Commit 5b91dfe1 authored by Felipe Balbi's avatar Felipe Balbi Committed by Greg Kroah-Hartman

usb: storage: scsiglue: limit USB3 devices to 2048 sectors

USB3 devices, because they are much newer, have much
less chance of having issues with larger transfers.

We still keep a limit because anything above 2048
sectors really rendered negligible speed
improvements, so we will simply ignore
that. Transferring 1MiB should already give us
pretty good performance.
Signed-off-by: default avatarFelipe Balbi <felipe.balbi@linux.intel.com>
Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 779b457f
...@@ -133,6 +133,11 @@ static int slave_configure(struct scsi_device *sdev) ...@@ -133,6 +133,11 @@ static int slave_configure(struct scsi_device *sdev)
* let the queue segment size sort out the real limit. * let the queue segment size sort out the real limit.
*/ */
blk_queue_max_hw_sectors(sdev->request_queue, 0x7FFFFF); blk_queue_max_hw_sectors(sdev->request_queue, 0x7FFFFF);
} else if (us->pusb_dev->speed >= USB_SPEED_SUPER) {
/* USB3 devices will be limited to 2048 sectors. This gives us
* better throughput on most devices.
*/
blk_queue_max_hw_sectors(sdev->request_queue, 2048);
} }
/* Some USB host controllers can't do DMA; they have to use PIO. /* Some USB host controllers can't do DMA; they have to use PIO.
......
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