kfree_skb query

[Bill Leckey]

I'm writing a driver that provides an ethernet like interface to a WAN 
link.  The device DMA's the data from me, then tells me when it's 
finished.  At that point I free the skb.  However I get the following 
warning

kernel: Warning: kfree_skb on hard IRQ d092c301

What is bad about calling kfree_skb from within a hard IRQ?  I'm afraid 
looking at the code that spat out the error message didn't help me, and 
since it's only a warning I'm assuming it's not fatal, but shouldn't be 
done for some reason.

Thanks.

Bill

-- 
Bill Leckey - Senior Software Design Engineer
TPG Research and Development
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