On Fri, 30 Jul 2010, Eric W. Biederman wrote: > David Woodhouse <dwmw2 at infradead.org> writes: >> The DMA gets blocked, and you don't have to worry about whether the device was >> shut down cleanly or not. The device may be unhappy, but when the new kernel's >> driver loads and reinitialises it, all should be forgiven. > > Assuming IOMMU page faults don't cause pain. I seem to remember that > also being a nasty issue. Only if the driver (or the hardware) is so broken that it can't reccover. There's very little excuse for a driver to have that problem even at runtime (and fail to recover from such an error)... for a driver to fail to initialise the hardware even when that driver is first being loaded is *entirely* fucked. Not that it doesn't happen, of course. But do we care? I lump those broken drivers is the same class as the ones which only work after a warm start from Windows or Mac OS. -- dwmw2
