UPSTREAM: ubi: fastmap: Implement produce_free_peb()

Since 'commit f82290afc847 ("mtd: ubi: Fix worker handling")',
when booting from NAND, on a fresh NAND just after being flashed (and
only in this

UPSTREAM: ubi: fastmap: Implement produce_free_peb()

Since 'commit f82290afc847 ("mtd: ubi: Fix worker handling")',
when booting from NAND, on a fresh NAND just after being flashed (and
only in this case), we got the following log:

ubi0: default fastmap pool size: 200
ubi0: default fastmap WL pool size: 100
ubi0: attaching mtd2
ubi0: scanning is finished
ubi0 error: ubi_update_fastmap: could not find any anchor PEB
ubi0 error: ubi_update_fastmap: could not find any anchor PEB
ubi0 error: ubi_wl_get_peb: Unable to get a free PEB from user WL pool
ubi0 error: autoresize: cannot auto-resize volume 1
UBI error: cannot attach mtd2UBI error: cannot initialize UBI, error
-28UBI init error 28

After analysis, in ubi_wl_init(), when performing schedule_erase(),
thread_enabled flag is not yet set to 1, which forbids ubi_do_worker()
to execute pending works.

This has to effect to not populate ubi->free with free physical
eraseblocks.

Following Richard Weinberger's advice, this patch has been
backported from kernel tree :
'commit 1cb8f9776c7d ("ubi: fastmap: Implement produce_free_peb()")'

Tested-by: Patrice Chotard <patrice.chotard@st.com>
Change-Id: I9ca7778757d9b578a75368a8e3fdbc990c3ed6dc
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Acked-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
(cherry picked from commit 65c3d25a6a21b5cf4d978f05f84aaeb6b250e636)

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UPSTREAM: ubi: Ensure no fastmap flush after uif_close

On detach UBI attempts to update fastmap after closing user interfaces
but at this point UBI volumes have already been free()'ed and fastmap
ca

UPSTREAM: ubi: Ensure no fastmap flush after uif_close

On detach UBI attempts to update fastmap after closing user interfaces
but at this point UBI volumes have already been free()'ed and fastmap
can no longer access these data structures.

Change-Id: I580c53b74539cd76d328e15c7c49ec54b5d67bf9
Signed-off-by: Martin Townsend <mtownsend1973@gmail.com>
Cc: hs@denx.de
Cc: kmpark@infradead.org
Cc: richard@sigma-star.at
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
(cherry picked from commit 2d2d306f79e5ae090790fd380662f5407ccace11)

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Merge branch 'master' of git://git.denx.de/u-boot

ubi,ubifs: sync with linux v4.2

sync with linux v4.2

commit 64291f7db5bd8150a74ad2036f1037e6a0428df2
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date: Sun Aug 30 11:34:09 2015 -0700

ubi,ubifs: sync with linux v4.2

sync with linux v4.2

commit 64291f7db5bd8150a74ad2036f1037e6a0428df2
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date: Sun Aug 30 11:34:09 2015 -0700

Linux 4.2

This update is needed, as it turned out, that fastmap
was in experimental/broken state in kernel v3.15, which
was the last base for U-Boot.

Signed-off-by: Heiko Schocher <hs@denx.de>
Tested-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>

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