On Mon, Feb 12, 2018 at 06:43:09PM +0800, Yisheng Xie wrote:
> If we failed to create debugfs for ion at ion_device_create, the
> debug_root of ion_device will be NULL, and then when try to create debug
> file for shrinker of heap it will be create on the top of debugfs. If we
> also failed to create this the debug file, it call dentry_path to found
> the path of debug_root, then a NULL point will occur.
>
> Fix this by avoiding call dentry_path, but show the debug name only when
> failed to create debug file for shrinker.
>
> Acked-by: Laura Abbott <labbott@xxxxxxxxxx>
> Signed-off-by: Yisheng Xie <xieyisheng1@xxxxxxxxxx>
> ---
> drivers/staging/android/ion/ion.c | 10 +++-------
> 1 file changed, 3 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
> index 57e0d80..4b69372 100644
> --- a/drivers/staging/android/ion/ion.c
> +++ b/drivers/staging/android/ion/ion.c
> @@ -564,13 +564,9 @@ void ion_device_add_heap(struct ion_heap *heap)
> debug_file = debugfs_create_file(debug_name,
> 0644, dev->debug_root, heap,
> &debug_shrink_fops);
> - if (!debug_file) {
> - char buf[256], *path;
> -
> - path = dentry_path(dev->debug_root, buf, 256);
> - pr_err("Failed to create heap shrinker debugfs at %s/%s\n",
> - path, debug_name);
> - }
> + if (!debug_file)
> + pr_err("Failed to create ion heap shrinker debugfs at %s\n",
> + debug_name);
Really we can just remove this, there's no need to check the return
value of this debugfs call at all, it doesn't matter.
thanks,
greg k-h
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