Latest kernel couldn't probe DVD-Drive in Secondary/Slave

Hi.

  After updating kernel in -current machine, DVD-Drive in ATA
Secondary/Slave was not probed.

  If I back out sys/dev/ata/ata-lowlevel.c rev. 1.24, I could probe
it.

# atacontrol list
ATA channel 0:
    Master:  ad0 <IC35L040AVER07-0/ER4OA46A> ATA/ATAPI rev 5
    Slave:       no device present
ATA channel 1:
    Master:      no device present
    Slave:  acd0 <IDE DVD-ROM 16X/V3.10> ATA/ATAPI rev 0  <-- not probed
						          with latest kernel

  I hope to fix this problem before 5.2-RELEASE.

Cheers.
---
MIHIRA, Sanpei Yoshiro
Tokyo, Japan.


dmesg
atapci0: <Intel PIIX4 UDMA33 controller> port 0xf000-0xf00f at device 7.1 on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata0: [MPSAFE]
ata1: at 0x170 irq 15 on atapci0
ata1: [MPSAFE]
[ship]
atapci1: <Promise PDC20268 UDMA100 controller> port 0xe000-0xe00f,0xdc00-0xdc03,0xd800-0xd807,0xd400-0xd403,0xd000-0xd007 mem 0xe8108000-0xe810bfff irq 10 at device 19.0 on pci0
atapci1: [MPSAFE]
ata2: at 0xd000 on atapci1
ata2: [MPSAFE]
ata3: at 0xd800 on atapci1
ata3: [MPSAFE]