linux-kernel - Re: [PATCH 1/3] dma-debug: small dma_debug_entry's comment and variable name updates

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Date:   Thu, 16 Mar 2023 11:06:15 -0300
From:   Desnes Nunes <desnesn@...hat.com>
To:     Robin Murphy <robin.murphy@....com>
Cc:     iommu@...ts.linux.dev, linux-scsi@...r.kernel.org,
        storagedev@...rochip.com, linux-kernel@...r.kernel.org, hch@....de,
        martin.petersen@...cle.com, don.brace@...rochip.com,
        m.szyprowski@...sung.com, jejb@...ux.ibm.com, jsnitsel@...hat.com
Subject: Re: [PATCH 1/3] dma-debug: small dma_debug_entry's comment and
 variable name updates

Good day Robin,

Thank you very much for the review and clarification - will send a v2
with the proper comment update.

Best Regards,

On Thu, Mar 16, 2023 at 7:24 AM Robin Murphy <robin.murphy@....com> wrote:
>
> On 2023-03-15 19:21, Desnes Nunes wrote:
> > Small update on dma_debug_entry's struct commentary and also standardize
> > the usage of 'dma_addr' variable name from debug_dma_map_page() on
> > debug_dma_unmap_page(), and similarly on debug_dma_free_coherent()
> >
> > Signed-off-by: Desnes Nunes <desnesn@...hat.com>
> > ---
> >   kernel/dma/debug.c | 11 ++++++-----
> >   1 file changed, 6 insertions(+), 5 deletions(-)
> >
> > diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c
> > index 18c93c2276ca..e0ad8db1ec25 100644
> > --- a/kernel/dma/debug.c
> > +++ b/kernel/dma/debug.c
> > @@ -52,7 +52,8 @@ enum map_err_types {
> >   /**
> >    * struct dma_debug_entry - track a dma_map* or dma_alloc_coherent mapping
> >    * @list: node on pre-allocated free_entries list
> > - * @dev: 'dev' argument to dma_map_{page|single|sg} or dma_alloc_coherent
> > + * @dev: pointer to the device driver
>
> The original comment was correct...
>
> > + * @dev_addr: 'dev' argument to dma_map_{page|single|sg} or dma_alloc_coherent
>
> ...and the address is clearly not the argument representing the device,
> since it is an address :/
>
> Thanks,
> Robin.
>
> >    * @size: length of the mapping
> >    * @type: single, page, sg, coherent
> >    * @direction: enum dma_data_direction
> > @@ -1262,13 +1263,13 @@ void debug_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
> >   }
> >   EXPORT_SYMBOL(debug_dma_mapping_error);
> >
> > -void debug_dma_unmap_page(struct device *dev, dma_addr_t addr,
> > +void debug_dma_unmap_page(struct device *dev, dma_addr_t dma_addr,
> >                         size_t size, int direction)
> >   {
> >       struct dma_debug_entry ref = {
> >               .type           = dma_debug_single,
> >               .dev            = dev,
> > -             .dev_addr       = addr,
> > +             .dev_addr       = dma_addr,
> >               .size           = size,
> >               .direction      = direction,
> >       };
> > @@ -1403,13 +1404,13 @@ void debug_dma_alloc_coherent(struct device *dev, size_t size,
> >   }
> >
> >   void debug_dma_free_coherent(struct device *dev, size_t size,
> > -                      void *virt, dma_addr_t addr)
> > +                      void *virt, dma_addr_t dma_addr)
> >   {
> >       struct dma_debug_entry ref = {
> >               .type           = dma_debug_coherent,
> >               .dev            = dev,
> >               .offset         = offset_in_page(virt),
> > -             .dev_addr       = addr,
> > +             .dev_addr       = dma_addr,
> >               .size           = size,
> >               .direction      = DMA_BIDIRECTIONAL,
> >       };
>


-- 
Desnes Nunes
Principal Software Engineer
Red Hat Brasil