Commit e2875c33 authored by Hans de Goede's avatar Hans de Goede Committed by Greg Kroah-Hartman
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uas: Limit qdepth to 32 when connected over usb-2

Some jmicron uas chipsets act up (they disconnect from the bus) when sending
more then 32 commands to them at once.

Rather then building an ever growing list with usb-id based quirks for
devices using this chipset, simply reduce the qdepth to 32 when connected
over usb-2. 32 should be plenty to keep things close to maximum
possible throughput on usb-2.

Tested-and-reported-by: default avatarLaszlo T. <>
Signed-off-by: default avatarHans de Goede <>
Signed-off-by: default avatarGreg Kroah-Hartman <>
parent 3dbef993
......@@ -1026,7 +1026,7 @@ static int uas_configure_endpoints(struct uas_dev_info *devinfo)
if (udev->speed != USB_SPEED_SUPER) {
devinfo->qdepth = 256;
devinfo->qdepth = 32;
devinfo->use_streams = 0;
} else {
devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1,
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