Re: [RFC]avoid running out of endpoints with multiple S4

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On Fri, May 04, 2012 at 03:09:00PM +0200, Oliver Neukum wrote:
> Hi,
> I am experiencing the kernel on PantherPoint still running out of endpoints.
> It runs into the error case of xhci_reserve_host_control_ep_resources()
> It seems to me that for whatever reason a HC is reinitialized, the number of active
> endpoints should be reset to zero. That fixes the issue. What do you think?

A while back, you reported that endpoint contexts were not getting
removed on a resume from hibernate.  Is this bug related?  I.e. is there
code in the hibernate resume path that isn't cleaning up after the
endpoint and bandwidth tracking code?  I would rather fix the issue at
the resume than paper over it on re-init.

Sarah Sharp

> From 2ddb4ea9255e59d92515193aa21a536a4e14e50c Mon Sep 17 00:00:00 2001
> From: Oliver Neukum <oliver@xxxxxxxxxx>
> Date: Fri, 4 May 2012 14:28:18 +0200
> Subject: [PATCH] xhci: fix counting of active endpoints
> The number of active endpoints should be zeroed
> when the HCD is reinitialized, because it is not predictable
> in which state the controller had been stopped.
> Signed-off-by: Oliver Neukum <oneukum@xxxxxxx>
> ---
>  drivers/usb/host/xhci.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> index 36641a7..e7842cb 100644
> --- a/drivers/usb/host/xhci.c
> +++ b/drivers/usb/host/xhci.c
> @@ -410,6 +410,7 @@ int xhci_init(struct usb_hcd *hcd)
>  		xhci_dbg(xhci, "xHCI doesn't need link TRB QUIRK\n");
>  	}
>  	retval = xhci_mem_init(xhci, GFP_KERNEL);
> +	xhci->num_active_eps = 0;
>  	xhci_dbg(xhci, "Finished xhci_init\n");
>  	return retval;
> -- 
> 1.7.1
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