linux-kernel - [PATCH 15/35] UBI: Fastmap: Enhance fastmap checking

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Message-Id: <1414586758-9972-16-git-send-email-richard@nod.at>
Date:	Wed, 29 Oct 2014 13:45:38 +0100
From:	Richard Weinberger <richard@....at>
To:	dedekind1@...il.com
Cc:	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
	tlinder@...eaurora.org, Richard Weinberger <richard@....at>
Subject: [PATCH 15/35] UBI: Fastmap: Enhance fastmap checking

Don't update the fastmap upon detach if fastmap checking is enabled.
This is poor men's power cut testing feature. :-)

Signed-off-by: Richard Weinberger <richard@....at>
---
 drivers/mtd/ubi/build.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 941110d..3712f88 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -1110,8 +1110,11 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway)
 	ubi_msg("detaching mtd%d from ubi%d", ubi->mtd->index, ubi_num);
 #ifdef CONFIG_MTD_UBI_FASTMAP
 	/* If we don't write a new fastmap at detach time we lose all
-	 * EC updates that have been made since the last written fastmap. */
-	ubi_update_fastmap(ubi);
+	 * EC updates that have been made since the last written fastmap.
+	 * In case of fastmap debugging we omit the update to simulate an
+	 * unclean shutdown. */
+	if (!ubi_dbg_chk_fastmap(ubi))
+		ubi_update_fastmap(ubi);
 #endif
 	/*
 	 * Before freeing anything, we have to stop the background thread to
-- 
1.8.4.5

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