https://bugzilla.kernel.org/show_bug.cgi?id=80711 --- Comment #9 from Tiziano Bacocco <tiziano.bacocco@xxxxxxxxx> --- (In reply to Alan Stern from comment #8) > On Wed, 6 Aug 2014, Christoph Hellwig wrote: > > > On Wed, Aug 06, 2014 at 04:02:22PM -0400, Alan Stern wrote: > > > > I doubt either of them forces users to hack up flags for these cases. > > > > > > Why was this change needed in the first place? There's no explanation > > > in the patch itself. > > > > Which chance? The one to not support SG_FLAG_LUN_INHIBIT? > > No, the patch that started this Bugzilla entry. Tiziano says it is > needed in order to send vendor-specific commands that use the LUN bits > in CDB[1]. > > > > > At least for windows I suspect it just never sends the LUN encoded > > > > in the CDB and treats USB devices special instead of our insistance > > > > on pretending they are SCSI-2. > > > > > > We no longer pretend that USB mass-storage devices have any particular > > > SCSI level. See commit 09b6b51b0b6c. > > > > So the origina reported device must report SCSI-2 all by itself if he's > > running a recent kernel, ok. > > > > > > Maybe some of the USB people have on the wire traces or access to > > > > device or windows documentation on this? > > > > > > Most likely it varies with the version of Windows and the INQUIRY data > > > returned by the device. > > > > > > I can obtain hardware traces for the kinds of devices and computers > > > lying around here. But what sort of combinations should I test? > > > > I'd mostly be interested to see if it actualy encodes the LUN in the CDB > > for any USB multi-LUN device. > > I tried connecting a Linux mass-storage gadget with two logical units > to a host PC running Windows 7. The host scanned the first logical > unit and completely ignored the second! Didn't even send an INQUIRY > command. > > So the question remains unanswered... > > Can someone tell me if anything special is needed to make Windows > recognize logical units beyond the first? > > Alan Stern That's weird , old android phones which use multiple LUNs and Linux usb gadgets , had internal memory and SD card , and they worked on windows -- You are receiving this mail because: You are the assignee for the bug. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
