[PATCH] drm/imagination: Move dereference after NULL check in pvr_mmu_backing_page_init()

[Dan Carpenter]

This code dereferences "page->pvr_dev" and then checked for NULL on the
next line.  Re-order it to avoid a potential NULL pointer dereference.

Fixes: ff5f643de0bf ("drm/imagination: Add GEM and VM related code")
Signed-off-by: Dan Carpenter <dan.carpen...@linaro.org>
---
 drivers/gpu/drm/imagination/pvr_mmu.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/imagination/pvr_mmu.c 
b/drivers/gpu/drm/imagination/pvr_mmu.c
index c8562bfc0dcd..4fe70610ed94 100644
--- a/drivers/gpu/drm/imagination/pvr_mmu.c
+++ b/drivers/gpu/drm/imagination/pvr_mmu.c
@@ -316,12 +316,14 @@ pvr_mmu_backing_page_init(struct pvr_mmu_backing_page 
*page,
 static void
 pvr_mmu_backing_page_fini(struct pvr_mmu_backing_page *page)
 {
-       struct device *dev = from_pvr_device(page->pvr_dev)->dev;
+       struct device *dev;
 
        /* Do nothing if no allocation is present. */
        if (!page->pvr_dev)
                return;
 
+       dev = from_pvr_device(page->pvr_dev)->dev;
+
        dma_unmap_page(dev, page->dma_addr, PVR_MMU_BACKING_PAGE_SIZE,
                       DMA_TO_DEVICE);
 
-- 
2.42.0