Re: [PATCH] amdgpu/uvd: use kmemdup

From: Christian KÃnig
Date: Thu May 19 2016 - 07:18:36 EST


Am 19.05.2016 um 13:11 schrieb Muhammad Falak R Wani:
Use kmemdup when some other buffer is immediately copied into allocated
region. It replaces call to allocation followed by memcpy, by a single
call to kmemdup.

Signed-off-by: Muhammad Falak R Wani <falakreyaz@xxxxxxxxx>

NAK, actually using memcpy() is wrong in the first place.

The UVD BO is in VRAM so the pointer is pointing to IO memory here, so this should be memcpy_fromio() instead of memcpy().

Christian.

---
drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c
index 01abfc2..c977ab6 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c
@@ -295,12 +295,10 @@ int amdgpu_uvd_suspend(struct amdgpu_device *adev)
size = amdgpu_bo_size(adev->uvd.vcpu_bo);
ptr = adev->uvd.cpu_addr;
- adev->uvd.saved_bo = kmalloc(size, GFP_KERNEL);
+ adev->uvd.saved_bo = kmemdup(ptr, size, GFP_KERNEL);
if (!adev->uvd.saved_bo)
return -ENOMEM;
- memcpy(adev->uvd.saved_bo, ptr, size);
-
return 0;
}