[PATCH v2] usb/fsl_usb2_udc: Report disconnect before unbinding

[David Brownell]

On Thursday 13 November 2008, Anton Vorontsov wrote:
> Gadgets disable endpoints in their disconnect callbacks, so
> we must call disconnect before unbinding.
> 
> The patch fixes following badness:
> 
> root at b1:~# insmod fsl_usb2_udc.ko
> Freescale High-Speed USB SOC Device Controller driver (Apr 20, 2007)
> root at b1:~# insmod g_ether.ko
> g_ether gadget: using random self ethernet address
> g_ether gadget: using random host ethernet address
> usb0: MAC 26:07:ba:c0:44:33
> usb0: HOST MAC 96:81:0c:05:4d:e3
> g_ether gadget: Ethernet Gadget, version: Memorial Day 2008
> g_ether gadget: g_ether ready
> fsl-usb2-udc: bind to driver g_ether
> g_ether gadget: high speed config #1: CDC Ethernet (ECM)
> root at b1:~# rmmod g_ether.ko
> ------------[ cut here ]------------
> Badness at drivers/usb/gadget/composite.c:871
> [...]
> NIP [e10c3454] composite_unbind+0x24/0x15c [g_ether]
> LR [e10aa454] usb_gadget_unregister_driver+0x13c/0x164 [fsl_usb2_udc]
> Call Trace:
> [df145e80] [ffffff94] 0xffffff94 (unreliable)
> [df145eb0] [e10aa454] usb_gadget_unregister_driver+0x13c/0x164 [fsl_usb2_udc]
> [df145ed0] [e10c4c40] usb_composite_unregister+0x3c/0x4c [g_ether]
> [df145ee0] [c006bcc0] sys_delete_module+0x130/0x19c
> [df145f40] [c00142d8] ret_from_syscall+0x0/0x38
> [...]
> unregistered gadget driver 'g_ether'
> 
> Signed-off-by: Anton Vorontsov <avorontsov at ru.mvista.com>

Acked-by: David Brownell <dbrownell at users.sourceforge.net>


> ---
> 
> v2:
> - Comment update per Alan Stern review.
> 
>  drivers/usb/gadget/fsl_usb2_udc.c |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/usb/gadget/fsl_usb2_udc.c b/drivers/usb/gadget/fsl_usb2_udc.c
> index 091bb55..f3c6703 100644
> --- a/drivers/usb/gadget/fsl_usb2_udc.c
> +++ b/drivers/usb/gadget/fsl_usb2_udc.c
> @@ -1836,6 +1836,9 @@ int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
>  		nuke(loop_ep, -ESHUTDOWN);
>  	spin_unlock_irqrestore(&udc_controller->lock, flags);
>  
> +	/* report disconnect; the controller is already quiesced */
> +	driver->disconnect(&udc_controller->gadget);
> +
>  	/* unbind gadget and unhook driver. */
>  	driver->unbind(&udc_controller->gadget);
>  	udc_controller->gadget.dev.driver = NULL;
> -- 
> 1.5.6.3
> --
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