Re: Debug: sleeping function called from invalid context at mm/slab.c:2126

[Parag Warudkar]

> I'm writing a net_device driver. I want to send a packet when the timer 
> is out. I get the following warning. It seems that I should not call 
> alloc_skb. Can anyone tell me how to get rid of this? Thanks in advance.
>

You are calling alloc_skb which in turn calls kmem_cache_alloc in interrupt context where things can't sleep and kmem_cache_alloc can sleep.  The reason for this is that you are passing GFP_KERNEL to alloc_skb. Try passing GFP_ATOMIC instead.

Other alternative is to may be use a precreated pool of skbs - may be this can be done in driver init function or any other safe context. But I don't know how much feasible that is in your situation.

HTH
Parag


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