From 25fd64ed22b56b875c3f8d8bffd737a38084cf96 Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Fri, 20 Jan 2017 09:36:44 +0100 Subject: [PATCH] usb: gadget: print a meaningful error message We can only register one USB multi gadget, so check for it being already registered and print a meaningful error message if it is. Signed-off-by: Sascha Hauer --- drivers/usb/gadget/multi.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/usb/gadget/multi.c b/drivers/usb/gadget/multi.c index 13fa622f0..a2cfc8d85 100644 --- a/drivers/usb/gadget/multi.c +++ b/drivers/usb/gadget/multi.c @@ -234,6 +234,11 @@ static struct usb_composite_driver multi_driver = { int usb_multi_register(struct f_multi_opts *opts) { + if (gadget_multi_opts) { + pr_err("USB multi gadget already registered\n"); + return -EBUSY; + } + gadget_multi_opts = opts; return usb_composite_probe(&multi_driver);