From: Sonny Rao <sonny@burdell.org>
Date: Tue, 27 Jun 2006 12:46:09 +0000 (-0400)
Subject: [POWERPC] Fix idr locking in init_new_context
X-Git-Tag: v2.6.18-rc1~358^2~5
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f86c9747fe1cd72b2c5c6bdf72d17aeb2a3c6cb0;p=linux-2.6

[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>
---

diff --git a/arch/powerpc/mm/mmu_context_64.c b/arch/powerpc/mm/mmu_context_64.c
index 65d18dca26..e2051efa09 100644
--- a/arch/powerpc/mm/mmu_context_64.c
+++ b/arch/powerpc/mm/mmu_context_64.c
@@ -44,7 +44,9 @@ again:
 		return err;
 
 	if (index > MAX_CONTEXT) {
+		spin_lock(&mmu_context_lock);
 		idr_remove(&mmu_context_idr, index);
+		spin_unlock(&mmu_context_lock);
 		return -ENOMEM;
 	}