linux-kernel - [PATCH 15/15] UBI: Fastmap: Write a fastmap also while detaching.

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Date:	Thu, 21 Jun 2012 23:50:08 +0200
From:	Richard Weinberger <richard@....at>
To:	linux-mtd@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org, adrian.hunter@...el.com,
	Heinz.Egger@...utronix.de, thomas.wucher@...utronix.de,
	shmulik.ladkani@...il.com, tglx@...utronix.de,
	tim.bird@...sony.com, Marius.Mazarel@...l.ro,
	artem.bityutskiy@...ux.intel.com,
	Richard Weinberger <richard@....at>
Subject: [PATCH 15/15] UBI: Fastmap: Write a fastmap also while detaching.

To ensure that fastmap knows all EC values we have to do this.
Otherwise fastmap my miss EC updates.
E.g: If the WL sub-system moves data from PEB A to PEB B.
It picks B from the WL pool, moves the data to it an eraes A.
If we detach now (or a power cut happens) the new EC value is lost.

Signed-off-by: Richard Weinberger <richard@....at>
---
 drivers/mtd/ubi/build.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 186bc19..611d0c4 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -1051,6 +1051,8 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway)
 	ubi_notify_all(ubi, UBI_VOLUME_REMOVED, NULL);
 	dbg_msg("detaching mtd%d from ubi%d", ubi->mtd->index, ubi_num);
 
+	ubi_update_fastmap(ubi);
+
 	/*
 	 * Before freeing anything, we have to stop the background thread to
 	 * prevent it from doing anything on this device while we are freeing.
@@ -1058,10 +1060,6 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway)
 	if (ubi->bgt_thread)
 		kthread_stop(ubi->bgt_thread);
 
-	/* If no fastmap is present on the FLASH write one. */
-	if (!ubi->fm)
-		ubi_update_fastmap(ubi);
-
 	/*
 	 * Get a reference to the device in order to prevent 'dev_release()'
 	 * from freeing the @ubi object.
-- 
1.7.6.5

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