[Cbe-oss-dev] [PATCH 17/21] spufs: spu_find_victim may choose wrong victim

[Jeremy Kerr]

From: Luke Browning <lukebr at linux.vnet.ibm.com>

Need to re-check priority after dropping lock.  Otherwise, a
more favored context may be preempted.

Signed-off-by: Luke Browning <lukebr at linux.vnet.ibm.com>
Signed-off-by: Jeremy Kerr <jk at ozlabs.org>

---
 arch/powerpc/platforms/cell/spufs/sched.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/platforms/cell/spufs/sched.c b/arch/powerpc/platforms/cell/spufs/sched.c
index ef0e5e2..54b338f 100644
--- a/arch/powerpc/platforms/cell/spufs/sched.c
+++ b/arch/powerpc/platforms/cell/spufs/sched.c
@@ -626,10 +626,10 @@ static struct spu *find_victim(struct spu_context *ctx)
 			}
 
 			spu = victim->spu;
-			if (!spu) {
+			if (!spu || victim->prio <= ctx->prio) {
 				/*
 				 * This race can happen because we've dropped
-				 * the active list mutex.  No a problem, just
+				 * the active list mutex.  Not a problem, just
 				 * restart the search.
 				 */
 				mutex_unlock(&victim->state_mutex);