 +1572,6 @@ extern int __must_check device_attach(struct device *dev);
extern int __must_check driver_attach(struct device_driver *drv);
extern void device_initial_probe(struct device *dev);
extern int __must_check device_reprobe(struct device *dev);
extern int driver_edit_links(struct device *dev);
extern bool device_is_bound(struct device *dev);
@ -1682,7 +1663,6 @@ struct device_link *device_link_add(struct device *consumer,
struct device *supplier, u32 flags);
void device_link_del(struct device_link *link);
void device_link_remove(void *consumer, struct device *supplier);
void device_link_remove_from_wfs(struct device *consumer);
#ifndef dev_fmt
#define dev_fmt(fmt) fmt