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authorBenjamin Tissoires <benjamin.tissoires@redhat.com>2014-12-16 17:06:02 -0500
committerPeter Wu <peter@lekensteyn.nl>2014-12-17 00:50:34 +0100
commitbd07c7c5cd189c79905e52c2f875703eeb050fa0 (patch)
treedd0c5bf12f2625272fa3972dd8b375875f96c17d
parent74b9a7964930a281b338afc80b7ec75963347606 (diff)
downloadlinux-bd07c7c5cd189c79905e52c2f875703eeb050fa0.tar.gz
HID: logitech-hidpp: store the name of the device in struct hidpplogitech-hidpp
If a disconnect occurs while getting the actual name of the device (which can take several HID transactions), the name of the device will be the hid name, provided by the Unifying Receiver. This means that in some cases, the user space will see a different name that what it usually sees when there is no disconnect. We should store the name of the device in the struct hidpp. That way, if a disconnect occurs while we are accessing the name, hidpp_connect_event() can fail, and the input node is not created. The input node will be created only if we have a connection which lasts long enough to retrieve all the requested information: name, protocol, and specific configuration. Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
-rw-r--r--drivers/hid/hid-logitech-hidpp.c31
1 files changed, 20 insertions, 11 deletions
diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index c8af3150cb31..c8bb242e06c0 100644
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -89,6 +89,7 @@ struct hidpp_device {
struct hid_device *hid_dev;
struct mutex send_mutex;
void *send_receive_buf;
+ char *name;
wait_queue_head_t wait;
bool answer_available;
u8 protocol_major;
@@ -1087,6 +1088,7 @@ static void hidpp_input_close(struct input_dev *dev)
static struct input_dev *hidpp_allocate_input(struct hid_device *hdev)
{
struct input_dev *input_dev = devm_input_allocate_device(&hdev->dev);
+ struct hidpp_device *hidpp = hid_get_drvdata(hdev);
if (!input_dev)
return NULL;
@@ -1095,7 +1097,7 @@ static struct input_dev *hidpp_allocate_input(struct hid_device *hdev)
input_dev->open = hidpp_input_open;
input_dev->close = hidpp_input_close;
- input_dev->name = hdev->name;
+ input_dev->name = hidpp->name;
input_dev->phys = hdev->phys;
input_dev->uniq = hdev->uniq;
input_dev->id.bustype = hdev->bus;
@@ -1137,22 +1139,28 @@ static void hidpp_connect_event(struct hidpp_device *hidpp)
hid_info(hdev, "HID++ %u.%u device connected.\n",
hidpp->protocol_major, hidpp->protocol_minor);
+ if (!hidpp->name || hidpp->name == hdev->name) {
+ name = hidpp_get_device_name(hidpp);
+ if (!name) {
+ hid_err(hdev,
+ "unable to retrieve the name of the device");
+ return;
+ }
+
+ devm_name = devm_kasprintf(&hdev->dev, GFP_KERNEL, "%s", name);
+ kfree(name);
+ if (!devm_name)
+ return;
+
+ hidpp->name = devm_name;
+ }
+
input = hidpp_allocate_input(hdev);
if (!input) {
hid_err(hdev, "cannot allocate new input device: %d\n", ret);
return;
}
- name = hidpp_get_device_name(hidpp);
- if (!name) {
- hid_err(hdev, "unable to retrieve the name of the device");
- } else {
- devm_name = devm_kasprintf(&hdev->dev, GFP_KERNEL, "%s", name);
- if (devm_name)
- input->name = devm_name;
- kfree(name);
- }
-
hidpp_populate_input(hidpp, input, false);
ret = input_register_device(input);
@@ -1175,6 +1183,7 @@ static int hidpp_probe(struct hid_device *hdev, const struct hid_device_id *id)
return -ENOMEM;
hidpp->hid_dev = hdev;
+ hidpp->name = hdev->name;
hid_set_drvdata(hdev, hidpp);
hidpp->quirks = id->driver_data;