linux-kernel - [PATCH v2] tablet: acecad: update the reference count of the usb interface structure

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Date:   Sat, 31 Jul 2021 17:09:38 +0100
From:   Salah Triki <salah.triki@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Fabio Aiuto <fabioaiuto83@...il.com>,
        Ross Schmidt <ross.schm.dev@...il.com>,
        Marco Cesati <marcocesati@...il.com>,
        Brother Matthew De Angelis <matthew.v.deangelis@...il.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Ivan Safonov <insafonov@...il.com>,
        Dan Carpenter <dan.carpenter@...cle.com>
Cc:     linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: [PATCH v2] tablet: acecad: update the reference count of the usb
 interface structure

Based on the following documentation usb_get_inf(), use usb_get_intf()
and usb_put_intf() in order to update the reference count of the usb
interface structure.

Documentation of usb_get_inf():

[quote]
Each live reference to a interface must be refcounted.

Drivers for USB interfaces should normally record such references
in their probe methods, when they bind to an interface, and release them
by calling usb_put_intf, in their disconnect methods.
[/quote]

Signed-off-by: Salah Triki <salah.triki@...il.com>
---
Change since v1:
	Modification of the description

 drivers/input/tablet/acecad.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/input/tablet/acecad.c b/drivers/input/tablet/acecad.c
index a38d1fe97334..85fe134a30ee 100644
--- a/drivers/input/tablet/acecad.c
+++ b/drivers/input/tablet/acecad.c
@@ -151,7 +151,7 @@ static int usb_acecad_probe(struct usb_interface *intf, const struct usb_device_
 		goto fail2;
 	}
 
-	acecad->intf = intf;
+	acecad->intf = usb_get_intf(intf);
 	acecad->input = input_dev;
 
 	if (dev->manufacturer)
@@ -236,6 +236,9 @@ static void usb_acecad_disconnect(struct usb_interface *intf)
 	input_unregister_device(acecad->input);
 	usb_free_urb(acecad->irq);
 	usb_free_coherent(udev, 8, acecad->data, acecad->data_dma);
+
+	usb_put_intf(acecad->intf);
+
 	kfree(acecad);
 }
 
-- 
2.25.1