tree ccd0f704dd4021d7407d72a17e93900b1191eaa4
parent 44ebd641be56653803482756aca487b5152a22d5
author Sascha Hauer <s.hauer@pengutronix.de> 1512486080 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1518870074 +0100

ubi: fastmap: Erase outdated anchor PEBs during attach

commit f78e5623f45bab2b726eec29dc5cefbbab2d0b1c upstream.

The fastmap update code might erase the current fastmap anchor PEB
in case it doesn't find any new free PEB. When a power cut happens
in this situation we must not have any outdated fastmap anchor PEB
on the device, because that would be used to attach during next
boot.
The easiest way to make that sure is to erase all outdated fastmap
anchor PEBs synchronously during attach.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: Richard Weinberger <richard@nod.at>
Fixes: dbb7d2a88d2a ("UBI: Add fastmap core")
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>