On Wed, Jun 12, 2019 at 08:52:21AM +0000, Yoshihiro Shimoda wrote: > Hi Christoph, > > > From: Christoph Hellwig, Sent: Wednesday, June 12, 2019 4:31 PM > > > > First things first: > > > > Yoshihiro, can you try this git branch? The new bits are just the three > > patches at the end, but they sit on top of a few patches already sent > > out to the list, so a branch is probably either: > > > > git://git.infradead.org/users/hch/misc.git scsi-virt-boundary-fixes > > Thank you for the patches! > Unfortunately, the three patches could not resolve this issue. > However, it's a hint to me, and then I found the root cause: > - slave_configure() in drivers/usb/storage/scsiglue.c calls > blk_queue_max_hw_sectors() with 2048 sectors (1 MiB) when USB_SPEED_SUPER or more. > -- So that, even if your patches (also I fixed it a little [1]) could not resolve > the issue because the max_sectors is overwritten by above code. > > So, I think we should fix the slave_configure() by using dma_max_mapping_size(). > What do you think? If so, I can make such a patch. Yes, please do.
