From: Fugang Duan <fugang.d...@nxp.com> Date: Fri, 22 Dec 2017 17:12:09 +0800
> The enet IP only support 32 bit, it will use swiotlb buffer to do dma > mapping when xmit buffer DMA memory address is bigger than 4G in i.MX > platform. After stress suspend/resume test, it will print out: > > log: > [12826.352864] fec 5b040000.ethernet: swiotlb buffer is full (sz: 191 bytes) > [12826.359676] DMA: Out of SW-IOMMU space for 191 bytes at device > 5b040000.ethernet > [12826.367110] fec 5b040000.ethernet eth0: Tx DMA memory map failed > > The issue is that the ready xmit buffers that are dma mapped but DMA still > don't copy them into fifo, once MAC restart, these DMA buffers are not > unmapped. > So it should check the dma mapping buffer and unmap them. > > Signed-off-by: Fugang Duan <fugang.d...@nxp.com> Applied and queued up for -stable.
