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Date:   Wed, 27 Feb 2019 22:33:20 +0800
From:   Yong Wu <>
To:     Evan Green <>
CC:     Joerg Roedel <>,
        Greg Kroah-Hartman <>,
        Matthias Brugger <>,
        Rob Herring <>,
        Robin Murphy <>,
        Tomasz Figa <>,
        Will Deacon <>,
        <>, LKML <>,
        <>, Arnd Bergmann <>,
        <>, <>,
        Nicolas Boichat <>
Subject: Re: [PATCH 02/13] driver core: Remove the link if there is no
 driver with AUTO flag

On Mon, 2019-02-25 at 15:53 -0800, Evan Green wrote:
> On Mon, Dec 31, 2018 at 8:52 PM Yong Wu <> wrote:
> >
> > automatically on consumer/supplier driver unbind", that means we should
> > remove whole the device_link when there is no this driver no matter what
> > the ref_count of the link is.
> >
> > CC: Greg Kroah-Hartman <>
> > Signed-off-by: Yong Wu <>
> > ---
> > The ref_count of our device_link normally is over 1. When the consumer
> > device driver is removed, whole the device_link should be removed.
> > Thus, I add this patch.
> > ---
> I will admit to reading about device links for the first time while
> reviewing this patch, but I don't really get this. Why use a kref at
> all if we're just going to ignore its value? For instance, I see that
> if you call device_link_add() with the same supplier and consumer, it
> uses the kref to return the same link. That machinery is broken with
> your change. Although I don't see any uses of it, you might also
> expect a supplier or consumer could do a kref_get() on the link it got
> back from device_link_add(), and have a reasonable expectation that
> the link wouldn't be freed out from under it. This would also be
> broken.
> Can you explain why your device_links normally have a reference count
> >1, 

I use device link between the smi-larb device and the iommu-consumer
device. Take a example, smi-larb1 have 4 VDEC ports. From 4/13 in this
patchset, we use device_link to link the VDEC device and the smi-larb1
device in the function(mtk_iommu_config). since there are 4 ports, it
will call device_link_add 4 times.

> and why those additional references can't be cleaned up in an
> orderly fashion?

If the iommu-consume device(like VDEC above) is removed, It should enter
device_links_driver_cleanup which only ref_put one time. I guess whole
the link should be removed at that time.

> (To be honest, I don't really understand the case for the AUTOREMOVE
> flags at all. Is there some case where the party that set up the link
> can't tear it down? Or is this a way to devm_ify the link, where devm
> itself doesn't work because the links themselves stall out that
> mechanism?)

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