linux-kernel - Re: [PATCH v3] usb: ohci-at91: Fix the unhandle interrupt when resume

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <8908b612-0a87-428b-9d78-38fbc04354bf@rowland.harvard.edu>
Date:   Mon, 26 Jun 2023 12:08:46 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     Guiting Shen <aarongt.shen@...il.com>
Cc:     gregkh@...uxfoundation.org, nicolas.ferre@...rochip.com,
        alexandre.belloni@...tlin.com, claudiu.beznea@...rochip.com,
        linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] usb: ohci-at91: Fix the unhandle interrupt when resume

On Mon, Jun 26, 2023 at 11:27:13PM +0800, Guiting Shen wrote:
> The ohci_hcd_at91_drv_suspend() sets ohci->rh_state to OHCI_RH_HALTED when
> suspend which will let the ohci_irq() skip the interrupt after resume. And
> nobody to handle this interrupt.
> 
> According to the comment in ohci_hcd_at91_drv_suspend(), it need to reset
> when resume from suspend(MEM) to fix by setting "hibernated" argument of
> ohci_resume().
> 
> Signed-off-by: Guiting Shen <aarongt.shen@...il.com>
> ---

Reviewed-by: Alan Stern <stern@...land.harvard.edu>

>  drivers/usb/host/ohci-at91.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
> index 533537ef3c21..360680769494 100644
> --- a/drivers/usb/host/ohci-at91.c
> +++ b/drivers/usb/host/ohci-at91.c
> @@ -673,7 +673,13 @@ ohci_hcd_at91_drv_resume(struct device *dev)
>  	else
>  		at91_start_clock(ohci_at91);
>  
> -	ohci_resume(hcd, false);
> +	/*
> +	 * According to the comment in ohci_hcd_at91_drv_suspend()
> +	 * we need to do a reset if the 48Mhz clock was stopped,
> +	 * that is, if ohci_at91->wakeup is clear. Tell ohci_resume()
> +	 * to reset in this case by setting its "hibernated" flag.
> +	 */
> +	ohci_resume(hcd, !ohci_at91->wakeup);
>  
>  	return 0;
>  }
> -- 
> 2.25.1
>