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arch/sh/mm: Eliminate a double lock

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The function begins and ends with a read_lock.  The latter is changed to a
read_unlock.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@locked@
expression E1;
position p;
@@

read_lock(E1@p,...);

@r exists@
expression x <= locked.E1;
expression locked.E1;
expression E2;
identifier lock;
position locked.p,p1,p2;
@@

*lock@p1 (E1@p,...);
... when != E1
    when != \(x = E2\|&x\)
*lock@p2 (E1,...);
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Acked-by: Matt Fleming <matt@console-pimps.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Julia Lawall 2010-06-20 11:24:54 +00:00 committed by Paul Mundt
parent 9973e38575
commit 0e6f989ba8
1 changed files with 1 additions and 1 deletions
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2
arch/sh/mm/pmb.c
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@ -770,7 +770,7 @@ static void __init pmb_resize(void)
spin_unlock_irqrestore(&pmbe->lock, flags);
}
read_lock(&pmb_rwlock);
read_unlock(&pmb_rwlock);
}
#endif