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-rw-r--r--drivers/acpi/scan.c49
-rw-r--r--drivers/base/core.c43
-rw-r--r--drivers/base/memory.c4
-rw-r--r--include/acpi/acpi_bus.h3
-rw-r--r--include/linux/device.h1
5 files changed, 48 insertions, 52 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index e76365136ba3..61d090b6ce25 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -287,6 +287,7 @@ static void acpi_bus_device_eject(void *context)
struct acpi_device *device = NULL;
struct acpi_scan_handler *handler;
u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
+ int error;
mutex_lock(&acpi_scan_lock);
@@ -301,17 +302,13 @@ static void acpi_bus_device_eject(void *context)
}
acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST,
ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
- if (handler->hotplug.mode == AHM_CONTAINER) {
- device->flags.eject_pending = true;
+ if (handler->hotplug.mode == AHM_CONTAINER)
kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
- } else {
- int error;
- get_device(&device->dev);
- error = acpi_scan_hot_remove(device);
- if (error)
- goto err_out;
- }
+ get_device(&device->dev);
+ error = acpi_scan_hot_remove(device);
+ if (error)
+ goto err_out;
out:
mutex_unlock(&acpi_scan_lock);
@@ -496,7 +493,6 @@ acpi_eject_store(struct device *d, struct device_attribute *attr,
struct acpi_eject_event *ej_event;
acpi_object_type not_used;
acpi_status status;
- u32 ost_source;
int ret;
if (!count || buf[0] != '1')
@@ -510,43 +506,28 @@ acpi_eject_store(struct device *d, struct device_attribute *attr,
if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
return -ENODEV;
- mutex_lock(&acpi_scan_lock);
-
- if (acpi_device->flags.eject_pending) {
- /* ACPI eject notification event. */
- ost_source = ACPI_NOTIFY_EJECT_REQUEST;
- acpi_device->flags.eject_pending = 0;
- } else {
- /* Eject initiated by user space. */
- ost_source = ACPI_OST_EC_OSPM_EJECT;
- }
ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
if (!ej_event) {
ret = -ENOMEM;
goto err_out;
}
- acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
+ acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
ej_event->device = acpi_device;
- ej_event->event = ost_source;
+ ej_event->event = ACPI_OST_EC_OSPM_EJECT;
get_device(&acpi_device->dev);
status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
- if (ACPI_FAILURE(status)) {
- put_device(&acpi_device->dev);
- kfree(ej_event);
- ret = status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
- goto err_out;
- }
- ret = count;
+ if (ACPI_SUCCESS(status))
+ return count;
- out:
- mutex_unlock(&acpi_scan_lock);
- return ret;
+ put_device(&acpi_device->dev);
+ kfree(ej_event);
+ ret = status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
err_out:
- acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
+ acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
- goto out;
+ return ret;
}
static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 8856d74545d9..ac419a15fcd4 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -49,6 +49,28 @@ static struct kobject *dev_kobj;
struct kobject *sysfs_dev_char_kobj;
struct kobject *sysfs_dev_block_kobj;
+static DEFINE_MUTEX(device_hotplug_lock);
+
+void lock_device_hotplug(void)
+{
+ mutex_lock(&device_hotplug_lock);
+}
+
+void unlock_device_hotplug(void)
+{
+ mutex_unlock(&device_hotplug_lock);
+}
+
+int lock_device_hotplug_sysfs(void)
+{
+ if (mutex_trylock(&device_hotplug_lock))
+ return 0;
+
+ /* Avoid busy looping (5 ms of sleep should do). */
+ msleep(5);
+ return restart_syscall();
+}
+
#ifdef CONFIG_BLOCK
static inline int device_is_not_partition(struct device *dev)
{
@@ -408,9 +430,9 @@ static ssize_t show_online(struct device *dev, struct device_attribute *attr,
{
bool val;
- lock_device_hotplug();
+ device_lock(dev);
val = !dev->offline;
- unlock_device_hotplug();
+ device_unlock(dev);
return sprintf(buf, "%u\n", val);
}
@@ -424,7 +446,10 @@ static ssize_t store_online(struct device *dev, struct device_attribute *attr,
if (ret < 0)
return ret;
- lock_device_hotplug();
+ ret = lock_device_hotplug_sysfs();
+ if (ret)
+ return ret;
+
ret = val ? device_online(dev) : device_offline(dev);
unlock_device_hotplug();
return ret < 0 ? ret : count;
@@ -1479,18 +1504,6 @@ EXPORT_SYMBOL_GPL(put_device);
EXPORT_SYMBOL_GPL(device_create_file);
EXPORT_SYMBOL_GPL(device_remove_file);
-static DEFINE_MUTEX(device_hotplug_lock);
-
-void lock_device_hotplug(void)
-{
- mutex_lock(&device_hotplug_lock);
-}
-
-void unlock_device_hotplug(void)
-{
- mutex_unlock(&device_hotplug_lock);
-}
-
static int device_check_offline(struct device *dev, void *not_used)
{
int ret;
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index 2b7813ec6d02..6f4c99ff1ce7 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -351,7 +351,9 @@ store_mem_state(struct device *dev,
mem = container_of(dev, struct memory_block, dev);
- lock_device_hotplug();
+ ret = lock_device_hotplug_sysfs();
+ if (ret)
+ return ret;
if (!strncmp(buf, "online_kernel", min_t(int, count, 13))) {
offline = false;
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 22650cd9e72a..02e113bb8b7d 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -167,9 +167,8 @@ struct acpi_device_flags {
u32 removable:1;
u32 ejectable:1;
u32 power_manageable:1;
- u32 eject_pending:1;
u32 match_driver:1;
- u32 reserved:26;
+ u32 reserved:27;
};
/* File System */
diff --git a/include/linux/device.h b/include/linux/device.h
index 22b546a58591..545a04285120 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -895,6 +895,7 @@ static inline bool device_supports_offline(struct device *dev)
extern void lock_device_hotplug(void);
extern void unlock_device_hotplug(void);
+extern int lock_device_hotplug_sysfs(void);
extern int device_offline(struct device *dev);
extern int device_online(struct device *dev);
/*
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 05:14:37 +0000