linux-kernel - [PATCH] usb: gadget: r8a66597-udc: do not unlock unheld spinlock in r8a66597_sudmac

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Date:	Thu, 30 May 2013 00:51:37 +0400
From:	Alexey Khoroshilov <khoroshilov@...ras.ru>
To:	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	Felipe Balbi <balbi@...com>
Cc:	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	ldv-project@...uxtesting.org
Subject: [PATCH] usb: gadget: r8a66597-udc: do not unlock unheld spinlock in r8a66597_sudmac_irq()

r8a66597_irq() processes sudmac part (r8a66597_sudmac_irq()) before locking r8a66597->lock.
But transfer_complete(), that is called inside (r8a66597_sudmac_irq()->sudmac_finish()->transfer_complete()),
expects r8a66597->lock is locked. As a result unheld spinlock can be unlocked.

The patch just moves locking before calling r8a66597_sudmac_irq().

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
---
 drivers/usb/gadget/r8a66597-udc.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/r8a66597-udc.c b/drivers/usb/gadget/r8a66597-udc.c
index 7ff7d9c..2dd213c 100644
--- a/drivers/usb/gadget/r8a66597-udc.c
+++ b/drivers/usb/gadget/r8a66597-udc.c
@@ -1469,11 +1469,11 @@ static irqreturn_t r8a66597_irq(int irq, void *_r8a66597)
 	u16 savepipe;
 	u16 mask0;
 
+	spin_lock(&r8a66597->lock);
+
 	if (r8a66597_is_sudmac(r8a66597))
 		r8a66597_sudmac_irq(r8a66597);
 
-	spin_lock(&r8a66597->lock);
-
 	intsts0 = r8a66597_read(r8a66597, INTSTS0);
 	intenb0 = r8a66597_read(r8a66597, INTENB0);
 
-- 
1.7.9.5

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