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kam_driver 08-08-2012 05:42 AM

Linux kernel 3.4.4 and 3.4.7 panic
Hi All,

I've character driver for PCIe based DMA and it is working fine till kernel version number 3.3.7 on fedora 16.

But when I updated my kernel to 3.4.4, I am getting oops message while doing memory mapping for DMA. Oops messages are coming at function dma_map_single. The message which I am getting is:

Kernel BUG at lib/iommu-helper.c:13
Invalid Opcode and then Stack Dump.....

Same thing happening on kernel 3.4.7.

Any help will be highly appreciated.

Thanks in advance.

Mara 08-10-2012 03:49 PM

This is caused by:

Is the area size you're allocating a power of two?

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