Bill Davidsen wrote:
Support for that ioctl could likely be added, but these days I don't
think there's much use for it. I can't see how anybody in their right
mind would want to disable DMA on a modern drive, and if libata turns
it off automatically then there's likely some serious hardware or
driver problem that will end up biting you some other way if you force
it back on.
I think deciding to turn off DMA which works fine in old kernels
qualifies as a "serious driver problem," which is why it should be under
user control.
Point is, if the DMA's not working such that the system decides to turn
it off, it's obviously having some issues, and thus turning it back on
without fixing the problem could cause problems or even cause data
corruption.
--
Robert Hancock Saskatoon, SK, Canada
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Home Page: http://www.roberthancock.com/
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