| Message ID | 20210729004451.GA783805@pc (mailing list archive) |
|---|---|
| State | Mainlined |
| Commit | fbf42729d0e91332e8ce75a1ecce08b8a2dab9c1 |
| Delegated to: | Jiri Kosina |
| Headers | show |
| Series | [RESEND,v2] hid-elo: update the reference count of the usb device structure | expand |
On Thu, 29 Jul 2021, Salah Triki wrote: > Use usb_get_dev() to increment the reference count of the usb device > structure in order to avoid releasing the structure while it is still in > use. And use usb_put_dev() to decrement the reference count and thus, > when it will be equal to 0 the structure will be released. Applied, thanks for spotting this.
diff --git a/drivers/hid/hid-elo.c b/drivers/hid/hid-elo.c index 0d22713a3874..383dfda8c12f 100644 --- a/drivers/hid/hid-elo.c +++ b/drivers/hid/hid-elo.c @@ -228,13 +228,15 @@ static int elo_probe(struct hid_device *hdev, const struct hid_device_id *id) { struct elo_priv *priv; int ret; + struct usb_device *udev; priv = kzalloc(sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; INIT_DELAYED_WORK(&priv->work, elo_work); - priv->usbdev = interface_to_usbdev(to_usb_interface(hdev->dev.parent)); + udev = interface_to_usbdev(to_usb_interface(hdev->dev.parent)); + priv->usbdev = usb_get_dev(udev); hid_set_drvdata(hdev, priv); @@ -265,6 +267,8 @@ static void elo_remove(struct hid_device *hdev) { struct elo_priv *priv = hid_get_drvdata(hdev); + usb_put_dev(priv->usbdev); + hid_hw_stop(hdev); cancel_delayed_work_sync(&priv->work); kfree(priv);
Use usb_get_dev() to increment the reference count of the usb device structure in order to avoid releasing the structure while it is still in use. And use usb_put_dev() to decrement the reference count and thus, when it will be equal to 0 the structure will be released. Signed-off-by: Salah Triki <salah.triki@gmail.com> --- Change since v1: Modification of the description drivers/hid/hid-elo.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)