rt_mutex_lock

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 I used rt_mutex_lock to protect
one critical section in softirq-rx code . There is some kernel crash
happens in the critical section .

In my OOPs analysis i found that ..

PC- > my function code in critical section
LR -> rt_mutex_unlock .

Why LR is rt_mutex unlock ? Before unlocking , preemption can happen ?

Thanks,
Ratheesh
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