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SubjectRe: [PATCH] base: core: Remove WARN_ON from link dependencies check
On Thu, Jul 12, 2018 at 10:06:23AM +0200, Benjamin Gaignard wrote:
> In some cases the link between between customer and supplier
> already exist. Do not warn about already existing dependencies
> because device_link_add() take care of this case.

Why would a link already exist that is asked to be created again? What
code path causes this?

>
> Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
> ---
> drivers/base/core.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/base/core.c b/drivers/base/core.c
> index df3e1a44707a..fcdc17f0f349 100644
> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -105,7 +105,7 @@ static int device_is_dependent(struct device *dev, void *target)
> struct device_link *link;
> int ret;
>
> - if (WARN_ON(dev == target))
> + if (dev == target)
> return 1;
>
> ret = device_for_each_child(dev, target, device_is_dependent);
> @@ -113,7 +113,7 @@ static int device_is_dependent(struct device *dev, void *target)
> return ret;
>
> list_for_each_entry(link, &dev->links.consumers, s_node) {
> - if (WARN_ON(link->consumer == target))
> + if (link->consumer == target)
> return 1;

Both of these WARN_ON are for valid code? That feels really odd to me,
I need more explanation here please.

thanks,

greg k-h
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