linux-kernel - [PATCH AUTOSEL 4.9 05/27] usb: dwc3: gadget: synchronize

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Message-Id: <20190215021424.178979-5-sashal@kernel.org>
Date:   Thu, 14 Feb 2019 21:14:02 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Bo He <bo.he@...el.com>, Yu Wang <yu.y.wang@...el.com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Sasha Levin <sashal@...nel.org>, linux-usb@...r.kernel.org
Subject: [PATCH AUTOSEL 4.9 05/27] usb: dwc3: gadget: synchronize_irq dwc irq in suspend

From: Bo He <bo.he@...el.com>

[ Upstream commit 01c10880d24291a96a4ab0da773e3c5ce4d12da8 ]

We see dwc3 endpoint stopped by unwanted irq during
suspend resume test, which is caused dwc3 ep can't be started
with error "No Resource".

Here, add synchronize_irq before suspend to sync the
pending IRQ handlers complete.

Signed-off-by: Bo He <bo.he@...el.com>
Signed-off-by: Yu Wang <yu.y.wang@...el.com>
Signed-off-by: Felipe Balbi <felipe.balbi@...ux.intel.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/dwc3/gadget.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index ed6b9bfe3759..c481df18a5a1 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -3096,6 +3096,8 @@ int dwc3_gadget_suspend(struct dwc3 *dwc)
 	dwc3_disconnect_gadget(dwc);
 	__dwc3_gadget_stop(dwc);
 
+	synchronize_irq(dwc->irq_gadget);
+
 	return 0;
 }
 
-- 
2.19.1