From c08d46aa805ba46d501f610c2448d07bea979780 Mon Sep 17 00:00:00 2001 From: Benjamin Tissoires Date: Wed, 24 Jul 2013 19:38:05 +0200 Subject: [PATCH] HID: multitouch: devm conversion 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 basic kzalloc -> devm_kzalloc conversions, I changed the 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). Reviewed-by: Andy Shevchenko Signed-off-by: Benjamin Tissoires Signed-off-by: Jiri Kosina --- 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 cb0e361d7a4b..0fe00e2552f2 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[] = {