[PATCH 6.12 129/265] nfc: pn533: properly drop the usb interface reference on disconnect

Greg Kroah-Hartman
2026-03-12T20:20:06Z

From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 12133a483dfa832241fbbf09321109a0ea8a520e upstream.

When the device is disconnected from the driver, there is a "dangling"
reference count on the usb interface that was grabbed in the probe
callback. Fix this up by properly dropping the reference after we are
done with it.

Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Fixes: c46ee38620a2 ("NFC: pn533: add NXP pn533 nfc device driver")
Link: https://patch.msgid.link/2026022329-flashing-ought-7573@gregkh
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/nfc/pn533/usb.c | 1 +
1 file changed, 1 insertion(+)

--- a/drivers/nfc/pn533/usb.c
+++ b/drivers/nfc/pn533/usb.c
@@ -628,6 +628,7 @@ static void pn533_usb_disconnect(struct
usb_free_urb(phy->out_urb);
usb_free_urb(phy->ack_urb);
kfree(phy->ack_buffer);
+ usb_put_dev(phy->udev);

nfc_info(&interface->dev, "NXP PN533 NFC device disconnected\n");
}