Showing error 411

User: Jiri Slaby
Error type: BUG/WARNING
Error type description: An unsatisfied assertion in the code
File location: arch/x86/kernel/pci-nommu.c
Line in file: 62
Project: Linux Kernel
Project version: 2.6.28
Tools: Web Crawler (0.1)
URL: https://bugzilla.kernel.org/show_bug.cgi?id=12320
Entered: 2011-09-08 08:49:13 UTC

Source: 

32        dma_addr_t bus = paddr;
33        WARN_ON(size == 0);
34        if (!check_addr("map_single", hwdev, bus, size))
35                                return bad_dma_address;
36        flush_write_buffers();
37        return bus;
38}
39
40
41/* Map a set of buffers described by scatterlist in streaming
42 * mode for DMA.  This is the scatter-gather version of the
43 * above pci_map_single interface.  Here the scatter gather list
44 * elements are each tagged with the appropriate dma address
45 * and length.  They are obtained via sg_dma_{address,length}(SG).
46 *
47 * NOTE: An implementation may be able to use a smaller number of
48 *       DMA address/length pairs than there are SG table elements.
49 *       (for example via virtual mapping capabilities)
50 *       The routine returns the number of addr/length pairs actually
51 *       used, at most nents.
52 *
53 * Device ownership issues as mentioned above for pci_map_single are
54 * the same here.
55 */
56static int nommu_map_sg(struct device *hwdev, struct scatterlist *sg,
57               int nents, int direction)
58{
59        struct scatterlist *s;
60        int i;
61
62        WARN_ON(nents == 0 || sg[0].length == 0);
63
64        for_each_sg(sg, s, nents, i) {
65                BUG_ON(!sg_page(s));
66                s->dma_address = sg_phys(s);
67                if (!check_addr("map_sg", hwdev, s->dma_address, s->length))
68                        return 0;
69                s->dma_length = s->length;
70        }
71        flush_write_buffers();
72        return nents;
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