5.15-stable review patch. If anyone has any objections, please let me know.
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From: Oliver Neukum oneukum@suse.com
commit 9697f5efcf5fdea65b8390b5eb81bebe746ceedc upstream.
In case submitting the URB fails we must undo what we've done so far.
Fixes: cac6fb015f71 ("usb: class: cdc-wdm: WWAN framework integration") Cc: stable stable@kernel.org Signed-off-by: Oliver Neukum oneukum@suse.com Link: https://lore.kernel.org/r/20250401084749.175246-2-oneukum@suse.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/class/cdc-wdm.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-)
--- a/drivers/usb/class/cdc-wdm.c +++ b/drivers/usb/class/cdc-wdm.c @@ -829,6 +829,7 @@ static struct usb_class_driver wdm_class static int wdm_wwan_port_start(struct wwan_port *port) { struct wdm_device *desc = wwan_port_get_drvdata(port); + int rv;
/* The interface is both exposed via the WWAN framework and as a * legacy usbmisc chardev. If chardev is already open, just fail @@ -848,7 +849,15 @@ static int wdm_wwan_port_start(struct ww wwan_port_txon(port);
/* Start getting events */ - return usb_submit_urb(desc->validity, GFP_KERNEL); + rv = usb_submit_urb(desc->validity, GFP_KERNEL); + if (rv < 0) { + wwan_port_txoff(port); + desc->manage_power(desc->intf, 0); + /* this must be last lest we race with chardev open */ + clear_bit(WDM_WWAN_IN_USE, &desc->flags); + } + + return rv; }
static void wdm_wwan_port_stop(struct wwan_port *port)