linux-kernel - [PATCH v2] usb: dwc2: call dwc2_is_controller

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Message-id: <1421217931-23722-1-git-send-email-r.baldyga@samsung.com>
Date:	Wed, 14 Jan 2015 07:45:31 +0100
From:	Robert Baldyga <r.baldyga@...sung.com>
To:	paulz@...opsys.com
Cc:	balbi@...com, gregkh@...uxfoundation.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	dinguyen@...nsource.altera.com, yousaf.kaukab@...el.com,
	m.szyprowski@...sung.com, Robert Baldyga <r.baldyga@...sung.com>
Subject: [PATCH v2] usb: dwc2: call dwc2_is_controller_alive() under spinlock

This patch fixes bug described here:
https://lkml.org/lkml/2014/12/22/185

Signed-off-by: Robert Baldyga <r.baldyga@...sung.com>
---

Changelog:

v2:
- fixed comment from Paul Zimmerman

v1: https://lkml.org/lkml/2015/1/13/186

 drivers/usb/dwc2/core_intr.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/dwc2/core_intr.c b/drivers/usb/dwc2/core_intr.c
index ad43c5b..02e3e2d 100644
--- a/drivers/usb/dwc2/core_intr.c
+++ b/drivers/usb/dwc2/core_intr.c
@@ -476,13 +476,13 @@ irqreturn_t dwc2_handle_common_intr(int irq, void *dev)
 	u32 gintsts;
 	irqreturn_t retval = IRQ_NONE;
 
+	spin_lock(&hsotg->lock);
+
 	if (!dwc2_is_controller_alive(hsotg)) {
 		dev_warn(hsotg->dev, "Controller is dead\n");
 		goto out;
 	}
 
-	spin_lock(&hsotg->lock);
-
 	gintsts = dwc2_read_common_intr(hsotg);
 	if (gintsts & ~GINTSTS_PRTINT)
 		retval = IRQ_HANDLED;
@@ -515,8 +515,8 @@ irqreturn_t dwc2_handle_common_intr(int irq, void *dev)
 		}
 	}
 
-	spin_unlock(&hsotg->lock);
 out:
+	spin_unlock(&hsotg->lock);
 	return retval;
 }
 EXPORT_SYMBOL_GPL(dwc2_handle_common_intr);
-- 
1.9.1

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