| Message ID | 20240904123607.3407364-12-lizetao1@huawei.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Jiri Kosina |
| Headers | show |
| Series | HID: convert to devm_hid_hw_start_and_open() | expand |
Hi On Wed, Sep 4, 2024, at 2:35 PM, Li Zetao wrote: > Currently, the wiimote module needs to maintain hid resources > by itself. Consider using devm_hid_hw_start_and_open helper to ensure > that hid resources are consistent with the device life cycle, and release > hid resources before device is released. At the same time, it can avoid > the goto-release encoding, drop the err_close and err_stop lables. > > Signed-off-by: Li Zetao <lizetao1@huawei.com> > --- > drivers/hid/hid-wiimote-core.c | 20 +++----------------- > 1 file changed, 3 insertions(+), 17 deletions(-) > > diff --git a/drivers/hid/hid-wiimote-core.c b/drivers/hid/hid-wiimote-core.c > index 26167cfb696f..28cd9ccbb617 100644 > --- a/drivers/hid/hid-wiimote-core.c > +++ b/drivers/hid/hid-wiimote-core.c > @@ -1780,8 +1780,6 @@ static void wiimote_destroy(struct wiimote_data *wdata) > wiimote_ext_unload(wdata); > wiimote_modules_unload(wdata); > cancel_work_sync(&wdata->queue.worker); > - hid_hw_close(wdata->hdev); > - hid_hw_stop(wdata->hdev); > > kfree(wdata); > } > @@ -1806,22 +1804,14 @@ static int wiimote_hid_probe(struct hid_device *hdev, > goto err; > } > > - ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW); > - if (ret) { > - hid_err(hdev, "HW start failed\n"); > + ret = devm_hid_hw_start_and_open(hdev, HID_CONNECT_HIDRAW); > + if (ret) > goto err; > - } > - > - ret = hid_hw_open(hdev); > - if (ret) { > - hid_err(hdev, "cannot start hardware I/O\n"); > - goto err_stop; > - } > > ret = device_create_file(&hdev->dev, &dev_attr_extension); > if (ret) { > hid_err(hdev, "cannot create sysfs attribute\n"); > - goto err_close; > + goto err; > } > > ret = device_create_file(&hdev->dev, &dev_attr_devtype); > @@ -1847,10 +1837,6 @@ static int wiimote_hid_probe(struct hid_device *hdev, > > err_ext: > device_remove_file(&wdata->hdev->dev, &dev_attr_extension); > -err_close: > - hid_hw_close(hdev); > -err_stop: > - hid_hw_stop(hdev); > err: > input_free_device(wdata->ir); > input_free_device(wdata->accel); > -- > 2.34.1 Looks good! Reviewed-by: David Rheinsberg <david@readahead.eu> Thanks David
On Sep 04 2024, Li Zetao wrote: > Currently, the wiimote module needs to maintain hid resources > by itself. Consider using devm_hid_hw_start_and_open helper to ensure > that hid resources are consistent with the device life cycle, and release > hid resources before device is released. At the same time, it can avoid > the goto-release encoding, drop the err_close and err_stop lables. > > Signed-off-by: Li Zetao <lizetao1@huawei.com> > --- > drivers/hid/hid-wiimote-core.c | 20 +++----------------- > 1 file changed, 3 insertions(+), 17 deletions(-) > > diff --git a/drivers/hid/hid-wiimote-core.c b/drivers/hid/hid-wiimote-core.c > index 26167cfb696f..28cd9ccbb617 100644 > --- a/drivers/hid/hid-wiimote-core.c > +++ b/drivers/hid/hid-wiimote-core.c > @@ -1780,8 +1780,6 @@ static void wiimote_destroy(struct wiimote_data *wdata) > wiimote_ext_unload(wdata); > wiimote_modules_unload(wdata); > cancel_work_sync(&wdata->queue.worker); > - hid_hw_close(wdata->hdev); > - hid_hw_stop(wdata->hdev); > > kfree(wdata); This is wrong because wdata is not devres managed. So there is probably a race condition where it gets freed while the underlying bus wasn't stopped. Cheers, Benjamin > } > @@ -1806,22 +1804,14 @@ static int wiimote_hid_probe(struct hid_device *hdev, > goto err; > } > > - ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW); > - if (ret) { > - hid_err(hdev, "HW start failed\n"); > + ret = devm_hid_hw_start_and_open(hdev, HID_CONNECT_HIDRAW); > + if (ret) > goto err; > - } > - > - ret = hid_hw_open(hdev); > - if (ret) { > - hid_err(hdev, "cannot start hardware I/O\n"); > - goto err_stop; > - } > > ret = device_create_file(&hdev->dev, &dev_attr_extension); > if (ret) { > hid_err(hdev, "cannot create sysfs attribute\n"); > - goto err_close; > + goto err; > } > > ret = device_create_file(&hdev->dev, &dev_attr_devtype); > @@ -1847,10 +1837,6 @@ static int wiimote_hid_probe(struct hid_device *hdev, > > err_ext: > device_remove_file(&wdata->hdev->dev, &dev_attr_extension); > -err_close: > - hid_hw_close(hdev); > -err_stop: > - hid_hw_stop(hdev); > err: > input_free_device(wdata->ir); > input_free_device(wdata->accel); > -- > 2.34.1 >
diff --git a/drivers/hid/hid-wiimote-core.c b/drivers/hid/hid-wiimote-core.c index 26167cfb696f..28cd9ccbb617 100644 --- a/drivers/hid/hid-wiimote-core.c +++ b/drivers/hid/hid-wiimote-core.c @@ -1780,8 +1780,6 @@ static void wiimote_destroy(struct wiimote_data *wdata) wiimote_ext_unload(wdata); wiimote_modules_unload(wdata); cancel_work_sync(&wdata->queue.worker); - hid_hw_close(wdata->hdev); - hid_hw_stop(wdata->hdev); kfree(wdata); } @@ -1806,22 +1804,14 @@ static int wiimote_hid_probe(struct hid_device *hdev, goto err; } - ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW); - if (ret) { - hid_err(hdev, "HW start failed\n"); + ret = devm_hid_hw_start_and_open(hdev, HID_CONNECT_HIDRAW); + if (ret) goto err; - } - - ret = hid_hw_open(hdev); - if (ret) { - hid_err(hdev, "cannot start hardware I/O\n"); - goto err_stop; - } ret = device_create_file(&hdev->dev, &dev_attr_extension); if (ret) { hid_err(hdev, "cannot create sysfs attribute\n"); - goto err_close; + goto err; } ret = device_create_file(&hdev->dev, &dev_attr_devtype); @@ -1847,10 +1837,6 @@ static int wiimote_hid_probe(struct hid_device *hdev, err_ext: device_remove_file(&wdata->hdev->dev, &dev_attr_extension); -err_close: - hid_hw_close(hdev); -err_stop: - hid_hw_stop(hdev); err: input_free_device(wdata->ir); input_free_device(wdata->accel);
Currently, the wiimote module needs to maintain hid resources by itself. Consider using devm_hid_hw_start_and_open helper to ensure that hid resources are consistent with the device life cycle, and release hid resources before device is released. At the same time, it can avoid the goto-release encoding, drop the err_close and err_stop lables. Signed-off-by: Li Zetao <lizetao1@huawei.com> --- drivers/hid/hid-wiimote-core.c | 20 +++----------------- 1 file changed, 3 insertions(+), 17 deletions(-)