linux-kernel - Re: [PATCH] xhci: fix 'broken_suspend' placement in struct xchi

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Date:   Mon, 17 Dec 2018 15:59:28 +0200
From:   Mathias Nyman <mathias.nyman@...ux.intel.com>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     oneukum@...e.com, sandeep.singh@....com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xhci: fix 'broken_suspend' placement in struct xchi_hcd

On 17.12.2018 15:37, Nicolas Saenz Julienne wrote:
> As commented in the struct's definition there shouldn't be anything
> underneath it's 'priv[0]' member as it would break some macros.
> 
> The patch converts the broken_suspend into a bit-field and relocates it
> next to to the rest of bit-fields.
> 
> Fixes: a7d57abcc8a5 ("xhci: workaround CSS timeout on AMD SNPS 3.0 xHC")
> Reported-by: Oliver Neukum  <oneukum@...e.com>
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
> ---
>   drivers/usb/host/xhci.h | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
> index c3515bad5dbb..011dd45f8718 100644
> --- a/drivers/usb/host/xhci.h
> +++ b/drivers/usb/host/xhci.h
> @@ -1863,6 +1863,8 @@ struct xhci_hcd {
>   	unsigned		sw_lpm_support:1;
>   	/* support xHCI 1.0 spec USB2 hardware LPM */
>   	unsigned		hw_lpm_support:1;
> +	/* Broken Suspend flag for SNPS Suspend resume issue */
> +	unsigned		broken_suspend:1;
>   	/* cached usb2 extened protocol capabilites */
>   	u32                     *ext_caps;
>   	unsigned int            num_ext_caps;
> @@ -1880,8 +1882,6 @@ struct xhci_hcd {
>   	void			*dbc;
>   	/* platform-specific data -- must come last */
>   	unsigned long		priv[0] __aligned(sizeof(s64));
> -	/* Broken Suspend flag for SNPS Suspend resume issue */
> -	u8			broken_suspend;
>   };
>   
>   /* Platform specific overrides to generic XHCI hc_driver ops */
> 

Thanks, not sure how I missed that.

Greg, in case you want to pick this simple fix to 4.20 still:
Acked-by: Mathias Nyman <mathias.nyman@...ux.intel.com>

Or prefer me to resend it?

-Mathias