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commit 513f7f747e upstream.
Sven noticed that calling ioremap() and iounmap() multiple times leads
to a vmap memory leak:
vmap allocation for size 4198400 failed:
use vmalloc=<size> to increase size
It seems we missed calling vunmap() in iounmap().
Signed-off-by: Helge Deller <deller@gmx.de>
Noticed-by: Sven Schnelle <svens@stackframe.org>
Cc: <stable@vger.kernel.org> # v3.16+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>