From c94f156f63c835ffc02b686f9d4238b106f31a5d Mon Sep 17 00:00:00 2001
From: Stefan Roscher <ossrosch@linux.vnet.ibm.com>
Date: Wed, 13 May 2009 16:52:42 -0700
Subject: IB/ehca: Fall back to vmalloc() for big allocations

In case of large queue pairs there is the possibillity of allocation
failures due to memory fragmentation when using kmalloc().  To ensure
the memory is allocated even if kmalloc() can not find chunks which
are big enough, we fall back to allocating the memory with vmalloc().

Signed-off-by: Stefan Roscher <stefan.roscher@de.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/hw/ehca/ipz_pt_fn.c b/drivers/infiniband/hw/ehca/ipz_pt_fn.c
index a260559..1227c59 100644
--- a/drivers/infiniband/hw/ehca/ipz_pt_fn.c
+++ b/drivers/infiniband/hw/ehca/ipz_pt_fn.c
@@ -222,8 +222,11 @@ int ipz_queue_ctor(struct ehca_pd *pd, struct ipz_queue *queue,
 	/* allocate queue page pointers */
 	queue->queue_pages = kmalloc(nr_of_pages * sizeof(void *), GFP_KERNEL);
 	if (!queue->queue_pages) {
-		ehca_gen_err("Couldn't allocate queue page list");
-		return 0;
+		queue->queue_pages = vmalloc(nr_of_pages * sizeof(void *));
+		if (!queue->queue_pages) {
+			ehca_gen_err("Couldn't allocate queue page list");
+			return 0;
+		}
 	}
 	memset(queue->queue_pages, 0, nr_of_pages * sizeof(void *));
 
@@ -240,7 +243,10 @@ int ipz_queue_ctor(struct ehca_pd *pd, struct ipz_queue *queue,
 ipz_queue_ctor_exit0:
 	ehca_gen_err("Couldn't alloc pages queue=%p "
 		 "nr_of_pages=%x",  queue, nr_of_pages);
-	kfree(queue->queue_pages);
+	if (is_vmalloc_addr(queue->queue_pages))
+		vfree(queue->queue_pages);
+	else
+		kfree(queue->queue_pages);
 
 	return 0;
 }
@@ -262,7 +268,10 @@ int ipz_queue_dtor(struct ehca_pd *pd, struct ipz_queue *queue)
 			free_page((unsigned long)queue->queue_pages[i]);
 	}
 
-	kfree(queue->queue_pages);
+	if (is_vmalloc_addr(queue->queue_pages))
+		vfree(queue->queue_pages);
+	else
+		kfree(queue->queue_pages);
 
 	return 1;
 }
-- 
cgit v0.10.2