Hello again
On Wed, Feb 11, 2015 at 10:00 AM, Marek Szyprowski
wrote:
> Well, this int return value seems to be misleading, but according to
> Documentation/DMA-API.txt, the only error value is zero:
>
> "As with the other mapping interfaces, dma_map_sg() can fail. When it
> does, 0 is returned
Hello,
On 2015-02-11 09:37, Ricardo Ribalda Delgado wrote:
Hello Marek
On Wed, Feb 11, 2015 at 9:06 AM, Marek Szyprowski
wrote:
Unfortunately nent differs in sign to the output of dma_map_sg, so an
intermediate value must be used.
I don't get this part. dma_map_sg() returns the number of sca
Hello Marek
On Wed, Feb 11, 2015 at 9:06 AM, Marek Szyprowski
wrote:
>> Unfortunately nent differs in sign to the output of dma_map_sg, so an
>> intermediate value must be used.
>
>
> I don't get this part. dma_map_sg() returns the number of scatter list
> entries mapped
> to the hardware or zero
Hello,
On 2015-02-09 17:14, Ricardo Ribalda Delgado wrote:
when sg_alloc_table_from_pages() does not fail it returns a sg_table
structure with nents and nents_orig initialized to the same value.
dma_map_sg returns the dma_map_sg returns the number of areas mapped
by the hardware, which could be
when sg_alloc_table_from_pages() does not fail it returns a sg_table
structure with nents and nents_orig initialized to the same value.
dma_map_sg returns the dma_map_sg returns the number of areas mapped
by the hardware, which could be different than the areas given as an input.
The output must b
