11.2 regression USB mass storage device

[Philip Homburg]

Since upgrading to 11.2-RELEASE, my laptop doesn't fully recognize my Garmin 
GPSMAP 62s anymore. In mass storage mode, the Garmin presents two block
devices, one to access the internal flash and one for the micro-SD card.

When I connect the Garmin, only the first device appears. After a camcontrol
rescan, the second appears as well.

Here is the dmesg output of connecting the Garmin:
uhub_reattach_port: giving up port reset - device vanished
ugen0.6: <vendor 0x091e product 0x2459> at usbus0
umass0 on uhub2
umass0: <vendor 0x091e product 0x2459, class 0/0, rev 2.00/5.09, addr 6> on usbus0
umass0:  SCSI over Bulk-Only; quirks = 0xc000
umass0:5:0: Attached to scbus5
da0 at umass-sim0 bus 0 scbus5 target 0 lun 0
da0: <Garmin GARMIN Flash 1.00> Removable Direct Access SPC-3 SCSI device
da0: 40.000MB/s transfers
da0: 1848MB (3784704 512 byte sectors)
da0: quirks=0x2<NO_6_BYTE>

Then I run 
# camcontrol rescan 5:0:1

And the resulting dmesg output:
da1 at umass-sim0 bus 0 scbus5 target 0 lun 1
da1: <Garmin GARMIN SD Card 1.00> Removable Direct Access SPC-3 SCSI device
da1: 40.000MB/s transfers
da1: 7646MB (15659008 512 byte sectors)
da1: quirks=0x2<NO_6_BYTE>