kernel panic after sema_init(&sem,-1) why?

[Sujeet Kumar]

Hi !
In our sample driver ,
The system gives panic, if I initialise the semaphore  to -1
[sema_init(&sem,-1)] and
then try to acquire it by calling down() .
It gives a kernel panic . what could be the reason for this.
Where exactly is panic() called?

could not figure out easily from code.
Thanks
sujeet




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