linux-kernel - Re: [PATCH] xhci: Make debug message consistent with bus and port number

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Date:   Thu, 7 May 2020 08:45:10 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     mathias.nyman@...el.com,
        "open list:USB XHCI DRIVER" <linux-usb@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] xhci: Make debug message consistent with bus and port
 number

On Thu, May 07, 2020 at 02:17:55PM +0800, Kai-Heng Feng wrote:
> Current xhci debug message doesn't always output bus number, so it's
> hard to figure out it's from USB2 or USB3 root hub.
> 
> In addition to that, some port numbers are offset to 0 and others are
> offset to 1. Use the latter to match the USB core.
> 
> So use "bus number - port index + 1" to make debug message consistent.
> 
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> ---
>  drivers/usb/host/xhci-hub.c | 41 +++++++++++++++++++++----------------
>  1 file changed, 23 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
> index f37316d2c8fa..83088c262cc4 100644
> --- a/drivers/usb/host/xhci-hub.c
> +++ b/drivers/usb/host/xhci-hub.c
> @@ -1241,7 +1241,8 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
>  			temp = readl(ports[wIndex]->addr);
>  			/* Disable port */
>  			if (link_state == USB_SS_PORT_LS_SS_DISABLED) {
> -				xhci_dbg(xhci, "Disable port %d\n", wIndex);
> +				xhci_dbg(xhci, "Disable port %d-%d\n",
> +					 hcd->self.busnum, wIndex + 1);

Shouldn't xhci_dbg() show the bus number already?  If not, please fix
that up there instead of having to add it to all messages "by hand".

thanks,

greg k-h