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    SubjectRe: [bug] ata subsystem related crash with latest -git
    On Thu, Oct 18 2007, Linus Torvalds wrote:
    > On Thu, 18 Oct 2007, Jens Axboe wrote:
    > > - unsigned long addr = page_to_phys(s->page) + s->offset;
    > > + unsigned long addr = page_to_phys(sg_page(s)) + s->offset;
    > Umm. May I suggest (I haven't read the whole thread yet, maybe somebody
    > else already did) that
    > static inline unsigned long sg_phys(struct scatterlist *sg)
    > {
    > return page_to_phys(sg_page(sg)) + sg->offset;
    > }
    > would be a good thing to have?

    Sure thing, it's used quite a lot.

    > Very few drivers should care so much about the *page* itself (or the
    > offset). That's something that the generic allocation code etc cares
    > about, but the driver is almost bound to care mostly about the actual DMA
    > address, so adding that helper function that abstracts the sg access would
    > be helpful in hiding some of the cruft?

    I'll add it to the mix.

    Jens Axboe

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      Last update: 2007-10-18 19:03    [W:0.019 / U:71.724 seconds]
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