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Subject[PATCH 4.19 14/78] usb: dwc3: gadget: synchronize_irq dwc irq in suspend
Date
4.19-stable review patch.  If anyone has any objections, please let me know.

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

[ 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@intel.com>
Signed-off-by: Yu Wang <yu.y.wang@intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.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 0db90f6f4aa81..f6cd7feeb1c4f 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -3274,6 +3274,8 @@ 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


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