[F-12 PATCH BZ592785] usbhid: fix oops in dev_get_drvdata

[Stanislaw Gruszka]

commit 57ab12e418ec4fe24c11788bb1bbdabb29d05679
Author: Jiri Kosina 
Date:   Wed Feb 17 14:25:01 2010 +0100

HID: usbhid: initialize interface pointers early enough

Move the initialization of USB interface pointers from _start()
    over to _probe() callback, which is where it belongs.

This fixes case where interface is NULL when parsing of report
    descriptor fails.

LKML-Reference: 
    Reported-by: Alan Stern 
    Tested-by: Bruno Prémont 
    Signed-off-by: Jiri Kosina

diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index 74bd3ca..ceaf4a1 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -1005,9 +1005,6 @@ static int usbhid_start(struct hid_device *hid)

spin_lock_init(&usbhid->lock);

-	usbhid->intf = intf;
-	usbhid->ifnum = interface->desc.bInterfaceNumber;
-
    usbhid->urbctrl = usb_alloc_urb(0, GFP_KERNEL);
    if (!usbhid->urbctrl) {
    	ret = -ENOMEM;
@@ -1178,6 +1175,8 @@ static int usbhid_probe(struct usb_interface *intf, const struct usb_device_id *

hid->driver_data = usbhid;
    usbhid->hid = hid;
+	usbhid->intf = intf;
+	usbhid->ifnum = interface->desc.bInterfaceNumber;

ret = hid_add_device(hid);
    if (ret) {

commit fde4e2f73208b8f34f123791e39c0cb6bc74b32a
Author: Alan Stern 
Date:   Fri May 7 10:41:10 2010 -0400

HID: fix suspend crash by moving initializations earlier

Although the usbhid driver allocates its usbhid structure in the probe
    routine, several critical fields in that structure don't get
    initialized until usbhid_start().  However if report descriptor
    parsing fails then usbhid_start() is never called.  This leads to
    problems during system suspend -- the system will freeze.

This patch (as1378) fixes the bug by moving the initialization
    statements up into usbhid_probe().

Signed-off-by: Alan Stern 
    Reported-by: Bruno Prémont 
    Tested-By: Bruno Prémont 
    Signed-off-by: Jiri Kosina

diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index 56d06cd..7b85b69 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -999,13 +999,6 @@ static int usbhid_start(struct hid_device *hid)
    	}
    }

-	init_waitqueue_head(&usbhid->wait);
-	INIT_WORK(&usbhid->reset_work, hid_reset);
-	INIT_WORK(&usbhid->restart_work, __usbhid_restart_queues);
-	setup_timer(&usbhid->io_retry, hid_retry_timeout, (unsigned long) hid);
-
-	spin_lock_init(&usbhid->lock);
-
    usbhid->urbctrl = usb_alloc_urb(0, GFP_KERNEL);
    if (!usbhid->urbctrl) {
    	ret = -ENOMEM;
@@ -1179,6 +1172,12 @@ static int usbhid_probe(struct usb_interface *intf, const struct usb_device_id *
    usbhid->intf = intf;
    usbhid->ifnum = interface->desc.bInterfaceNumber;

+	init_waitqueue_head(&usbhid->wait);
+	INIT_WORK(&usbhid->reset_work, hid_reset);
+	INIT_WORK(&usbhid->restart_work, __usbhid_restart_queues);
+	setup_timer(&usbhid->io_retry, hid_retry_timeout, (unsigned long) hid);
+	spin_lock_init(&usbhid->lock);
+
    ret = hid_add_device(hid);
    if (ret) {
    	if (ret != -ENODEV)