drivers/gpu/drm: Use kmemdup

Use kmemdup when some other buffer is immediately copied into the
allocated region.

A simplified version of the semantic patch that makes this change is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression from,to,size,flag;
statement S;
@@

-  to = \(kmalloc\|kzalloc\)(size,flag);
+  to = kmemdup(from,size,flag);
   if (to==NULL || ...) S
-  memcpy(to, from, size);
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Dave Airlie <airlied@redhat.com>

2 files changed, 3 insertions, 6 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_grctx.c b/drivers/gpu/drm/nouveau/nouveau_grctx.c
index 32f0e495464c..f731c5f60536 100644
--- a/drivers/gpu/drm/nouveau/nouveau_grctx.c
+++ b/drivers/gpu/drm/nouveau/nouveau_grctx.c
@@ -68,13 +68,12 @@ nouveau_grctx_prog_load(struct drm_device *dev)
                         return ret;
                 }
 
-                pgraph->ctxprog = kmalloc(fw->size, GFP_KERNEL);
+                pgraph->ctxprog = kmemdup(fw->data, fw->size, GFP_KERNEL);
                 if (!pgraph->ctxprog) {
                         NV_ERROR(dev, "OOM copying ctxprog\n");
                         release_firmware(fw);
                         return -ENOMEM;
                 }
-                memcpy(pgraph->ctxprog, fw->data, fw->size);
 
                 cp = pgraph->ctxprog;
                 if (le32_to_cpu(cp->signature) != 0x5043564e ||
@@ -97,14 +96,13 @@ nouveau_grctx_prog_load(struct drm_device *dev)
                         return ret;
                 }
 
-                pgraph->ctxvals = kmalloc(fw->size, GFP_KERNEL);
+                pgraph->ctxvals = kmemdup(fw->data, fw->size, GFP_KERNEL);
                 if (!pgraph->ctxvals) {
                         NV_ERROR(dev, "OOM copying ctxvals\n");
                         release_firmware(fw);
                         nouveau_grctx_fini(dev);
                         return -ENOMEM;
                 }
-                memcpy(pgraph->ctxvals, fw->data, fw->size);
 
                 cv = (void *)pgraph->ctxvals;
                 if (le32_to_cpu(cv->signature) != 0x5643564e ||
diff --git a/drivers/gpu/drm/radeon/radeon_bios.c b/drivers/gpu/drm/radeon/radeon_bios.c
index 8ad71f701316..fbba938f8048 100644
--- a/drivers/gpu/drm/radeon/radeon_bios.c
+++ b/drivers/gpu/drm/radeon/radeon_bios.c
@@ -85,12 +85,11 @@ static bool radeon_read_bios(struct radeon_device *rdev)
                 pci_unmap_rom(rdev->pdev, bios);
                 return false;
         }
-        rdev->bios = kmalloc(size, GFP_KERNEL);
+        rdev->bios = kmemdup(bios, size, GFP_KERNEL);
         if (rdev->bios == NULL) {
                 pci_unmap_rom(rdev->pdev, bios);
                 return false;
         }
-        memcpy(rdev->bios, bios, size);
         pci_unmap_rom(rdev->pdev, bios);
         return true;
 }