X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=block%2Fgenhd.c;h=cdd188b8ba3ce9a8abe1b8091c94e3fec7a01c14;hb=132c64c927bad88db65eac2ba8088991a617ff5e;hp=517e4332cb37481dcad965e8f9986f029b42e64a;hpb=ffece4808d253131e910a0e0afada82f60b1980a;p=firefly-linux-kernel-4.4.55.git

diff --git a/block/genhd.c b/block/genhd.c
index 517e4332cb37..cdd188b8ba3c 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -994,6 +994,22 @@ static void disk_release(struct device *dev)
 	free_part_stats(&disk->part0);
 	kfree(disk);
 }
+
+static int disk_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+	struct gendisk *disk = dev_to_disk(dev);
+	struct disk_part_iter piter;
+	struct hd_struct *part;
+	int cnt = 0;
+
+	disk_part_iter_init(&piter, disk, 0);
+	while((part = disk_part_iter_next(&piter)))
+		cnt++;
+	disk_part_iter_exit(&piter);
+	add_uevent_var(env, "NPARTS=%u", cnt);
+	return 0;
+}
+
 struct class block_class = {
 	.name		= "block",
 };
@@ -1012,6 +1028,7 @@ static struct device_type disk_type = {
 	.groups		= disk_attr_groups,
 	.release	= disk_release,
 	.devnode	= block_devnode,
+	.uevent		= disk_uevent,
 };
 
 #ifdef CONFIG_PROC_FS