linux-kernel - Re: [PATCH v3 1/1] Staging: octeon-usb: Breaks down cvmx_usb_poll

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Date:   Sun, 29 Jul 2018 17:52:10 +0300
From:   Georgios Tsotsos <tsotsos@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     devel@...verdev.osuosl.org, James Hogan <jhogan@...nel.org>,
        linux-kernel@...r.kernel.org, Aaro Koskinen <aaro.koskinen@....fi>
Subject: Re: [PATCH v3 1/1] Staging: octeon-usb: Breaks down cvmx_usb_poll_channel().

Hello,
Regarding your latest comment, i have notice many functions in this module
using kerneldoc and not been global, also there are various erroneous
situations that functions return not defined error codes.
I will try to fix them all and a new patch series for those two issues after
this one is ok. (I hope with less versions :))
On Sun, 29 Jul 2018 at 15:43, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Sun, Jul 29, 2018 at 02:41:53PM +0300, Georgios Tsotsos wrote:
> > In order to make this function more clear a new function created that controls
> > channels halt on no DMA mode.
> >
> > Signed-off-by: Georgios Tsotsos <tsotsos@...il.com>
> > ---
> >  drivers/staging/octeon-usb/octeon-hcd.c | 81 +++++++++++++++++++++------------
> >  1 file changed, 53 insertions(+), 28 deletions(-)
> >
> > diff --git a/drivers/staging/octeon-usb/octeon-hcd.c b/drivers/staging/octeon-usb/octeon-hcd.c
> > index 8a7bdf1a9fe6..3f44ac260eff 100644
> > --- a/drivers/staging/octeon-usb/octeon-hcd.c
> > +++ b/drivers/staging/octeon-usb/octeon-hcd.c
> > @@ -2593,7 +2593,51 @@ static void cvmx_usb_transfer_isoc(struct octeon_hcd *usb,
> >               cvmx_usb_complete(usb, pipe, transaction, CVMX_USB_STATUS_OK);
> >       }
> >  }
> > +/**
>
> Blank line between functions please.
>
> Also, as this is not a global function, no need for kerneldoc
> formatting, but you did it already, so no big deal.
>
> > + * Handles channels halt in non DMA mode
> > + * @hcchar_chena:
> > + * @hcint_xfercompl:
> > + * @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(u32 hcchar_chena, u32 hcint_xfercompl,
> > +                          struct octeon_hcd *usb, int channel)
> > +{
> > +     struct usb_hcd *hcd = octeon_to_hcd(usb);
> > +     struct device *dev = hcd->self.controller;
> >
> > +     if (hcchar_chena) {
> > +             union cvmx_usbcx_hcintmskx hcintmsk;
> > +             union cvmx_usbcx_hccharx usbc_hcchar;
> > +             /* Disable all interrupts except CHHLTD */
> > +             hcintmsk.u32 = 0;
> > +             hcintmsk.s.chhltdmsk = 1;
> > +             cvmx_usb_write_csr32(usb,
> > +                                  CVMX_USBCX_HCINTMSKX(channel, usb->index),
> > +                                  hcintmsk.u32);
> > +             usbc_hcchar.s.chdis = 1;
> > +             cvmx_usb_write_csr32(usb,
> > +                                  CVMX_USBCX_HCCHARX(channel, usb->index),
> > +                                  usbc_hcchar.u32);
> > +             return -1;
>
> Do not make up error values, return -EINVAL or something like that (what
> ever the real error here is.)
>
> > +     } else if (hcint_xfercompl) {
> > +             /*
> > +              * Successful IN/OUT with transfer complete.
> > +              * Channel halt isn't needed.
> > +              */
> > +     } else {
> > +             dev_err(dev, "USB%d: Channel %d interrupt without halt\n",
> > +                     usb->index, channel);
> > +             return -1;
>
> Same here.
>
> thanks,
>
> greg k-h



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