Commit 5e1341d1 authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds

[PATCH] Add SMP barrier to ipc's grow_ary()

From Dipanker Sarma.

Before setting the ids->entries to the new array, there must be a wmb()
to make sure that the memcpyed contents of the new array are visible
before the new array becomes visible.
parent ca22d5dd
No related merge requests found
...@@ -131,7 +131,13 @@ static int grow_ary(struct ipc_ids* ids, int newsize) ...@@ -131,7 +131,13 @@ static int grow_ary(struct ipc_ids* ids, int newsize)
} }
old = ids->entries; old = ids->entries;
i = ids->size; i = ids->size;
/*
* before setting the ids->entries to the new array, there must be a
* wmb() to make sure that the memcpyed contents of the new array are
* visible before the new array becomes visible.
*/
wmb();
ids->entries = new; ids->entries = new;
wmb(); wmb();
ids->size = newsize; ids->size = newsize;
......
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