dma_mask on scsi_calculate_bounce_limit

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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 ?

TIA
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