linux-kernel - [PATCH AUTOSEL 4.19 114/146] usb: dwc2: fix call to vbus supply exit routine, call it unlocked

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Message-Id: <20181031230541.28822-114-sashal@kernel.org>
Date:   Wed, 31 Oct 2018 19:05:09 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Fabrice Gasnier <fabrice.gasnier@...com>,
        Amelie Delaunay <amelie.delaunay@...com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.19 114/146] usb: dwc2: fix call to vbus supply exit routine, call it unlocked

From: Fabrice Gasnier <fabrice.gasnier@...com>

[ Upstream commit 5aa678c7fd5371769efde30763fb43a43a118cd0 ]

dwc2_vbus_supply_exit() may call regulator_disable(). It shouldn't be
called with interrupts disabled as it might sleep.
This is seen with DEBUG_ATOMIC_SLEEP=y.

Fixes: 531ef5ebea96 ("usb: dwc2: add support for host mode external
vbus supply")

Tested-by: Artur Petrosyan <arturp@...opsys.com>
Acked-by: Minas Harutyunyan <hminas@...opsys.com>
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...com>
Signed-off-by: Amelie Delaunay <amelie.delaunay@...com>
Signed-off-by: Felipe Balbi <felipe.balbi@...ux.intel.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/dwc2/hcd.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index 2bd6e6bfc241..befaf1e9d98a 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -4482,7 +4482,9 @@ static int _dwc2_hcd_suspend(struct usb_hcd *hcd)
 		hprt0 |= HPRT0_SUSP;
 		hprt0 &= ~HPRT0_PWR;
 		dwc2_writel(hsotg, hprt0, HPRT0);
+		spin_unlock_irqrestore(&hsotg->lock, flags);
 		dwc2_vbus_supply_exit(hsotg);
+		spin_lock_irqsave(&hsotg->lock, flags);
 	}
 
 	/* Enter partial_power_down */
-- 
2.17.1