linux-kernel - [60/74] usb: r8a66597-hdc disable interrupts fix

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Date:	Thu, 04 Feb 2010 09:12:31 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Magnus Damm <damm@...nsource.se>,
	Yoshihiro Shimoda <shimoda.yoshihiro@...esas.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [60/74] usb: r8a66597-hdc disable interrupts fix

2.6.32-stable review patch.  If anyone has any objections, please let us know.

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

From: Magnus Damm <damm@...nsource.se>

commit e5ff15bec96ba18698dae5de0bbf7e6a0653ca65 upstream.

This patch improves disable_controller() in the r8a66597-hdc
driver to disable all interrupts and clear status flags. It
also makes sure that disable_controller() is called during
probe(). This fixes the relatively rare case of unexpected
pending interrupts after kexec reboot.

Signed-off-by: Magnus Damm <damm@...nsource.se>
Acked-by: Yoshihiro Shimoda <shimoda.yoshihiro@...esas.com>
Signed-off-by: Paul Mundt <lethal@...ux-sh.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/usb/host/r8a66597-hcd.c |   17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

--- a/drivers/usb/host/r8a66597-hcd.c
+++ b/drivers/usb/host/r8a66597-hcd.c
@@ -216,8 +216,17 @@ static void disable_controller(struct r8
 {
 	int port;
 
+	/* disable interrupts */
 	r8a66597_write(r8a66597, 0, INTENB0);
-	r8a66597_write(r8a66597, 0, INTSTS0);
+	r8a66597_write(r8a66597, 0, INTENB1);
+	r8a66597_write(r8a66597, 0, BRDYENB);
+	r8a66597_write(r8a66597, 0, BEMPENB);
+	r8a66597_write(r8a66597, 0, NRDYENB);
+
+	/* clear status */
+	r8a66597_write(r8a66597, 0, BRDYSTS);
+	r8a66597_write(r8a66597, 0, NRDYSTS);
+	r8a66597_write(r8a66597, 0, BEMPSTS);
 
 	for (port = 0; port < r8a66597->max_root_hub; port++)
 		r8a66597_disable_port(r8a66597, port);
@@ -2470,6 +2479,12 @@ static int __devinit r8a66597_probe(stru
 	r8a66597->rh_timer.data = (unsigned long)r8a66597;
 	r8a66597->reg = (unsigned long)reg;
 
+	/* make sure no interrupts are pending */
+	ret = r8a66597_clock_enable(r8a66597);
+	if (ret < 0)
+		goto clean_up3;
+	disable_controller(r8a66597);
+
 	for (i = 0; i < R8A66597_MAX_NUM_PIPE; i++) {
 		INIT_LIST_HEAD(&r8a66597->pipe_queue[i]);
 		init_timer(&r8a66597->td_timer[i]);


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