Regarding spin_lock_bh

Hi,

I am trying to learn Bottom halves and I have a doubt regarding usage
of spin_lock_bh. what exactly is the need for it can't we use
spin_lock ??

For E.G. in net/bridge/br_ioctl.c we use spin_lock_bh to do operations
like get and set. Can't we use spin_lock in this case ?

Regards,
Ajith
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