Re: BUG: NULL pointer dereference at 00000000 -- IP: [<f8e783d5>] :b43:b43_dma_mapping_error+0x16/0x155
From: Michael Buesch
Date: Tue Jun 10 2008 - 10:24:16 EST
On Tuesday 10 June 2008 16:09:37 Miles Lane wrote:
> BUG: unable to handle kernel NULL pointer dereference at 00000000
> IP: [<f8e783d5>] :b43:b43_dma_mapping_error+0x16/0x155
It seems to crash at
60 extern const struct dma_mapping_ops *dma_ops;
61
62 static inline int dma_mapping_error(dma_addr_t dma_addr)
63 {
64 if (dma_ops->mapping_error)
65 return dma_ops->mapping_error(dma_addr);
66
67 return (dma_addr == bad_dma_address);
68 }
because dma_ops is a NULL pointer here.
Can you add a WARN_ON(!dma_ops); at the beginning of the function
inside of include/asm/x86/dma-mapping.h to confirm this?
--
Greetings Michael.
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