linux-kernel - Re: [PATCH] of/address: check for invalid range.cpu

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Message-ID: <CAL_JsqKiyStFwPOKKVvkekzt1tUcek3_r39Rxt4OUCx+=r_t-w@mail.gmail.com>
Date:   Wed, 12 Aug 2020 10:23:34 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Colin Ian King <colin.king@...onical.com>
Cc:     Frank Rowand <frowand.list@...il.com>, devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] of/address: check for invalid range.cpu_addr

On Wed, Aug 12, 2020 at 1:32 AM Colin Ian King <colin.king@...onical.com> wrote:
>
> On 10/08/2020 15:06, Colin King wrote:
> > From: Colin Ian King <colin.king@...onical.com>
> >
> > Currently invalid CPU addresses are not being sanity checked resulting in
> > SATA setup failure on a SynQuacer SC2A11 development machine. The original
> > check was removed by and earlier commit, so add a sanity check back in
> > to avoid this regression.
> >
> > Fixes: 7a8b64d17e35 ("of/address: use range parser for of_dma_get_range")
> > Signed-off-by: Colin Ian King <colin.king@...onical.com>
> > ---
> >  drivers/of/address.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/drivers/of/address.c b/drivers/of/address.c
> > index 590493e04b01..764c8b94ec35 100644
> > --- a/drivers/of/address.c
> > +++ b/drivers/of/address.c
> > @@ -985,6 +985,11 @@ int of_dma_get_range(struct device_node *np, u64 *dma_addr, u64 *paddr, u64 *siz
> >                       /* Don't error out as we'd break some existing DTs */
> >                       continue;
> >               }
> > +             if (range.cpu_addr == OF_BAD_ADDR) {
> > +                     pr_warn("Translation of DMA address (%llx) to CPU address failed on node (%pOF)\n",

The original was pr_err, and this is an error which shouldn't happen.

> > +                             range.cpu_addr, node);

text says DMA addr, but this is the CPU addr.

> > +                     continue;
> > +             }
> >               dma_offset = range.cpu_addr - range.bus_addr;
> >
> >               /* Take lower and upper limits */
> >
>
> Hi there, any follow up on this fix? (reviews. etc?)

It's been 2 days and it's the middle of the merge window...

Also, is the DT in question upstream and fixed?

Rob