From 8b97d73c4d72a2abf58f8e49062a7ee1e5f1334e Mon Sep 17 00:00:00 2001
From: Loic Poulain <loic.poulain@linaro.org>
Date: Tue, 4 Sep 2018 17:18:57 +0200
Subject: [PATCH] usb: chipidea: Prevent unbalanced IRQ disable
Git-commit: 8b97d73c4d72a2abf58f8e49062a7ee1e5f1334e
Patch-mainline: v4.20-rc1
References: bsc#1051510

The ChipIdea IRQ is disabled before scheduling the otg work and
re-enabled on otg work completion. However if the job is already
scheduled we have to undo the effect of disable_irq int order to
balance the IRQ disable-depth value.

Fixes: be6b0c1bd0be ("usb: chipidea: using one inline function to cover queue work operations")
Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Signed-off-by: Peter Chen <peter.chen@nxp.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/usb/chipidea/otg.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/chipidea/otg.h b/drivers/usb/chipidea/otg.h
index 7e7428e48bfa..4f8b8179ec96 100644
--- a/drivers/usb/chipidea/otg.h
+++ b/drivers/usb/chipidea/otg.h
@@ -17,7 +17,8 @@ void ci_handle_vbus_change(struct ci_hdrc *ci);
 static inline void ci_otg_queue_work(struct ci_hdrc *ci)
 {
 	disable_irq_nosync(ci->irq);
-	queue_work(ci->wq, &ci->work);
+	if (queue_work(ci->wq, &ci->work) == false)
+		enable_irq(ci->irq);
 }
 
 #endif /* __DRIVERS_USB_CHIPIDEA_OTG_H */
-- 
2.19.1