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

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Message-Id: <20200520185221.122283-2-mlevitsk@redhat.com>
Date:   Wed, 20 May 2020 21:52:21 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Jiri Kosina <trivial@...nel.org>,
        linux-usb@...r.kernel.org (open list:THUNDERBOLT DRIVER),
        Yehezkel Bernat <YehezkelShB@...il.com>,
        Maxim Levitsky <mlevitsk@...hat.com>
Subject: [PATCH 1/1] thunderbolt: add trivial .shutdown

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,
 	.driver.pm = &nhi_pm_ops,
 };
 
-- 
2.25.4