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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-10-29 01:23:04 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-11-08 16:28:23 +0100 |
| commit | fd28d9589460945985ef5333e9b942c4261f0826 (patch) | |
| tree | fddeeeb0eb9f5e0485d211096af948f5ada9fd0c /drivers | |
| parent | a762d0fc17df20967c380b3e2076f27ce7e1ea1e (diff) | |
| download | linux-rpi-fd28d9589460945985ef5333e9b942c4261f0826.tar.gz linux-rpi-fd28d9589460945985ef5333e9b942c4261f0826.tar.bz2 linux-rpi-fd28d9589460945985ef5333e9b942c4261f0826.zip | |
Revert "driver core: Fix uevent_show() vs driver detach race"
commit 9a71892cbcdb9d1459c84f5a4c722b14354158a5 upstream.
This reverts commit 15fffc6a5624b13b428bb1c6e9088e32a55eb82c.
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: 15fffc6a5624 ("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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/base/core.c | 13 | ||||
| -rw-r--r-- | drivers/base/module.c | 4 |
2 files changed, 5 insertions, 12 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c index 60a0a4630a5b..009723a41d07 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -25,7 +25,6 @@ #include <linux/mutex.h> #include <linux/pm_runtime.h> #include <linux/netdevice.h> -#include <linux/rcupdate.h> #include <linux/sched/signal.h> #include <linux/sched/mm.h> #include <linux/string_helpers.h> @@ -2566,7 +2565,6 @@ 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 */ @@ -2595,12 +2593,8 @@ 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); @@ -2670,8 +2664,11 @@ 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; diff --git a/drivers/base/module.c b/drivers/base/module.c index 0d5c5da367f7..a33663d92256 100644 --- a/drivers/base/module.c +++ b/drivers/base/module.c @@ -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(struct device_driver *drv) @@ -102,9 +101,6 @@ void module_remove_driver(struct device_driver *drv) if (!drv) return; - /* Synchronize with dev_uevent() */ - synchronize_rcu(); - sysfs_remove_link(&drv->p->kobj, "module"); if (drv->owner) |