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usb: gadget: udc-core: Do not report -EISNAM error from gadgetfs 

When mounting a gadgetfs the following error message is seen:

$ modprobe gadgetfs
gadgetfs: USB Gadget filesystem, version 24 Aug 2004
$ mkdir  /dev/gadget
$ mount -t gadgetfs none /dev/gadget
nop ci_hdrc.0: failed to start (null): -120

The error comes from gadgetfs_probe(), which returns -EISNAM (-120).

As Alan Stern explains[1], this is the normal behavior:

"It is a temporary measure, used only when the file system is set up
initially.  The real bind routine is gadgetfs_bind(), which gets called
when userspace configures the gadget.

In short, this is how it is intended to work.  It isn't a bug."

[1] http://marc.info/?l=linux-usb&m=138029668707075&w=2

So in order to prevent the error message, do not report EISNAM as an error.

Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Fabio Estevam 2013-09-28 00:05:34 -03:00 committed by Felipe Balbi
parent 33d7be3540
commit f8cffc84a2
1 changed files with 2 additions and 1 deletions
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3
drivers/usb/gadget/udc-core.c
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@ -356,7 +356,8 @@ static int udc_bind_to_driver(struct usb_udc *udc, struct usb_gadget_driver *dri
kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
return 0;
err1:
dev_err(&udc->dev, "failed to start %s: %d\n",
if (ret != -EISNAM)
dev_err(&udc->dev, "failed to start %s: %d\n",
udc->driver->function, ret);
udc->driver = NULL;
udc->dev.driver = NULL;