[PATCH 4.4 034/115] dmaengine: Fix array index out of bounds warning in __get_unmap_pool()

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Matthias Kaehlcke <m...@chromium.org>


[ Upstream commit 23f963e91fd81f44f6b316b1c24db563354c6be8 ]

This fixes the following warning when building with clang and
CONFIG_DMA_ENGINE_RAID=n :

drivers/dma/dmaengine.c:1102:11: error: array index 2 is past the end of the 
array (which contains 1 element) [-Werror,-Warray-bounds]
                return &unmap_pool[2];
                        ^          ~
drivers/dma/dmaengine.c:1083:1: note: array 'unmap_pool' declared here
static struct dmaengine_unmap_pool unmap_pool[] = {
^
drivers/dma/dmaengine.c:1104:11: error: array index 3 is past the end of the 
array (which contains 1 element) [-Werror,-Warray-bounds]
                return &unmap_pool[3];
                        ^          ~
drivers/dma/dmaengine.c:1083:1: note: array 'unmap_pool' declared here
static struct dmaengine_unmap_pool unmap_pool[] = {

Signed-off-by: Matthias Kaehlcke <m...@chromium.org>
Reviewed-by: Dan Williams <dan.j.willi...@intel.com>
Signed-off-by: Vinod Koul <vinod.k...@intel.com>
Signed-off-by: Sasha Levin <alexander.le...@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/dma/dmaengine.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -1023,12 +1023,14 @@ static struct dmaengine_unmap_pool *__ge
        switch (order) {
        case 0 ... 1:
                return &unmap_pool[0];
+#if IS_ENABLED(CONFIG_DMA_ENGINE_RAID)
        case 2 ... 4:
                return &unmap_pool[1];
        case 5 ... 7:
                return &unmap_pool[2];
        case 8:
                return &unmap_pool[3];
+#endif
        default:
                BUG();
                return NULL;