From: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Date: Thu, 24 Jan 2008 15:56:14 +0000 (+0200)
Subject: UBI: handle zero-length case
X-Git-Tag: v2.6.25-rc1~296^2~10^2~3
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=60c031531a85b3580f66c2530f9b2802adcad4df;p=karo-tx-linux.git

UBI: handle zero-length case

ubi_eba_atomic_leb_change() has to just map the LEB to a free PEB
if data length is zero.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
---

diff --git a/drivers/mtd/ubi/eba.c b/drivers/mtd/ubi/eba.c
index 1f7375e2ffb8..7ce91ca742b1 100644
--- a/drivers/mtd/ubi/eba.c
+++ b/drivers/mtd/ubi/eba.c
@@ -862,6 +862,17 @@ int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
 	if (ubi->ro_mode)
 		return -EROFS;
 
+	if (len == 0) {
+		/*
+		 * Special case when data length is zero. In this case the LEB
+		 * has to be unmapped and mapped somewhere else.
+		 */
+		err = ubi_eba_unmap_leb(ubi, vol, lnum);
+		if (err)
+			return err;
+		return ubi_eba_write_leb(ubi, vol, lnum, NULL, 0, 0, dtype);
+	}
+
 	vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS);
 	if (!vid_hdr)
 		return -ENOMEM;