linux-kernel - [060/139] Input: wacom - switch mode upon system resume

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Date:	Thu, 22 Apr 2010 12:53:57 -0700
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,
	Ping Cheng <pingc@...om.com>, Dmitry Torokhov <dtor@...l.ru>
Subject: [060/139] Input: wacom - switch mode upon system resume

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

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

From: Ping Cheng <pingc@...om.com>

commit 014f61504af276ba9d9544d8a7401d8f8526eb73 upstream.

When Wacom devices wake up from a sleep, the switch mode command
(wacom_query_tablet_data) is needed before wacom_open is called.
wacom_query_tablet_data should not be executed inside wacom_open
since wacom_open is called more than once during probe.

wacom_retrieve_hid_descriptor is removed from wacom_resume due
to the fact that the required descriptors are stored properly
upon system resume.

Reported-and-tested-by: Anton Anikin <Anton@...kin.name>
Signed-off-by: Ping Cheng <pingc@...om.com>
Signed-off-by: Dmitry Torokhov <dtor@...l.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/input/tablet/wacom_sys.c |   12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

--- a/drivers/input/tablet/wacom_sys.c
+++ b/drivers/input/tablet/wacom_sys.c
@@ -644,13 +644,15 @@ static int wacom_resume(struct usb_inter
 	int rv;
 
 	mutex_lock(&wacom->lock);
-	if (wacom->open) {
+
+	/* switch to wacom mode first */
+	wacom_query_tablet_data(intf, features);
+
+	if (wacom->open)
 		rv = usb_submit_urb(wacom->irq, GFP_NOIO);
-		/* switch to wacom mode if needed */
-		if (!wacom_retrieve_hid_descriptor(intf, features))
-			wacom_query_tablet_data(intf, features);
-	} else
+	else
 		rv = 0;
+
 	mutex_unlock(&wacom->lock);
 
 	return rv;


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