[PATCH] add sysfs attr to re-emit device hotplug event

A "coldplug + udevstart" can be simple like this:
  for i in /sys/block/*/*/uevent; do echo 1 > $i; done
  for i in /sys/class/*/*/uevent; do echo 1 > $i; done
  for i in /sys/bus/*/devices/*/uevent; do echo 1 > $i; done

Signed-off-by: Kay Sievers <kay.sievers@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 29 insertions, 29 deletions

diff --git a/include/linux/device.h b/include/linux/device.h
index a53a822c4d16..e86a580b72e1 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -190,6 +190,18 @@ struct class_attribute class_attr_##_name = __ATTR(_name,_mode,_show,_store)
 extern int class_create_file(struct class *, const struct class_attribute *);
 extern void class_remove_file(struct class *, const struct class_attribute *);
 
+struct class_device_attribute {
+        struct attribute        attr;
+        ssize_t (*show)(struct class_device *, char * buf);
+        ssize_t (*store)(struct class_device *, const char * buf, size_t count);
+};
+
+#define CLASS_DEVICE_ATTR(_name,_mode,_show,_store)             \
+struct class_device_attribute class_device_attr_##_name =       \
+        __ATTR(_name,_mode,_show,_store)
+
+extern int class_device_create_file(struct class_device *,
+                                    const struct class_device_attribute *);
 
 struct class_device {
         struct list_head        node;
@@ -198,6 +210,7 @@ struct class_device {
         struct class            * class;        /* required */
         dev_t                   devt;           /* dev_t, creates the sysfs "dev" */
         struct class_device_attribute *devt_attr;
+        struct class_device_attribute uevent_attr;
         struct device           * dev;          /* not necessary, but nice to have */
         void                    * class_data;   /* class-specific data */
 
@@ -228,18 +241,6 @@ extern int class_device_rename(struct class_device *, char *);
 extern struct class_device * class_device_get(struct class_device *);
 extern void class_device_put(struct class_device *);
 
-struct class_device_attribute {
-        struct attribute        attr;
-        ssize_t (*show)(struct class_device *, char * buf);
-        ssize_t (*store)(struct class_device *, const char * buf, size_t count);
-};
-
-#define CLASS_DEVICE_ATTR(_name,_mode,_show,_store)             \
-struct class_device_attribute class_device_attr_##_name =       \
-        __ATTR(_name,_mode,_show,_store)
-
-extern int class_device_create_file(struct class_device *, 
-                                    const struct class_device_attribute *);
 extern void class_device_remove_file(struct class_device *, 
                                      const struct class_device_attribute *);
 extern int class_device_create_bin_file(struct class_device *,
@@ -266,6 +267,20 @@ extern struct class_device *class_device_create(struct class *cls, dev_t devt,
 extern void class_device_destroy(struct class *cls, dev_t devt);
 
 
+/* interface for exporting device attributes */
+struct device_attribute {
+        struct attribute        attr;
+        ssize_t (*show)(struct device *dev, struct device_attribute *attr,
+                        char *buf);
+        ssize_t (*store)(struct device *dev, struct device_attribute *attr,
+                         const char *buf, size_t count);
+};
+
+#define DEVICE_ATTR(_name,_mode,_show,_store) \
+struct device_attribute dev_attr_##_name = __ATTR(_name,_mode,_show,_store)
+
+extern int device_create_file(struct device *device, struct device_attribute * entry);
+extern void device_remove_file(struct device * dev, struct device_attribute * attr);
 struct device {
         struct klist            klist_children;
         struct klist_node       knode_parent;           /* node in sibling list */
@@ -275,6 +290,7 @@ struct device {
 
         struct kobject kobj;
         char    bus_id[BUS_ID_SIZE];    /* position on parent bus */
+        struct device_attribute uevent_attr;
 
         struct semaphore        sem;    /* semaphore to synchronize calls to
                                          * its driver.
@@ -343,23 +359,6 @@ extern int  device_attach(struct device * dev);
 extern void driver_attach(struct device_driver * drv);
 
 
-/* driverfs interface for exporting device attributes */
-
-struct device_attribute {
-        struct attribute        attr;
-        ssize_t (*show)(struct device *dev, struct device_attribute *attr,
-                        char *buf);
-        ssize_t (*store)(struct device *dev, struct device_attribute *attr,
-                         const char *buf, size_t count);
-};
-
-#define DEVICE_ATTR(_name,_mode,_show,_store) \
-struct device_attribute dev_attr_##_name = __ATTR(_name,_mode,_show,_store)
-
-
-extern int device_create_file(struct device *device, struct device_attribute * entry);
-extern void device_remove_file(struct device * dev, struct device_attribute * attr);
-
 /*
  * Platform "fixup" functions - allow the platform to have their say
  * about devices and actions that the general device layer doesn't
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 01796c41c951..78af34840c69 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -132,6 +132,7 @@ struct gendisk {
 struct disk_attribute {
         struct attribute attr;
         ssize_t (*show)(struct gendisk *, char *);
+        ssize_t (*store)(struct gendisk *, const char *, size_t);
 };
 
 /*