Re: Debug: sleeping function called from invalid context at mm/slab.c:2126
From: Parag Warudkar (kernel-stuff_at_comcast.net)
Date: 11/10/05
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To: Tony <tony.uestc@gmail.com>, linux-kernel@vger.kernel.org Date: Thu, 10 Nov 2005 03:07:32 +0000
> 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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- Previous message: Andrew Morton: "Re: [PATCH 10/15] mm: atomic64 page counts"
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