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sys_ioctl() and BKL

Greetings,
    Does anybody know why sys_ioctl() calls lock_kernel() upon entry?  I 
didn't believe it so I did a test by adding a kernel_locked() check at 
the beginning and end of the ioctl function of my driver.  Sure enough, 
the big kernel lock is held for the duration of the ioctl.  If I wanted 
to allow for the possibility of concurrent ioctl calls to my driver, 
could I simply unlock_kernel at the beginning of the ioctl handler?

Thanks,
Kevin

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