Re: [PATCH net] net: mvneta: fix the Rx desc buffer DMA unmapping

From: David Miller
Date: Thu Sep 20 2018 - 00:25:44 EST

From: Antoine Tenart <antoine.tenart@xxxxxxxxxxx>
Date: Wed, 19 Sep 2018 15:29:06 +0200

> With CONFIG_DMA_API_DEBUG enabled we now get a warning when using the
> mvneta driver:
> mvneta d0030000.ethernet: DMA-API: device driver frees DMA memory with
> wrong function [device address=0x000000001165b000] [size=4096 bytes]
> [mapped as page] [unmapped as single]
> This is because when using the s/w buffer management, the Rx descriptor
> buffer is mapped with dma_map_page but unmapped with dma_unmap_single.
> This patch fixes this by using the right unmapping function.
> Fixes: 562e2f467e71 ("net: mvneta: Improve the buffer allocation method for SWBM")
> Signed-off-by: Antoine Tenart <antoine.tenart@xxxxxxxxxxx>