linux-kernel - Re: [PATCH 1/1] thunderbolt: add trivial .shutdown

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Date:   Mon, 25 May 2020 11:53:25 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Maxim Levitsky <mlevitsk@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Jiri Kosina <trivial@...nel.org>,
        "open list:THUNDERBOLT DRIVER" <linux-usb@...r.kernel.org>,
        Yehezkel Bernat <YehezkelShB@...il.com>
Subject: Re: [PATCH 1/1] thunderbolt: add trivial .shutdown

On Wed, May 20, 2020 at 09:52:21PM +0300, Maxim Levitsky wrote:
> On my machine, a kexec with this driver loaded in the old kernel
> causes a very long delay on boot in the kexec'ed kernel,
> most likely due to unclean shutdown prior to that.
> 
> Unloading thunderbolt driver prior to kexec allows kexec to work as fast
> as regular kernel boot, as well as adding this .shutdown pointer.
> 
> Shutting a device prior to the shutdown completely is always
> a good idea IMHO to help with kexec,
> and this one-liner patch implements it.
> 
> Signed-off-by: Maxim Levitsky <mlevitsk@...hat.com>
> ---
>  drivers/thunderbolt/nhi.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c
> index 1be491ecbb45..4046642e6aec 100644
> --- a/drivers/thunderbolt/nhi.c
> +++ b/drivers/thunderbolt/nhi.c
> @@ -1285,6 +1285,7 @@ static struct pci_driver nhi_driver = {
>  	.id_table = nhi_ids,
>  	.probe = nhi_probe,
>  	.remove = nhi_remove,
> +	.shutdown = nhi_remove,

I guess nhi_remove() does a bit more work than strictly required for
.shutdown but we can deal with that later if needed.

Applied to thunderbolt.git/next, thanks!