On Oct 04 2017 or thereabouts, Kees Cook wrote:
> In preparation for unconditionally passing the struct timer_list pointer to
> all timer callbacks, switch to using the new timer_setup() and from_timer()
> to pass the timer pointer explicitly. Adds pointer back to hid_device for
> multitouch.
>
> Cc: Jiri Kosina <jikos@xxxxxxxxxx>
> Cc: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
> Cc: linux-input@xxxxxxxxxxxxxxx
> Cc: linux-usb@xxxxxxxxxxxxxxx
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
> ---
> This requires commit 686fef928bba ("timer: Prepare to change timer
> callback argument type") in v4.14-rc3, but should be otherwise
> stand-alone.
Looks good to me:
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
Selfish request: Jiri can you add the dependency about 686fef928bba in
the commit message too? I am just preparing in case I need to backport
this in RHEL, and having the dep explicitly mentioned would save me a
little bit of extra time :)
(if not, no worries)
Cheers,
Benjamin
> ---
> drivers/hid/hid-multitouch.c | 10 ++++++----
> drivers/hid/usbhid/hid-core.c | 8 ++++----
> 2 files changed, 10 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
> index 440b999304a5..b0e3e2614b18 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_*) */
> @@ -1245,10 +1246,10 @@ 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,
> @@ -1279,6 +1280,7 @@ 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;
> @@ -1330,7 +1332,7 @@ 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);
> --
> 2.7.4
>
>
> --
> Kees Cook
> Pixel Security
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