From 111ab0b26fc1bfad575d1e376e146d194d261e22 Mon Sep 17 00:00:00 2001
From: Richard Weinberger <richard@nod.at>
Date: Mon, 10 Nov 2014 16:28:08 +0100
Subject: [PATCH] UBI: Fastmap: Locking updates

a) Rename ubi->fm_sem to ubi->fm_eba_sem as this semaphore
protects EBA changes.
b) Turn ubi->fm_mutex into a rw semaphore. It will still serialize
fastmap writes but also ensures that ubi_wl_put_peb() is not
interrupted by a fastmap write. We use a rw semaphore to allow
ubi_wl_put_peb() still to be executed in parallel if no fastmap
write is happening.

Signed-off-by: Richard Weinberger <richard@nod.at>
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