[PATCH 4.19 158/361] usb: dwc2: fix call to vbus supply exit routine, call it unlocked

[Greg Kroah-Hartman]

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Fabrice Gasnier <fabrice.gasnier@xxxxxx>

[ 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@xxxxxxxxxxxx>
Acked-by: Minas Harutyunyan <hminas@xxxxxxxxxxxx>
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@xxxxxx>
Signed-off-by: Amelie Delaunay <amelie.delaunay@xxxxxx>
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/usb/dwc2/hcd.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -4482,7 +4482,9 @@ static int _dwc2_hcd_suspend(struct usb_
 		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 */