linux-kernel - [PATCH 3.13 120/172] usb: chipidea: need to mask when writting endptflush and endptprime

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Date:	Tue,  4 Mar 2014 12:03:24 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Peter Chen <peter.chen@...escale.com>,
	Matthieu CASTET <matthieu.castet@...rot.com>,
	Michael Grzeschik <mgrzeschik@...gutronix.de>
Subject: [PATCH 3.13 120/172] usb: chipidea: need to mask when writting endptflush and endptprime

3.13-stable review patch.  If anyone has any objections, please let me know.

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

From: Matthieu CASTET <matthieu.castet@...rot.com>

commit 5bf5dbeda2454296f1984adfbfc8e6f5965ac389 upstream.

ENDPTFLUSH and ENDPTPRIME registers are set by software and clear
by hardware. There is a bit for each endpoint. When we are setting
a bit for an endpoint we should make sure we do not touch other
endpoint bit. There is a race condition if the hardware clear the
bit between the read and the write in hw_write.

Signed-off-by: Peter Chen <peter.chen@...escale.com>
Signed-off-by: Matthieu CASTET <matthieu.castet@...rot.com>
Tested-by: Michael Grzeschik <mgrzeschik@...gutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/chipidea/udc.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -105,7 +105,7 @@ static int hw_ep_flush(struct ci_hdrc *c
 
 	do {
 		/* flush any pending transfer */
-		hw_write(ci, OP_ENDPTFLUSH, BIT(n), BIT(n));
+		hw_write(ci, OP_ENDPTFLUSH, ~0, BIT(n));
 		while (hw_read(ci, OP_ENDPTFLUSH, BIT(n)))
 			cpu_relax();
 	} while (hw_read(ci, OP_ENDPTSTAT, BIT(n)));
@@ -205,7 +205,7 @@ static int hw_ep_prime(struct ci_hdrc *c
 	if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
 		return -EAGAIN;
 
-	hw_write(ci, OP_ENDPTPRIME, BIT(n), BIT(n));
+	hw_write(ci, OP_ENDPTPRIME, ~0, BIT(n));
 
 	while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
 		cpu_relax();


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