linux-kernel - Re: [PATCH v1] driver core: Fix handling of fw

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Date:   Mon, 30 Mar 2020 23:18:01 -0700
From:   Saravana Kannan <saravanak@...gle.com>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Android Kernel Team <kernel-team@...roid.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] driver core: Fix handling of fw_devlink=permissive

On Mon, Mar 30, 2020 at 10:43 PM Marek Szyprowski
<m.szyprowski@...sung.com> wrote:
>
> Hi,
>
> On 2020-03-31 04:28, Saravana Kannan wrote:
> > When commit 8375e74f2bca ("driver core: Add fw_devlink kernel
> > commandline option") added fw_devlink, it didn't implement "permissive"
> > mode correctly.
> >
> > That commit got the device links flags correct to make sure unprobed
> > suppliers don't block the probing of a consumer. However, if a consumer
> > is waiting for mandatory suppliers to register, that could still block a
> > consumer from probing.
> >
> > This commit fixes that by making sure in permissive mode, all suppliers
> > to a consumer are treated as a optional suppliers. So, even if a
> > consumer is waiting for suppliers to register and link itself (using the
> > DL_FLAG_SYNC_STATE_ONLY flag) to the supplier, the consumer is never
> > blocked from probing.
> >
> > Fixes: 8375e74f2bca ("driver core: Add fw_devlink kernel commandline option")
> > Reported-by: Marek Szyprowski <m.szyprowski@...sung.com>
> > Signed-off-by: Saravana Kannan <saravanak@...gle.com>
> > ---
> > Hi Marek,
> >
> > If you pull in this patch and then add back in my patch that created the
> > boot problem for you, can you see if that fixes the boot issue for you?
>
> Indeed, this fixes booting on my Raspberry Pi3/4 boards with linux
> next-20200327. Thanks! :)

Hi Marek,

Thanks for testing, but I'm not able to find the tag next-20200327. I
can only find next-20200326 and next-20200330. I was just trying to
make sure that next-20200327 doesn't have the revert Greg did. I'm
guessing you meant next-20200326?

> Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>

Thanks!

Greg,

Can you pull in my fix and then revert the revert?

Thanks,
Saravana