[AUTOSEL,4.4,26/32] usb: chipidea: Prevent unbalanced IRQ disable

Message ID 20181031231137.29429-26-sashal@kernel.org
State New
Headers show
Series
  • Untitled series #15919
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Commit Message

Sasha Levin Oct. 31, 2018, 11:11 p.m.
From: Loic Poulain <loic.poulain@linaro.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@linaro.org>

Signed-off-by: Peter Chen <peter.chen@nxp.com>

Signed-off-by: Sasha Levin <sashal@kernel.org>

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

-- 
2.17.1

Patch

diff --git a/drivers/usb/chipidea/otg.h b/drivers/usb/chipidea/otg.h
index 9ecb598e48f0..a5557c70034a 100644
--- a/drivers/usb/chipidea/otg.h
+++ b/drivers/usb/chipidea/otg.h
@@ -20,7 +20,8 @@  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 */