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SubjectRe: [PATCH 2/2] HID: multitouch: devm conversion
From
On Wed, Jul 24, 2013 at 6:29 PM, Benjamin Tissoires
<benjamin.tissoires@redhat.com> wrote:
> HID special drivers can use safely the devres API.
> Use it to remove 25 lines of code and to clean up a little the error paths.
>
> Besides the pur kzalloc -> devm_kzalloc conversions, I changed the

Typo 'pur' -> 'put'

> place of the allocation of the new name. Doing this right in
> mt_input_configured() removes the kstrdup call which was not very helpful
> and the new way is simpler to understand (and to debug).

Thanks for the patch! I'm sorry I didn't find time to do this by myself.
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>

>
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
> ---
> drivers/hid/hid-multitouch.c | 71 ++++++++++++++------------------------------
> 1 file changed, 23 insertions(+), 48 deletions(-)
>
> diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
> index cb0e361..0fe00e2 100644
> --- a/drivers/hid/hid-multitouch.c
> +++ b/drivers/hid/hid-multitouch.c
> @@ -261,17 +261,6 @@ static struct mt_class mt_classes[] = {
> { }
> };
>
> -static void mt_free_input_name(struct hid_input *hi)
> -{
> - struct hid_device *hdev = hi->report->device;
> - const char *name = hi->input->name;
> -
> - if (name != hdev->name) {
> - hi->input->name = hdev->name;
> - kfree(name);
> - }
> -}
> -
> static ssize_t mt_show_quirks(struct device *dev,
> struct device_attribute *attr,
> char *buf)
> @@ -415,13 +404,6 @@ static void mt_pen_report(struct hid_device *hid, struct hid_report *report)
> static void mt_pen_input_configured(struct hid_device *hdev,
> struct hid_input *hi)
> {
> - char *name = kzalloc(strlen(hi->input->name) + 5, GFP_KERNEL);
> - if (name) {
> - sprintf(name, "%s Pen", hi->input->name);
> - mt_free_input_name(hi);
> - hi->input->name = name;
> - }
> -
> /* force BTN_STYLUS to allow tablet matching in udev */
> __set_bit(BTN_STYLUS, hi->input->keybit);
> }
> @@ -928,16 +910,26 @@ static void mt_post_parse(struct mt_device *td)
> static void mt_input_configured(struct hid_device *hdev, struct hid_input *hi)
> {
> struct mt_device *td = hid_get_drvdata(hdev);
> - char *name = kstrdup(hdev->name, GFP_KERNEL);
> -
> - if (name)
> - hi->input->name = name;
> + char *name;
> + const char *suffix = NULL;
>
> if (hi->report->id == td->mt_report_id)
> mt_touch_input_configured(hdev, hi);
>
> - if (hi->report->id == td->pen_report_id)
> + if (hi->report->field[0]->physical == HID_DG_STYLUS) {
> + suffix = "Pen";
> mt_pen_input_configured(hdev, hi);
> + }
> +
> + if (suffix) {
> + name = devm_kzalloc(&hi->input->dev,
> + strlen(hdev->name) + strlen(suffix) + 2,
> + GFP_KERNEL);
> + if (name) {
> + sprintf(name, "%s %s", hdev->name, suffix);
> + hi->input->name = name;
> + }
> + }
> }
>
> static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
> @@ -945,7 +937,6 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
> int ret, i;
> struct mt_device *td;
> struct mt_class *mtclass = mt_classes; /* MT_CLS_DEFAULT */
> - struct hid_input *hi;
>
> for (i = 0; mt_classes[i].name ; i++) {
> if (id->driver_data == mt_classes[i].name) {
> @@ -967,7 +958,7 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
> hdev->quirks |= HID_QUIRK_MULTI_INPUT;
> hdev->quirks |= HID_QUIRK_NO_EMPTY_INPUT;
>
> - td = kzalloc(sizeof(struct mt_device), GFP_KERNEL);
> + td = devm_kzalloc(&hdev->dev, sizeof(struct mt_device), GFP_KERNEL);
> if (!td) {
> dev_err(&hdev->dev, "cannot allocate multitouch data\n");
> return -ENOMEM;
> @@ -980,11 +971,11 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
> td->pen_report_id = -1;
> hid_set_drvdata(hdev, td);
>
> - td->fields = kzalloc(sizeof(struct mt_fields), GFP_KERNEL);
> + td->fields = devm_kzalloc(&hdev->dev, sizeof(struct mt_fields),
> + GFP_KERNEL);
> if (!td->fields) {
> dev_err(&hdev->dev, "cannot allocate multitouch fields data\n");
> - ret = -ENOMEM;
> - goto fail;
> + return -ENOMEM;
> }
>
> if (id->vendor == HID_ANY_ID && id->product == HID_ANY_ID)
> @@ -992,29 +983,22 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
>
> ret = hid_parse(hdev);
> if (ret != 0)
> - goto fail;
> + return ret;
>
> ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
> if (ret)
> - goto hid_fail;
> + return ret;
>
> ret = sysfs_create_group(&hdev->dev.kobj, &mt_attribute_group);
>
> mt_set_maxcontacts(hdev);
> mt_set_input_mode(hdev);
>
> - kfree(td->fields);
> + /* release .fields memory as it is not used anymore */
> + devm_kfree(&hdev->dev, td->fields);
> td->fields = NULL;
>
> return 0;
> -
> -hid_fail:
> - list_for_each_entry(hi, &hdev->inputs, list)
> - mt_free_input_name(hi);
> -fail:
> - kfree(td->fields);
> - kfree(td);
> - return ret;
> }
>
> #ifdef CONFIG_PM
> @@ -1039,17 +1023,8 @@ static int mt_resume(struct hid_device *hdev)
>
> static void mt_remove(struct hid_device *hdev)
> {
> - struct mt_device *td = hid_get_drvdata(hdev);
> - struct hid_input *hi;
> -
> sysfs_remove_group(&hdev->dev.kobj, &mt_attribute_group);
> - list_for_each_entry(hi, &hdev->inputs, list)
> - mt_free_input_name(hi);
> -
> hid_hw_stop(hdev);
> -
> - kfree(td);
> - hid_set_drvdata(hdev, NULL);
> }
>
> static const struct hid_device_id mt_devices[] = {
> --
> 1.8.3.1
>



--
With Best Regards,
Andy Shevchenko


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