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Revert "driver core: shut down devices asynchronously"

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This reverts commit 8064952c65.

The series is being reverted before -rc1 as there are still reports of
lockups on shutdown, so it's not quite ready for "prime time."

Reported-by: Andrey Skvortsov <andrej.skvortzov@gmail.com>
Link: https://lore.kernel.org/r/ZvMkkhyJrohaajuk@skv.local
Cc: Christoph Hellwig <hch@lst.de>
Cc: David Jeffery <djeffery@redhat.com>
Cc: Keith Busch <kbusch@kernel.org>
Cc: Laurence Oberman <loberman@redhat.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Sagi Grimberg <sagi@grimberg.me>
Cc: Stuart Hayes <stuart.w.hayes@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2024-09-25 10:57:00 +02:00
parent ec1fcbae19
commit 2efddb5575
3 changed files with 1 additions and 59 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/base/base.h
View File

@ -10,7 +10,6 @@
* shared outside of the drivers/base/ directory.
*
*/
#include <linux/async.h>
#include <linux/notifier.h>
/**
@ -98,8 +97,6 @@ struct driver_private {
* the device; typically because it depends on another driver getting
* probed first.
* @async_driver - pointer to device driver awaiting probe via async_probe
* @shutdown_after - used during device shutdown to ensure correct shutdown
* ordering.
* @device - pointer back to the struct device that this structure is
* associated with.
* @dead - This device is currently either in the process of or has been
@ -117,7 +114,6 @@ struct device_private {
struct list_head deferred_probe;
const struct device_driver *async_driver;
char *deferred_probe_reason;
async_cookie_t shutdown_after;
struct device *device;
u8 dead:1;
};

54
drivers/base/core.c
View File

@ -9,7 +9,6 @@
*/
#include <linux/acpi.h>
#include <linux/async.h>
#include <linux/blkdev.h>
#include <linux/cleanup.h>
#include <linux/cpufreq.h>
@ -3525,7 +3524,6 @@ static int device_private_init(struct device *dev)
klist_init(&dev->p->klist_children, klist_children_get,
klist_children_put);
INIT_LIST_HEAD(&dev->p->deferred_probe);
dev->p->shutdown_after = 0;
return 0;
}
@ -4781,8 +4779,6 @@ out:
}
EXPORT_SYMBOL_GPL(device_change_owner);
static ASYNC_DOMAIN(sd_domain);
static void shutdown_one_device(struct device *dev)
{
/* hold lock to avoid race with probe/release */
@ -4818,34 +4814,12 @@ static void shutdown_one_device(struct device *dev)
put_device(dev->parent);
}
/**
* shutdown_one_device_async
* @data: the pointer to the struct device to be shutdown
* @cookie: not used
*
* Shuts down one device, after waiting for shutdown_after to complete.
* shutdown_after should be set to the cookie of the last child or consumer
* of this device to be shutdown (if any), or to the cookie of the previous
* device to be shut down for devices that don't enable asynchronous shutdown.
*/
static void shutdown_one_device_async(void *data, async_cookie_t cookie)
{
struct device *dev = data;
async_synchronize_cookie_domain(dev->p->shutdown_after + 1, &sd_domain);
shutdown_one_device(dev);
}
/**
* device_shutdown - call ->shutdown() on each device to shutdown.
*/
void device_shutdown(void)
{
struct device *dev, *parent;
async_cookie_t cookie = 0;
struct device_link *link;
int idx;
wait_for_device_probe();
device_block_probing();
@ -4876,37 +4850,11 @@ void device_shutdown(void)
list_del_init(&dev->kobj.entry);
spin_unlock(&devices_kset->list_lock);
/*
* Set cookie for devices that will be shut down synchronously
*/
if (!dev->driver || !dev->driver->async_shutdown_enable)
dev->p->shutdown_after = cookie;
get_device(dev);
get_device(parent);
cookie = async_schedule_domain(shutdown_one_device_async,
dev, &sd_domain);
/*
* Ensure parent & suppliers wait for this device to shut down
*/
if (parent) {
parent->p->shutdown_after = cookie;
put_device(parent);
}
idx = device_links_read_lock();
list_for_each_entry_rcu(link, &dev->links.suppliers, c_node,
device_links_read_lock_held())
link->supplier->p->shutdown_after = cookie;
device_links_read_unlock(idx);
put_device(dev);
shutdown_one_device(dev);
spin_lock(&devices_kset->list_lock);
}
spin_unlock(&devices_kset->list_lock);
async_synchronize_full_domain(&sd_domain);
}
/*

2
include/linux/device/driver.h
View File

@ -56,7 +56,6 @@ enum probe_type {
* @mod_name: Used for built-in modules.
* @suppress_bind_attrs: Disables bind/unbind via sysfs.
* @probe_type: Type of the probe (synchronous or asynchronous) to use.
* @async_shutdown_enable: Enables devices to be shutdown asynchronously.
* @of_match_table: The open firmware table.
* @acpi_match_table: The ACPI match table.
* @probe: Called to query the existence of a specific device,
@ -103,7 +102,6 @@ struct device_driver {
bool suppress_bind_attrs; /* disables bind/unbind via sysfs */
enum probe_type probe_type;
bool async_shutdown_enable;
const struct of_device_id *of_match_table;
const struct acpi_device_id *acpi_match_table;