linux-kernel - Re: [PATCH v2 15/28] thunderbolt: Deactivate all paths before restarting them

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Message-ID: <20190211063555.2bozvqen2jmskox4@wunner.de>
Date:   Mon, 11 Feb 2019 07:35:55 +0100
From:   Lukas Wunner <lukas@...ner.de>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org,
        Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>,
        Andreas Noever <andreas.noever@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH v2 15/28] thunderbolt: Deactivate all paths before
 restarting them

On Wed, Feb 06, 2019 at 04:17:25PM +0300, Mika Westerberg wrote:
> We can't be sure the paths are actually properly deactivated when a
> tunnel is restarted after resume.

Why can't we be sure?  Please provide proper reasoning.

> So instead of marking all paths as
> inactive we go ahead and deactivate them explicitly.

This seems like a bad idea if the root partition is on a Thunderbolt-
attached drive, the system is waking from hibernate and the EFI NHI
driver has already established a tunnel to that drive.  It would seem
more appropriate to discover tunnels already existing on resume from
system sleep and then attempt to establish any others that might be
missing.

> @@ -183,8 +183,15 @@ int tb_tunnel_restart(struct tb_tunnel *tunnel)
>  
>  	tb_tunnel_info(tunnel, "activating\n");
>  
> +	/* Make sure all paths are properly disabled before enable them again */

This isn't proper English, s/enable/enabling/.

Thanks,

Lukas