Last Error Help Kernel Compiling

any one there to fix this error compiling kernel
CC lib/rwsem.o
CC lib/sha1.o
CC lib/show_mem.o
CC lib/string.o
CC lib/timerqueue.o
CC lib/vsprintf.o
AR lib/lib.a
LINK vmlinux
LD vmlinux.o
MODPOST vmlinux.o
GEN .version
CHK include/generated/compile.h
UPD include/generated/compile.h
CC init/version.o
LD init/built-in.o
drivers/built-in.o: In function `iris_fops_open':
/home/vineet/Desktop/Kernel_Source_MI4I/drivers/media/radio/radio-iris.c:5228: undefined reference to `radio_hci_smd_init'
Makefile:820: recipe for target 'vmlinux' failed
make: *** [vmlinux] Error 1

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