6.6-stable review patch. If anyone has any objections, please let me know.
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From: Roy Luo royluo@google.com
[ Upstream commit 399a45e5237ca14037120b1b895bd38a3b4492ea ]
device_del() can lead to new work being scheduled in gadget->work workqueue. This is observed, for example, with the dwc3 driver with the following call stack: device_del() gadget_unbind_driver() usb_gadget_disconnect_locked() dwc3_gadget_pullup() dwc3_gadget_soft_disconnect() usb_gadget_set_state() schedule_work(&gadget->work)
Move flush_work() after device_del() to ensure the workqueue is cleaned up.
Fixes: 5702f75375aa9 ("usb: gadget: udc-core: move sysfs_notify() to a workqueue") Cc: stable stable@kernel.org Signed-off-by: Roy Luo royluo@google.com Reviewed-by: Alan Stern stern@rowland.harvard.edu Reviewed-by: Thinh Nguyen Thinh.Nguyen@synopsys.com Link: https://lore.kernel.org/r/20250204233642.666991-1-royluo@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/usb/gadget/udc/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c index 1d58adc597a7e..a4120a25428e5 100644 --- a/drivers/usb/gadget/udc/core.c +++ b/drivers/usb/gadget/udc/core.c @@ -1538,8 +1538,8 @@ void usb_del_gadget(struct usb_gadget *gadget)
kobject_uevent(&udc->dev.kobj, KOBJ_REMOVE); sysfs_remove_link(&udc->dev.kobj, "gadget"); - flush_work(&gadget->work); device_del(&gadget->dev); + flush_work(&gadget->work); ida_free(&gadget_id_numbers, gadget->id_number); cancel_work_sync(&udc->vbus_work); device_unregister(&udc->dev);