On Sat 28-11-15 15:51:13, Pavel Machek wrote:
>
> atl1c driver is doing order-4 allocation with GFP_ATOMIC
> priority. That often breaks networking after resume. Switch to
> GFP_KERNEL. Still not ideal, but should be significantly better.
It is not clear why GFP_KERNEL can replace GFP_ATOMIC safely neither
from the changelog nor from the patch context. It is correct here
because atl1c_setup_ring_resources is a sleepable context (otherwise
tpd_ring->buffer_info = kzalloc(size, GFP_KERNEL) would be incorrect
already) but a short note wouldn't kill us, would it?
> Signed-off-by: Pavel Machek <pavel@xxxxxx>
Anyway
Reviewed-by: Michal Hocko <mhocko@xxxxxxxx>
>
> diff --git a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
> index 2795d6d..afb71e0 100644
> --- a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
> +++ b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
> @@ -1016,10 +1016,10 @@ static int atl1c_setup_ring_resources(struct atl1c_adapter *adapter)
> sizeof(struct atl1c_recv_ret_status) * rx_desc_count +
> 8 * 4;
>
> - ring_header->desc = pci_alloc_consistent(pdev, ring_header->size,
> - &ring_header->dma);
> + ring_header->desc = dma_alloc_coherent(&pdev->dev, ring_header->size,
> + &ring_header->dma, GFP_KERNEL);
> if (unlikely(!ring_header->desc)) {
> - dev_err(&pdev->dev, "pci_alloc_consistend failed\n");
> + dev_err(&pdev->dev, "could not get memmory for DMA buffer\n");
> goto err_nomem;
> }
> memset(ring_header->desc, 0, ring_header->size);
>
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
--
Michal Hocko
SUSE Labs
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