A question about right-shift in ahci_port_start()

["zhao, forrest" <forrest.zhao@xxxxxxxxx>]

Hi, Jeff

When reading ahci_port_start(), I found the
following code segments:

.......
if (hpriv->cap & HOST_CAP_64)
        writel((pp->cmd_slot_dma >> 16) >> 16, port_mmio +
PORT_LST_ADDR_HI);
        writel(pp->cmd_slot_dma & 0xffffffff, port_mmio +
PORT_LST_ADDR);
        readl(port_mmio + PORT_LST_ADDR); /* flush */
......

I can't figure out why you use ">>16>>16" instead of
">>32" for right-shift 32 bits.

Would you please give me some hint?

Thanks,
Forrest
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