commit f86c9747fe1cd72b2c5c6bdf72d17aeb2a3c6cb0
author Sonny Rao <sonny@burdell.org> Tue Jun 27 08:46:09 2006 -0400
committer Paul Mackerras <paulus@samba.org> Thu Jun 29 16:22:46 2006 +1000
tree c32ef71ff0e535a467e428d3d874b65232f76708
parent 975b365895b638a62da55f9fb180b0a71d05874d

[POWERPC] Fix idr locking in init_new_context

We always need to serialize accesses to mmu_context_idr.

I hit this bug when testing with a small number of mmu contexts.

Signed-off-by: Sonny Rao <sonny@burdell.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/mm/mmu_context_64.c

diff --git a/arch/powerpc/mm/mmu_context_64.c b/arch/powerpc/mm/mmu_context_64.c
index 65d18dc..e2051ef 100644
--- a/arch/powerpc/mm/mmu_context_64.c
+++ b/arch/powerpc/mm/mmu_context_64.c
@@ -44,7 +44,9 @@
 		return err;
 
 	if (index > MAX_CONTEXT) {
+		spin_lock(&mmu_context_lock);
 		idr_remove(&mmu_context_idr, index);
+		spin_unlock(&mmu_context_lock);
 		return -ENOMEM;
 	}