ravb: unmap descriptors when freeing rings
"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. Fixes: c156633f ("Renesas Ethernet AVB driver proper") Signed-off-by: NKazuya Mizuguchi <kazuya.mizuguchi.ks@renesas.com> [simon: reworked] Signed-off-by: NSimon Horman <horms+renesas@verge.net.au> Acked-by: NSergei Shtylyov <sergei.shtylyov@cogentembedded.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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