HID: usbhid: Convert timers to use timer_setup()

In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
(introduced by 686fef928bba ("timer: Prepare to change timer callback
argument type")) to pass the timer pointer explicitly. Adds pointer back to
hid_device for multitouch.

[jkosina@suse.cz: extend changelog a little bit as asked for by Benjamin]
Cc: Jiri Kosina <jikos@kernel.org>
Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Cc: linux-input@vger.kernel.org
Cc: linux-usb@vger.kernel.org
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

2 files changed, 10 insertions, 8 deletions

diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 9e8c4d2ba11d..8ba95c3af056 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -112,6 +112,7 @@ struct mt_device {
         struct mt_slot curdata; /* placeholder of incoming data */
         struct mt_class mtclass;        /* our mt device class */
         struct timer_list release_timer;        /* to release sticky fingers */
+        struct hid_device *hdev;        /* hid_device we're attached to */
         struct mt_fields *fields;       /* temporary placeholder for storing the
                                            multitouch fields */
         unsigned long mt_io_flags;      /* mt flags (MT_IO_FLAGS_*) */
@@ -1246,10 +1247,10 @@ static void mt_release_contacts(struct hid_device *hid)
         td->num_received = 0;
 }
 
-static void mt_expired_timeout(unsigned long arg)
+static void mt_expired_timeout(struct timer_list *t)
 {
-        struct hid_device *hdev = (void *)arg;
-        struct mt_device *td = hid_get_drvdata(hdev);
+        struct mt_device *td = from_timer(td, t, release_timer);
+        struct hid_device *hdev = td->hdev;
 
         /*
          * An input report came in just before we release the sticky fingers,
@@ -1280,6 +1281,7 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
                 dev_err(&hdev->dev, "cannot allocate multitouch data\n");
                 return -ENOMEM;
         }
+        td->hdev = hdev;
         td->mtclass = *mtclass;
         td->inputmode = -1;
         td->maxcontact_report_id = -1;
@@ -1331,7 +1333,7 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
          */
         hdev->quirks |= HID_QUIRK_NO_INIT_REPORTS;
 
-        setup_timer(&td->release_timer, mt_expired_timeout, (long)hdev);
+        timer_setup(&td->release_timer, mt_expired_timeout, 0);
 
         ret = hid_parse(hdev);
         if (ret != 0)
diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index 089bad8a9a21..9f9fe0e58f5b 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -101,10 +101,10 @@ static int hid_start_in(struct hid_device *hid)
 }
 
 /* I/O retry timer routine */
-static void hid_retry_timeout(unsigned long _hid)
+static void hid_retry_timeout(struct timer_list *t)
 {
-        struct hid_device *hid = (struct hid_device *) _hid;
-        struct usbhid_device *usbhid = hid->driver_data;
+        struct usbhid_device *usbhid = from_timer(usbhid, t, io_retry);
+        struct hid_device *hid = usbhid->hid;
 
         dev_dbg(&usbhid->intf->dev, "retrying intr urb\n");
         if (hid_start_in(hid))
@@ -1363,7 +1363,7 @@ static int usbhid_probe(struct usb_interface *intf, const struct usb_device_id *
 
         init_waitqueue_head(&usbhid->wait);
         INIT_WORK(&usbhid->reset_work, hid_reset);
-        setup_timer(&usbhid->io_retry, hid_retry_timeout, (unsigned long) hid);
+        timer_setup(&usbhid->io_retry, hid_retry_timeout, 0);
         spin_lock_init(&usbhid->lock);
 
         ret = hid_add_device(hid);