linux-kernel - Re: [PATCH] xhci: reduce xhci_handshake timeout in xhci

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Date:   Mon, 14 Feb 2022 12:36:47 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Pavankumar Kondeti <quic_pkondeti@...cinc.com>
Cc:     Mathias Nyman <mathias.nyman@...el.com>,
        Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        quic_ugoswami@...cinc.com, Jung Daehwan <dh10.jung@...sung.com>
Subject: Re: [PATCH] xhci: reduce xhci_handshake timeout in xhci_reset

On Mon, Feb 14, 2022 at 04:34:23PM +0530, Pavankumar Kondeti wrote:
> From: Daehwan Jung <dh10.jung@...sung.com>
> 
> xhci_reset() is called with interrupts disabled. Waiting 10 seconds for
> controller reset and controller ready operations can be fatal to the
> system when controller is timed out. Reduce the timeout to 1 second
> and print a error message when the time out happens.
> 
> Fixes: 22ceac191211 ("xhci: Increase reset timeout for Renesas 720201 host.")
> Signed-off-by: Daehwan Jung <dh10.jung@...sung.com>
> Signed-off-by: Pavankumar Kondeti <quic_pkondeti@...cinc.com>
> ---
>  drivers/usb/host/xhci.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> index dc357ca..ec4df72 100644
> --- a/drivers/usb/host/xhci.c
> +++ b/drivers/usb/host/xhci.c
> @@ -196,7 +196,7 @@ int xhci_reset(struct xhci_hcd *xhci)
>  		udelay(1000);
>  
>  	ret = xhci_handshake(&xhci->op_regs->command,
> -			CMD_RESET, 0, 10 * 1000 * 1000);
> +			CMD_RESET, 0, 1 * 1000 * 1000);
>  	if (ret)
>  		return ret;
>  
> @@ -210,7 +210,7 @@ int xhci_reset(struct xhci_hcd *xhci)
>  	 * than status until the "Controller Not Ready" flag is cleared.
>  	 */
>  	ret = xhci_handshake(&xhci->op_regs->status,
> -			STS_CNR, 0, 10 * 1000 * 1000);
> +			STS_CNR, 0, 1 * 1000 * 1000);
>  
>  	xhci->usb2_rhub.bus_state.port_c_suspend = 0;
>  	xhci->usb2_rhub.bus_state.suspended_ports = 0;
> -- 
> 2.7.4
> 

I do not see any "print an error message" change here.  Where is that
addition?

confused,

greg k-h