On Fri, Nov 19, 2010 at 6:22 AM, James Bottomley <James.Bottomley@xxxxxxx> wrote: > On Fri, 2010-11-19 at 01:54 +0800, 王神 wrote: >> On Thu, Nov 18, 2010 at 11:21 PM, James Bottomley >> <James.Bottomley@xxxxxxx> wrote: >> > On Thu, 2010-11-18 at 14:20 +0530, 王神 wrote: >> >> Hi >> >> >> >> I have enabled DMA for my host device and when i connect a scsi device >> >> to the host, it crashes in the following code.. >> >> >> >> Function: scsi_calculate_bounce_limit >> >> >> >> if (host_dev && host_dev->dma_mask) >> >> bounce_limit = *host_dev->dma_mask; >> >> >> >> "*dma_mask" is illegal pointer operation. I would like to understand >> >> is this known and is there reason behind such a code ? >> > >> > It likely means you're operating on a new architecture and its generic >> > devices haven't been set up correctly. >> >> Could you please more specific on what is generic devices haven't been >> setup properly... > > It means the architecture setup code left a NULL pointer in the generic > device which shouldn't be there ... without knowing which architecture > and seeing the code, it's pretty impossible to be more specific. It is for ARM and the error is not due to NULL pointer. The code just checks if it is host mode + dma enabled and it access a normal interger variable with indirection causing the crash; int dma_mask; and accessing dma_mask as "*dma_mask" ?? Anything I am missing :O > > James > > > -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
