linux-kernel - RE: [PATCH -next] pga: dfl: pci: Make sure DMA related error check is not done twice

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Date:   Mon, 28 Feb 2022 09:58:21 +0000
From:   "Wu, Hao" <hao.wu@...el.com>
To:     "Xu, Yilun" <yilun.xu@...el.com>,
        Yusuf Khan <yusisamerican@...il.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-fpga@...r.kernel.org" <linux-fpga@...r.kernel.org>,
        "mdf@...nel.org" <mdf@...nel.org>,
        "trix@...hat.com" <trix@...hat.com>
Subject: RE: [PATCH -next] pga: dfl: pci: Make sure DMA related error check is
  not done twice

> On Mon, Feb 21, 2022 at 08:39:48PM -0800, Yusuf Khan wrote:
> > Note: This bug was introduced here:
> > https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-
> next.git/patch/?id=ada3caabaf6135150077c3f729bb06e8f3b5b8f6
> > I saw this commit inside the linux-next branch, it is not present in
> > the mainline branch.
> > The linux-next branch was last updated 5 days ago, so I am unsure
> > about the state of that commit.
> >
> > On Mon, Feb 21, 2022 at 8:27 PM Yusuf Khan <yusisamerican@...il.com>
> wrote:
> > >
> > > In the case that the DMA 64 bit bit mask error check does not fail,
> > > the error check will be done twice, this patch fixed that.
> > >
> > > NOTE: This patch is only for use in the linux-next branch as the
> > > commit that caused this bug happened there.

Thanks for the patch.
please remove this from the commit message, and fix the title
s/pga/fpga/

Thanks
Hao

> > >
> > > Signed-off-by: Yusuf Khan <yusisamerican@...il.com>
> > > ---
> > >  drivers/fpga/dfl-pci.c | 9 +++++----
> > >  1 file changed, 5 insertions(+), 4 deletions(-)
> > >
> > > diff --git a/drivers/fpga/dfl-pci.c b/drivers/fpga/dfl-pci.c
> > > index 717ac9715970..6222f18aed4b 100644
> > > --- a/drivers/fpga/dfl-pci.c
> > > +++ b/drivers/fpga/dfl-pci.c
> > > @@ -356,11 +356,12 @@ int cci_pci_probe(struct pci_dev *pcidev, const
> struct pci_device_id *pcidevid)
> > >         pci_set_master(pcidev);
> > >
> > >         ret = dma_set_mask_and_coherent(&pcidev->dev, DMA_BIT_MASK(64));
> > > -       if (ret)
> > > -               ret = dma_set_mask_and_coherent(&pcidev->dev,
> DMA_BIT_MASK(32));
> > >         if (ret) {
> > > -               dev_err(&pcidev->dev, "No suitable DMA support available.\n");
> > > -               goto disable_error_report_exit;
> > > +               ret = dma_set_mask_and_coherent(&pcidev->dev,
> DMA_BIT_MASK(32));
> > > +               if (ret) {
> > > +                       dev_err(&pcidev->dev, "No suitable DMA support
> available.\n");
> > > +                       goto disable_error_report_exit;
> > > +               }
> 
> Looks good to me.
> 
> Acked-by: Xu Yilun <yilun.xu@...el.com>
> 
> > >         }
> > >
> > >         ret = cci_init_drvdata(pcidev);
> > > --
> > > 2.25.1
> > >