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Date: Mon, 13 Jun 2022 12:10:21 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, John Stultz <jstultz@...gle.com>,
"David S. Miller" <davem@...emloft.net>,
Alexey Kuznetsov <kuznet@....inr.ac.ru>,
Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
Jakub Kicinski <kuba@...nel.org>,
Rob Herring <robh@...nel.org>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
Robin Murphy <robin.murphy@....com>,
Andy Shevchenko <andy.shevchenko@...il.com>,
Sudeep Holla <sudeep.holla@....com>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Naresh Kamboju <naresh.kamboju@...aro.org>,
Basil Eljuse <Basil.Eljuse@....com>,
Ferry Toth <fntoth@...il.com>, Arnd Bergmann <arnd@...db.de>,
Anders Roxell <anders.roxell@...aro.org>,
linux-pm@...r.kernel.org, Nathan Chancellor <nathan@...nel.org>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
Geert Uytterhoeven <geert+renesas@...der.be>,
Saravana Kannan <saravanak@...gle.com>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.17 127/298] driver core: Fix wait_for_device_probe() & deferred_probe_timeout interaction
From: Saravana Kannan <saravanak@...gle.com>
[ Upstream commit 5ee76c256e928455212ab759c51d198fedbe7523 ]
Mounting NFS rootfs was timing out when deferred_probe_timeout was
non-zero [1]. This was because ip_auto_config() initcall times out
waiting for the network interfaces to show up when
deferred_probe_timeout was non-zero. While ip_auto_config() calls
wait_for_device_probe() to make sure any currently running deferred
probe work or asynchronous probe finishes, that wasn't sufficient to
account for devices being deferred until deferred_probe_timeout.
Commit 35a672363ab3 ("driver core: Ensure wait_for_device_probe() waits
until the deferred_probe_timeout fires") tried to fix that by making
sure wait_for_device_probe() waits for deferred_probe_timeout to expire
before returning.
However, if wait_for_device_probe() is called from the kernel_init()
context:
- Before deferred_probe_initcall() [2], it causes the boot process to
hang due to a deadlock.
- After deferred_probe_initcall() [3], it blocks kernel_init() from
continuing till deferred_probe_timeout expires and beats the point of
deferred_probe_timeout that's trying to wait for userspace to load
modules.
Neither of this is good. So revert the changes to
wait_for_device_probe().
[1] - https://lore.kernel.org/lkml/TYAPR01MB45443DF63B9EF29054F7C41FD8C60@TYAPR01MB4544.jpnprd01.prod.outlook.com/
[2] - https://lore.kernel.org/lkml/YowHNo4sBjr9ijZr@dev-arch.thelio-3990X/
[3] - https://lore.kernel.org/lkml/Yo3WvGnNk3LvLb7R@linutronix.de/
Fixes: 35a672363ab3 ("driver core: Ensure wait_for_device_probe() waits until the deferred_probe_timeout fires")
Cc: John Stultz <jstultz@...gle.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Alexey Kuznetsov <kuznet@....inr.ac.ru>
Cc: Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Rob Herring <robh@...nel.org>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Cc: Robin Murphy <robin.murphy@....com>
Cc: Andy Shevchenko <andy.shevchenko@...il.com>
Cc: Sudeep Holla <sudeep.holla@....com>
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Naresh Kamboju <naresh.kamboju@...aro.org>
Cc: Basil Eljuse <Basil.Eljuse@....com>
Cc: Ferry Toth <fntoth@...il.com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Anders Roxell <anders.roxell@...aro.org>
Cc: linux-pm@...r.kernel.org
Reported-by: Nathan Chancellor <nathan@...nel.org>
Reported-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Tested-by: Geert Uytterhoeven <geert+renesas@...der.be>
Acked-by: John Stultz <jstultz@...gle.com>
Signed-off-by: Saravana Kannan <saravanak@...gle.com>
Link: https://lore.kernel.org/r/20220526034609.480766-2-saravanak@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Reviewed-by: Rafael J. Wysocki <rafael@...nel.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/base/dd.c | 5 -----
1 file changed, 5 deletions(-)
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 977e94cf669e..86fd2ea35656 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -257,7 +257,6 @@ DEFINE_SHOW_ATTRIBUTE(deferred_devs);
int driver_deferred_probe_timeout;
EXPORT_SYMBOL_GPL(driver_deferred_probe_timeout);
-static DECLARE_WAIT_QUEUE_HEAD(probe_timeout_waitqueue);
static int __init deferred_probe_timeout_setup(char *str)
{
@@ -312,7 +311,6 @@ static void deferred_probe_timeout_work_func(struct work_struct *work)
list_for_each_entry(p, &deferred_probe_pending_list, deferred_probe)
dev_info(p->device, "deferred probe pending\n");
mutex_unlock(&deferred_probe_mutex);
- wake_up_all(&probe_timeout_waitqueue);
}
static DECLARE_DELAYED_WORK(deferred_probe_timeout_work, deferred_probe_timeout_work_func);
@@ -720,9 +718,6 @@ int driver_probe_done(void)
*/
void wait_for_device_probe(void)
{
- /* wait for probe timeout */
- wait_event(probe_timeout_waitqueue, !driver_deferred_probe_timeout);
-
/* wait for the deferred probe workqueue to finish */
flush_work(&deferred_probe_work);
--
2.35.1
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