Re: [PATCH] OMAP:MUSB: Corrects urb unlink function path

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On Fri, 22 Aug 2008 ajay.gupta@xxxxxx wrote:

> From: Ajay Kumar Gupta <ajay.gupta@xxxxxx>
> 
> Fixes kernel panic while ISO IN transfer is aborted.Replaced usb_hcd_unlink_urb_from_ep() from musb_giveback() to __musb_giveback() to make sure urb is unlinked before giveback when __musb_giveback() is called from musb_urb_dequeue().
> 
> Signed-off-by: Ajay Kumar Gupta <ajay.gupta@xxxxxx>
> ---
>  drivers/usb/musb/musb_host.c |    3 +--
>  1 files changed, 1 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
> index 93b0678..a889ac4 100644
> --- a/drivers/usb/musb/musb_host.c
> +++ b/drivers/usb/musb/musb_host.c
> @@ -292,6 +292,7 @@ __acquires(musb->lock)
>  			);
>  
>  	spin_unlock(&musb->lock);
> +	usb_hcd_unlink_urb_from_ep(musb_to_hcd(musb), urb);
>  	usb_hcd_giveback_urb(musb_to_hcd(musb), urb, status);
>  	spin_lock(&musb->lock);

This is wrong.  You must call usb_hcd_unlink_urb_from_ep() while 
holding musb->lock.

Alan Stern

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