linux-kernel - Re: [PATCH 2/2] RDMA: dma-mapping: Return an unsigned int from ib_dma_map_sg{,

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Date:   Mon, 29 Aug 2022 15:06:43 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Jinpu Wang <jinpu.wang@...os.com>
Cc:     jgg@...pe.ca, linux-rdma@...r.kernel.org,
        Christoph Hellwig <hch@....de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] RDMA: dma-mapping: Return an unsigned int from
 ib_dma_map_sg{,_attrs}

On Mon, Aug 29, 2022 at 11:40:40AM +0200, Jinpu Wang wrote:
> On Sun, Aug 28, 2022 at 1:09 PM Leon Romanovsky <leon@...nel.org> wrote:
> >
> > On Fri, Aug 26, 2022 at 11:56:15AM +0200, Jack Wang wrote:
> > > Following 2a047e0662ae ("dma-mapping: return an unsigned int from dma_map_sg{,_attrs}")
> > > change the return value of ib_dma_map_sg{,attrs} to unsigned int.
> > >
> > > Cc: Jason Gunthorpe <jgg@...pe.ca>
> > > Cc: Leon Romanovsky <leon@...nel.org>
> > > Cc: Christoph Hellwig <hch@....de>
> > > Cc: linux-rdma@...r.kernel.org
> > > Cc: linux-kernel@...r.kernel.org
> > >
> > > Signed-off-by: Jack Wang <jinpu.wang@...os.com>
> > > ---
> > >  drivers/infiniband/core/device.c | 2 +-
> > >  include/rdma/ib_verbs.h          | 6 +++---
> > >  2 files changed, 4 insertions(+), 4 deletions(-)
> >
> > You forgot to change ib_dma_map_sgtable_attrs() and various
> > ib_dma_map_sg*() callers.
> No, they are different.
> ib_dma_map_sgtable_attrs and dma_map_sgtable return negative on errors.

It is not the point. You changed ib_dma_virt_map_sg() to be unsigned,
so now the following lines are not correct:

  4138         int nents;
  4139
  4140         if (ib_uses_virt_dma(dev)) {
  4141                 nents = ib_dma_virt_map_sg(dev, sgt->sgl, sgt->orig_nents);

"int nents" should be changed to "unsigned int".

Thanks

> >
> > Thanks
> Thanks!