Re: [RFC] DMA mapping error check analysis

From: Stefan Richter
Date: Mon Sep 10 2012 - 15:28:21 EST

On Sep 10 Clemens Ladisch wrote:
> fw_iso_buffer_map_dma() maps as many pages as it can, and saves in
> ->page_count_mapped how many pages need unmapping.
> When fw_iso_buffer_map_dma() fails, ioctl_create_iso_context() does _not_
> call fw_iso_buffer_destroy() but takes care to not change the cdev's
> state in any other way. So ioctl_create_iso_context() can be called
> again and will then call fw_iso_buffer_map_dma(), which will happily
> map the pages a second time, overwriting the previous mapped addresses.

Indeed; thank you. I make a note to fix this when I get some time.
Stefan Richter
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