Am 11.06.2015 14:20, schrieb Dan Carpenter: > On Thu, Jun 11, 2015 at 02:03:18PM +0200, walter harms wrote: >> >> >> Am 11.06.2015 10:49, schrieb Dan Carpenter: >>> debugfs_create_file() can return an error pointer if debugfs is disabled >>> or it can return NULL on error. >>> >>> Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com> >>> >>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c >>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c >>> index 36be03c..adba2a1 100644 >>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c >>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c >>> @@ -1980,6 +1980,8 @@ static int amdgpu_debugfs_regs_init(struct >>> amdgpu_device *adev) >>> adev, &amdgpu_debugfs_regs_fops); >>> if (IS_ERR(ent)) >>> return PTR_ERR(ent); >>> + if (!ent) >>> + return -ENOMEM; >>> i_size_write(ent->d_inode, adev->rmmio_size); >>> adev->debugfs_regs = ent; >> >> >> >> would PTR_ERR_OR_ZERO() by an option ? >> >> on the other hand, >> why does debugfs_create_file() does not return -ENOMEN instead of NULL ? >> > > Actually if debugfs is disabled then we should probably carry on. Let > me change it to: > > if (IS_ERR(ent)) > return 0; > > if (!ent) > return -ENOMEM; >
You still have to check 2 types of error return here. I simply do not understand why ebugfs_create_file() does not return -ENOMEM (or returns NULL on any error). re, wh
