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Revert "driver core: Fix uevent_show() vs driver detach race"
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This reverts commit 15fffc6.

This commit causes a regression, so revert it for now until it can come
back in a way that works for everyone.

Link: https://lore.kernel.org/all/172790598832.1168608.4519484276671503678.stgit@dwillia2-xfh.jf.intel.com/
Fixes: 15fffc6 ("driver core: Fix uevent_show() vs driver detach race")
Cc: stable <stable@kernel.org>
Cc: Ashish Sangwan <a.sangwan@samsung.com>
Cc: Namjae Jeon <namjae.jeon@samsung.com>
Cc: Dirk Behme <dirk.behme@de.bosch.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Rafael J. Wysocki <rafael@kernel.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Greg Kroah-Hartman committed Oct 29, 2024
1 parent 8e929cb commit 9a71892
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Showing 2 changed files with 5 additions and 12 deletions.
13 changes: 5 additions & 8 deletions drivers/base/core.c
Original file line number Diff line number Diff line change
Expand Up @@ -26,7 +26,6 @@
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pm_runtime.h>
#include <linux/rcupdate.h>
#include <linux/sched/mm.h>
#include <linux/sched/signal.h>
#include <linux/slab.h>
Expand Down Expand Up @@ -2634,7 +2633,6 @@ static const char *dev_uevent_name(const struct kobject *kobj)
static int dev_uevent(const struct kobject *kobj, struct kobj_uevent_env *env)
{
const struct device *dev = kobj_to_dev(kobj);
struct device_driver *driver;
int retval = 0;

/* add device node properties if present */
Expand Down Expand Up @@ -2663,12 +2661,8 @@ static int dev_uevent(const struct kobject *kobj, struct kobj_uevent_env *env)
if (dev->type && dev->type->name)
add_uevent_var(env, "DEVTYPE=%s", dev->type->name);

/* Synchronize with module_remove_driver() */
rcu_read_lock();
driver = READ_ONCE(dev->driver);
if (driver)
add_uevent_var(env, "DRIVER=%s", driver->name);
rcu_read_unlock();
if (dev->driver)
add_uevent_var(env, "DRIVER=%s", dev->driver->name);

/* Add common DT information about the device */
of_device_uevent(dev, env);
Expand Down Expand Up @@ -2738,8 +2732,11 @@ static ssize_t uevent_show(struct device *dev, struct device_attribute *attr,
if (!env)
return -ENOMEM;

/* Synchronize with really_probe() */
device_lock(dev);
/* let the kset specific function add its keys */
retval = kset->uevent_ops->uevent(&dev->kobj, env);
device_unlock(dev);
if (retval)
goto out;

Expand Down
4 changes: 0 additions & 4 deletions drivers/base/module.c
Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,6 @@
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/rcupdate.h>
#include "base.h"

static char *make_driver_name(const struct device_driver *drv)
Expand Down Expand Up @@ -102,9 +101,6 @@ void module_remove_driver(const struct device_driver *drv)
if (!drv)
return;

/* Synchronize with dev_uevent() */
synchronize_rcu();

sysfs_remove_link(&drv->p->kobj, "module");

if (drv->owner)
Expand Down

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