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a/drivers/ata/pata_macio.c > +++ b/drivers/ata/pata_macio.c > @@ -915,10 +915,13 @@ static const struct scsi_host_template pata_macio_sht = { > .sg_tablesize = MAX_DCMDS, > /* We may not need that strict one */ > .dma_boundary = ATA_DMA_BOUNDARY, > - /* Not sure what the real max is but we know it's less than 64K, let's > - * use 64K minus 256 > + /* > + * The SCSI core requires the segment size to cover at least a page, so > + * for 64K page size kernels this must be at least 64K. However the > + * hardware can't handle 64K, so pata_macio_qc_prep() will split large > + * requests. > */ > - .max_segment_size = MAX_DBDMA_SEG, > + .max_segment_size = SZ_64K, > .device_configure = pata_macio_device_configure, > .sdev_groups = ata_common_sdev_groups, > .can_queue = ATA_DEF_QUEUE, Feel free to add: Reviewed-by: John Garry