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

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Message-ID: <CADERADOaeF3zee3OUj+qpgMGX+FCvfqSEj=7rGuY4LErPORpzg@mail.gmail.com>
Date:   Fri, 27 Jul 2018 01:08:58 +0300
From:   Georgios Tsotsos <tsotsos@...il.com>
To:     Joe Perches <joe@...ches.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        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().

Indeed i should probably either use pointer
or pass the values, i will do some more testing
and update this.
Thanks

On Thu, 26 Jul 2018 at 19:31, Joe Perches <joe@...ches.com> wrote:
>
> 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.
>


-- 
Best regards!
Georgios Tsotsos
Greece-Evia-Chalkida
tsotsos@...ux.com
skype: tsotsos
------------------------------------
Georgios Tsotsos
*Greece - Evia - Chalkida*
tsotsos[at]linux.com
skype: tsotsos