On Tue, 19 Mar 2013, Noone Nowhere wrote: > > That depends on where the bug is. If it is in the stick then testing > > a different brand of flash drive would help. > > Does it need an unusual dev entry to limit max sectors? It is the > first USB stick that arrived here back in 2003(?) and uses SLC flash!! > We do not think we can find SLC USB stick any more. We will test > affected hosts with a much newer USB stick. I don't know what your old USB stick needs. If it does have an unusual_devs entry to limit max_sectors then the test program probably won't work with it. > > The test program does a bunch of error checking but practically no > > error recovery. If almost any tiny little thing goes wrong, the > > program exits. You might think that nothing else "should" go wrong -- > > but the fact is that errors do happen. > > Is the controller supposed to do such error recovery or the OS? The OS. > As far > as "should" is concerned you are completely right as A50M still breaks > with the 2 patches applied on 3.8.3 despite that we use a 16 times > larger USB stick. Breakage though occurs at the program output only: > > [ 215.244713] usb-storage 4-3:1.0: disconnect by usbfs > [ 229.774169] ehci-pci 0000:00:12.2: shutdown urb ffff88005111f9c0 > ep1in-bulk 600x > > 100 > 200 > 300 > 400 > 500 > URB timed out; bug may be present > Wrong URB completed > > , is the bug curred or no? Probably it is cured. But something is still wrong, even though it may be unrelated. > We are puzzled with this laptop, why does > the program detect the bug only on this one? Remember, the program doesn't _detect_ the bug. The kernel patch that goes along with the program does the detection. The program only tries to _trigger_ the bug. > It surely has the bug but > it breaks on its own way or breaks because of additional errata(linux > has already a USB workaround for isochronous transfers when ASPM is > used on this chip). If any sort of usbmon dump is needed, provide > instructions and we can test it at once. Instructions for usbmon are in the kernel source file Documentation/usb/usbmon.txt. > As said we have docs and we > shall read its errata. If nothing usefull is found, we can try to poke > with the controller settings. Since we mentioned ASPM, before you ask > it is disabled for all devices by ACPI FADT table. > > > That's what I would like to do. But nobody knows what > > vendor/device/revision values should be in the blacklist. > > We should not harry up and give some time for more reports. Tonight we > will test an ICH-4M and we can buy ATI IXP mainboards for testing > within this week if a table can be made. Also it is possible to buy an > ALi controller. We also have a HUMAX DVB-S2 with an external USB port > and we would love to poke with it provided that we can save all the > settings from telnet. It must be using the bcma-hcd driver and we are > looking forward to test it. Okay. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
