This ensures all proper DMA layer handling is taken care of by the SCSI midlayer.
Signed-off-by: Christoph Hellwig <[email protected]> --- drivers/usb/storage/uas.c | 36 ++++++++++++++++-------------------- 1 file changed, 16 insertions(+), 20 deletions(-) diff --git a/drivers/usb/storage/uas.c b/drivers/usb/storage/uas.c index 047c5922618f..d20919e7bbf4 100644 --- a/drivers/usb/storage/uas.c +++ b/drivers/usb/storage/uas.c @@ -789,29 +789,9 @@ static int uas_slave_alloc(struct scsi_device *sdev) { struct uas_dev_info *devinfo = (struct uas_dev_info *)sdev->host->hostdata; - int maxp; sdev->hostdata = devinfo; - /* - * We have two requirements here. We must satisfy the requirements - * of the physical HC and the demands of the protocol, as we - * definitely want no additional memory allocation in this path - * ruling out using bounce buffers. - * - * For a transmission on USB to continue we must never send - * a package that is smaller than maxpacket. Hence the length of each - * scatterlist element except the last must be divisible by the - * Bulk maxpacket value. - * If the HC does not ensure that through SG, - * the upper layer must do that. We must assume nothing - * about the capabilities off the HC, so we use the most - * pessimistic requirement. - */ - - maxp = usb_maxpacket(devinfo->udev, devinfo->data_in_pipe, 0); - blk_queue_virt_boundary(sdev->request_queue, maxp - 1); - /* * The protocol has no requirements on alignment in the strict sense. * Controllers may or may not have alignment restrictions. @@ -1004,6 +984,22 @@ static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id) */ shost->can_queue = devinfo->qdepth - 2; + /* + * We have two requirements here. We must satisfy the requirements of + * the physical HC and the demands of the protocol, as we definitely + * want no additional memory allocation in this path ruling out using + * bounce buffers. + * + * For a transmission on USB to continue we must never send a package + * that is smaller than maxpacket. Hence the length of each scatterlist + * element except the last must be divisible by the Bulk maxpacket + * value. If the HC does not ensure that through SG, the upper layer + * must do that. We must assume nothing about the capabilities off the + * HC, so we use the most pessimistic requirement. + */ + shost->virt_boundary_mask = + usb_maxpacket(udev, devinfo->data_in_pipe, 0) - 1; + usb_set_intfdata(intf, shost); result = scsi_add_host(shost, &intf->dev); if (result) -- 2.20.1
