linux-kernel - [PATCH AUTOSEL 4.19 129/146] usb: chipidea: Prevent unbalanced IRQ disable

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Message-Id: <20181031230541.28822-129-sashal@kernel.org>
Date:   Wed, 31 Oct 2018 19:05:24 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Loic Poulain <loic.poulain@...aro.org>,
        Peter Chen <peter.chen@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.19 129/146] usb: chipidea: Prevent unbalanced IRQ disable

From: Loic Poulain <loic.poulain@...aro.org>

[ Upstream commit 8b97d73c4d72a2abf58f8e49062a7ee1e5f1334e ]

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@...aro.org>
Signed-off-by: Peter Chen <peter.chen@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 */
-- 
2.17.1