linux-kernel - [PATCH 3.14 062/125] usb: musb: host: rely on port_mode to call musb

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Message-Id: <20150731194029.306990249@linuxfoundation.org>
Date:	Fri, 31 Jul 2015 12:41:02 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Sekhar Nori <nsekhar@...com>, Felipe Balbi <balbi@...com>
Subject: [PATCH 3.14 062/125] usb: musb: host: rely on port_mode to call musb_start()

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

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

From: Felipe Balbi <balbi@...com>

commit be9d39881fc4fa39a64b6eed6bab5d9ee5125344 upstream.

Currently, we're calling musb_start() twice for DRD ports
in some situations. This has been observed to cause enumeration
issues after suspend/resume cycles with AM335x.

In order to fix the problem, we just have to fix the check
on musb_has_gadget() so that it only returns true if
current mode is Host and ignore the fact that we have or
not a gadget driver loaded.

Fixes: ae44df2e21b5 (usb: musb: call musb_start() only once in OTG mode)
Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Tested-by: Sekhar Nori <nsekhar@...com>
Signed-off-by: Felipe Balbi <balbi@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/musb/musb_virthub.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/drivers/usb/musb/musb_virthub.c
+++ b/drivers/usb/musb/musb_virthub.c
@@ -273,9 +273,7 @@ static int musb_has_gadget(struct musb *
 #ifdef CONFIG_USB_MUSB_HOST
 	return 1;
 #else
-	if (musb->port_mode == MUSB_PORT_MODE_HOST)
-		return 1;
-	return musb->g.dev.driver != NULL;
+	return musb->port_mode == MUSB_PORT_MODE_HOST;
 #endif
 }
 


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