diff --git a/drivers/ata/pata_macio.c b/drivers/ata/pata_macio.c
index 817838e2f70e..3cb455a32d92 100644
--- 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 <john.g.garry@xxxxxxxxxx>
