X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=block%2Fgenhd.c;h=817c67c9e45e3966623b028f0d3d8722e4ebac1e;hb=4258bc23b8760f975b6b755a0862dfb0047ad55b;hp=e5cafa51567c9d589147523c8ab7b43504f9d725;hpb=361ddf2d69082a2f43fa58e14a407833bc62827d;p=firefly-linux-kernel-4.4.55.git

diff --git a/block/genhd.c b/block/genhd.c
index e5cafa51567c..817c67c9e45e 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1117,6 +1117,22 @@ static void disk_release(struct device *dev)
 		blk_put_queue(disk->queue);
 	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",
 };
@@ -1136,6 +1152,7 @@ static struct device_type disk_type = {
 	.groups		= disk_attr_groups,
 	.release	= disk_release,
 	.devnode	= block_devnode,
+	.uevent		= disk_uevent,
 };
 
 #ifdef CONFIG_PROC_FS