s390/pci_dma: simplify dma address calculation
Simplify the code we use to calculate dma addresses by putting everything related in a dma_alloc_address function. Also provide a dma_free_address counterpart. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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