Exclamation [Q] I ported CyanogenMod 11 to my phone,but the front camera doesn't work

first of all,here are my error logs:

logcat:start from turning to front camera,end after it shows "can't connect to camera"

dmesg:different part before and after i truned to front camera:

i think the kernel have problem because my front camera works well with another man's kernel,but he refused to tell me what he did with kernel

here's the kernel tree: