On Wed, Jan 25, 2017 at 5:18 PM, Sergei Shtylyov
<sergei.shtylyov@xxxxxxxxxxxxxxxxxx> wrote:
> On 01/24/2017 09:21 PM, Simon Horman wrote:
>
>> From: Kazuya Mizuguchi <kazuya.mizuguchi.ks@xxxxxxxxxxx>
>>
>> "swiotlb buffer is full" errors occur after repeated initialisation of a
>> device - f.e. suspend/resume or ip link set up/down. This is because
>> memory
>> mapped using dma_map_single() in ravb_ring_format() and ravb_start_xmit()
>> is not released. Resolve this problem by unmapping descriptors when
>> freeing rings.
>
>
> Could you look into the sh_eth driver which seems to have the same issue?
Indeed, after a few suspend/resume cycles on r8a7791/koelsch:
WARNING: CPU: 1 PID: 1699 at lib/dma-debug.c:517 add_dma_entry+0xfc/0x148
DMA-API: exceeded 7 overlapping mappings of cacheline 0x0000000001a827e3
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
