From: Jack Steiner <steiner@sgi.com>

Don't allow users to create GRU contexts with 0 CBRs. This does
not make sense & is not allowed by the chiplet. The chiplet will flag this
as an error and fail to allocate the context.

Signed-off-by: Jack Steiner <steiner@sgi.com>

---
 drivers/misc/sgi-gru/grufile.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux/drivers/misc/sgi-gru/grufile.c
===================================================================
--- linux.orig/drivers/misc/sgi-gru/grufile.c	2010-06-09 08:11:46.261068458 -0500
+++ linux/drivers/misc/sgi-gru/grufile.c	2010-06-09 08:11:47.151963284 -0500
@@ -175,7 +175,7 @@ static int gru_create_new_context(unsign
 
 	if (req.data_segment_bytes > max_user_dsr_bytes)
 		return -EINVAL;
-	if (req.control_blocks > max_user_cbrs || !req.maximum_thread_count)
+	if (req.control_blocks == 0 || req.control_blocks > max_user_cbrs || !req.maximum_thread_count)
 		return -EINVAL;
 
 	if (!(req.options & GRU_OPT_MISS_MASK))

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