linux-kernel - [PATCH 4.19 043/133] Revert "usb/ehci-platform: Set PM runtime as active on resume"

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Message-Id: <20200720152805.805310184@linuxfoundation.org>
Date:   Mon, 20 Jul 2020 17:36:30 +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, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 043/133] Revert "usb/ehci-platform: Set PM runtime as active on resume"

This reverts commit 71f660a1a74b2eae7896f18f31b68e9c4f4eaea3.

Eugeniu Rosca writes:

On Thu, Jul 09, 2020 at 09:00:23AM +0200, Eugeniu Rosca wrote:
>After integrating v4.14.186 commit 5410d158ca2a50 ("usb/ehci-platform:
>Set PM runtime as active on resume") into downstream v4.14.x, we started
>to consistently experience below panic [1] on every second s2ram of
>R-Car H3 Salvator-X Renesas reference board.
>
>After some investigations, we concluded the following:
> - the issue does not exist in vanilla v5.8-rc4+
> - [bisecting shows that] the panic on v4.14.186 is caused by the lack
>   of v5.6-rc1 commit 987351e1ea7772 ("phy: core: Add consumer device
>   link support"). Getting evidence for that is easy. Reverting
>   987351e1ea7772 in vanilla leads to a similar backtrace [2].
>
>Questions:
> - Backporting 987351e1ea7772 ("phy: core: Add consumer device
>   link support") to v4.14.187 looks challenging enough, so probably not
>   worth it. Anybody to contradict this?
> - Assuming no plans to backport the missing mainline commit to v4.14.x,
>   should the following three v4.14.186 commits be reverted on v4.14.x?
>   * baef809ea497a4 ("usb/ohci-platform: Fix a warning when hibernating")
>   * 9f33eff4958885 ("usb/xhci-plat: Set PM runtime as active on resume")
>   * 5410d158ca2a50 ("usb/ehci-platform: Set PM runtime as active on resume")

Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/host/ehci-platform.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
index cbc45941a699d..8a45362155c5a 100644
--- a/drivers/usb/host/ehci-platform.c
+++ b/drivers/usb/host/ehci-platform.c
@@ -457,10 +457,6 @@ static int ehci_platform_resume(struct device *dev)
 
 	ehci_resume(hcd, priv->reset_on_resume);
 
-	pm_runtime_disable(dev);
-	pm_runtime_set_active(dev);
-	pm_runtime_enable(dev);
-
 	if (priv->quirk_poll)
 		quirk_poll_init(priv);
 
-- 
2.25.1