* [RESEND v2] hid-elo: update the reference count of the usb device structure
@ 2021-07-29 0:45 Salah Triki
2021-08-20 12:22 ` Jiri Kosina
0 siblings, 1 reply; 2+ messages in thread
From: Salah Triki @ 2021-07-29 0:45 UTC (permalink / raw)
To: Jiri Kosina, Benjamin Tissoires, gregkh; +Cc: linux-input, linux-kernel
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(-)
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);
--
2.25.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [RESEND v2] hid-elo: update the reference count of the usb device structure
2021-07-29 0:45 [RESEND v2] hid-elo: update the reference count of the usb device structure Salah Triki
@ 2021-08-20 12:22 ` Jiri Kosina
0 siblings, 0 replies; 2+ messages in thread
From: Jiri Kosina @ 2021-08-20 12:22 UTC (permalink / raw)
To: Salah Triki; +Cc: Benjamin Tissoires, gregkh, linux-input, linux-kernel
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.
--
Jiri Kosina
SUSE Labs
^ permalink raw reply [flat|nested] 2+ messages in thread
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