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Mark Lord wrote: > I have a Dell notebook with an PCIe ExpressCard slot. > I also have a PCIe ExpressCard SATA controller (uses sata_sil24 driver). > > I would like to be able to hot plug/unplug the controller card at will. > But alas, Linux doesn't cope with it *unless* I boot the kernel with > the card initially inserted.> > 1. Booting Linux kernel (latest 2.6.23) without the card inserted > means that the card will never be detected, regardless of how many > times subsequently the card is inserted/removed/whatever. > > 2. Booting Linux kernel *with* the card inserted means that it is > detected and used, and can be unplugged/replugged as I please, > with intervening suspend/resume (RAM or disk) cycles not interfering. > > 3. Booting Linux kernel without the card inserted, and then doing > a suspend-to-disk poweroff, inserting the card, and powering on again, > the card's BIOS extension runs as normal. But on resume from the > suspend-to-disk, the running kernel again never sees the card, > even after removing/reinserting/whatever.> > 4. All of this leads me to believe that the kernel must be doing some > kind of once-only scan of hardware at boot time, and never repeating > it afterwards. Loading/unloading all of the PCI/PCIe hotplug stuff > has no effect on this, so it must be broken elsewhere. > > 5. It is not likely to be a BIOS thing, because it still fails on > power-on (with card inserted) after a suspend-to-disk, which appears > to the BIOS exactly the same as any other power-on. > > 6. But it's probably a "kernel relies on BIOS data structure read > at boot time" issue, based on the observations above. Actually, I must now take back some of that. Most of these tests were done a month or two ago. With 2.6.23.1 running, I just now redid all of the tests. Now it seems that pciehp fails to notice a newly inserted card only after a suspend/resume cycle with the slot empty. I can now get it to work again by just doing: 1. remove the card, so the slot is empty. 2. rmmod pciehp; modprobe pciehp 3. insert the card again -- it works! So we just need to fix an issue or two with suspend/resume (RAM) in pciehp. Cheers - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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