X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=block%2Fgenhd.c;h=fad9db981675c8a0f753127eb5dfa0f40dc881a4;hb=0a95d11068a459d35607f6af6e2b2d5ce9052cb8;hp=a5bed6bc869d66d7630a3d5a9f02a5c1adc54ede;hpb=d2d693d1ba7d93ec7c5db8aca2da29a4c91f6782;p=firefly-linux-kernel-4.4.55.git

diff --git a/block/genhd.c b/block/genhd.c
index a5bed6bc869d..fad9db981675 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1118,6 +1118,22 @@ 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",
 };
@@ -1137,6 +1153,7 @@ static struct device_type disk_type = {
 	.groups		= disk_attr_groups,
 	.release	= disk_release,
 	.devnode	= block_devnode,
+	.uevent		= disk_uevent,
 };
 
 #ifdef CONFIG_PROC_FS