linux-kernel - Re: [PATCH v2 3/3] Staging: octeon-usb: Breaks down cvmx_usb_poll

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Date:   Thu, 26 Jul 2018 09:31:35 -0700
From:   Joe Perches <joe@...ches.com>
To:     Georgios Tsotsos <tsotsos@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     James Hogan <jhogan@...nel.org>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] Staging: octeon-usb: Breaks down
 cvmx_usb_poll_channel().

On Thu, 2018-07-26 at 18:41 +0300, Georgios Tsotsos wrote:
> In order to make this function more clear a new function created that controls
> channels halt on no DMA mode.
[]
> diff --git a/drivers/staging/octeon-usb/octeon-hcd.c b/drivers/staging/octeon-usb/octeon-hcd.c
[]
> @@ -2585,6 +2585,52 @@ static void cvmx_usb_transfer_isoc(struct octeon_hcd *usb,
>  	}
>  }
>  
> +/**
> + * Handles channels halt in non DMA mode
> + * @usbc_hcchar: Host Channel-n Characteristics Register (HCCHAR)
> + * @usbc_hcint:  Host Channel-n Interrupt Register
> + * @usb:         USB device
> + * @channel:     Channel to poll
> + *
> + * In non DMA mode the channels don't halt themselves. We need
> + * to manually disable channels that are left running
> + *
> + * Returns: -1 on halt
> + */
> +static int cvmx_usb_dma_halt(union cvmx_usbcx_hccharx usbc_hcchar,
> +			     union cvmx_usbcx_hcintx usbc_hcint,

It looks very suspect to pass unions on the stack.

Are you sure these aren't used after this function
is called?

Likely these should be pointers to unions.