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

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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: ff5f643de0 ("drm/imagination: Add GEM and VM related code")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Frank Binns <frank.binns@imgtec.com>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/13f4278e-af9c-4092-9196-bc0e6b76f1eb@moroto.mountain
This commit is contained in:
Dan Carpenter 2023-12-06 17:37:24 +03:00 committed by Maxime Ripard
parent b84135e7a5
commit fca9448ae2
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1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/imagination/pvr_mmu.c
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@ -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);