kernel panic while building SDIO driver

[Udit agarwal]

Hi,
I have been trying to build the kernel (for BBB) invoking SDIO driver from
FreeBSD latest src tree using BEAGLEBONE-MMCCAM kernconf file(Yes, I added
that file manually). I seems like the kernel panics due to sleep
lock(complete logs:
https://gist.github.com/madaari/4779d75e7f1ab88369318a40cb026d9b )

mmc_dev_async(async_code=0x20, path_id=1, target_id=0, lun_id=0
Got AC_PATH_REGISTERED -- whatever...
mmc_dev_async(async_code=0x20, path_id=1, target_id=ffffffff,
lun_id=ffffffff
usbus0: 480Mbps High Speed USB v2.0
usbus1: 480Mbps High Speed USB v2.0
(noperiph:sdhci_slot0:0:-1:ffffffff): XPT_SCAN_{BUS,TGT,LUN}
Kernel page fault with the following non-sleepable locks held:
exclusive sleep mutex CAM device lock (CAM device lock) r = 0 (0xc30e1464)
lock2
stack backtrace:
Fatal kernel mode data abort: 'Translation Fault (L1)' on read
trapframe: 0xd0dc0ac0
FSR=00000005, FAR=00000010, spsr=60000013
r0 =00000061, r1 =00000188, r2 =d0dc0a8c, r3 =60000013
r4 =c30e0000, r5 =c30dec40, r6 =00000000, r7 =d0dc0b68
r8 =c086f528, r9 =c068f050, r10=00000000, r11=d0dc0d10
r12=00000062, ssp=d0dc0b50, slr=c002b77c, pc =c002b5c0
[ thread pid 4 tid 100048 ]
Stopped at mmc_action+0x94: ldr r6, [r6, #0x010]
db>

Any idea how to resolve this?

Regards,
Udit agarwal