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    SubjectRe: [PATCH 1/2] HID: logitech-hidpp: bail out if wtp_connect fails
    Date
    On Tuesday 16 December 2014 17:06:01 Benjamin Tissoires wrote:
    > If wtp_connect() fails, that means most of the time that the device has
    > been disconnected. Subsequent attempts to contact the device will fail
    > too, so it's simpler to bail out earlier.
    >
    > Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
    > ---
    > drivers/hid/hid-logitech-hidpp.c | 15 +++++++++------
    > 1 file changed, 9 insertions(+), 6 deletions(-)
    >
    > diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
    > index d008d71..c0fb5fe 100644
    > --- a/drivers/hid/hid-logitech-hidpp.c
    > +++ b/drivers/hid/hid-logitech-hidpp.c
    > @@ -914,24 +914,24 @@ static int wtp_allocate(struct hid_device *hdev, const struct hid_device_id *id)
    > return 0;
    > };
    >
    > -static void wtp_connect(struct hid_device *hdev, bool connected)
    > +static int wtp_connect(struct hid_device *hdev, bool connected)
    > {
    > struct hidpp_device *hidpp = hid_get_drvdata(hdev);
    > struct wtp_data *wd = hidpp->private_data;
    > int ret;
    >
    > if (!connected)
    > - return;
    > + return 0;

    "0" is success, what about -1 or -ENODEV here to signal an error? The
    following line (in hidpp_connect_event) returns on !connected, but that
    is no reason to return 0 here.

    ("No connection" sounds like an error condition to me as "[wtp_]connect"
    cannot do something meaningful.)

    Whether or not you change the return value is up to you. This patch is
    Reviewed-by: Peter Wu <peter@lekensteyn.nl>

    Kind regards,
    Peter

    > if (!wd->x_size) {
    > ret = wtp_get_config(hidpp);
    > if (ret) {
    > hid_err(hdev, "Can not get wtp config: %d\n", ret);
    > - return;
    > + return ret;
    > }
    > }
    >
    > - hidpp_touchpad_set_raw_report_state(hidpp, wd->mt_feature_index,
    > + return hidpp_touchpad_set_raw_report_state(hidpp, wd->mt_feature_index,
    > true, true);
    > }
    >
    > @@ -1115,8 +1115,11 @@ static void hidpp_connect_event(struct hidpp_device *hidpp)
    > struct input_dev *input;
    > char *name, *devm_name;
    >
    > - if (hidpp->quirks & HIDPP_QUIRK_CLASS_WTP)
    > - wtp_connect(hdev, connected);
    > + if (hidpp->quirks & HIDPP_QUIRK_CLASS_WTP) {
    > + ret = wtp_connect(hdev, connected);
    > + if (ret)
    > + return;
    > + }
    >
    > if (!connected || hidpp->delayed_input)
    > return;
    >



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