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From 86da2d12cf6f76b1fa487f7acf3995f058a2e516 Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Fri, 1 Aug 2014 17:27:49 +0200
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Subject: [PATCH v2 1/2] uas: Limit qdepth to 32 when connected over usb-2
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Some jmicron uas chipsets act up (they disconnect from the bus) when sending
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more then 32 commands to them at once.
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Rather then building an ever growing list with usb-id based quirks for
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devices using this chipset, simply reduce the qdepth to 32 when connected
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over usb-2. 32 should be plenty to keep things close to maximum
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possible throughput on usb-2.
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Cc: stable@vger.kernel.org
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Tested-and-reported-by: Laszlo T. <tlacix@gmail.com>
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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---
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drivers/usb/storage/uas.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/drivers/usb/storage/uas.c b/drivers/usb/storage/uas.c
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index 511b229..3f42785 100644
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--- a/drivers/usb/storage/uas.c
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+++ b/drivers/usb/storage/uas.c
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@@ -1026,7 +1026,7 @@ static int uas_configure_endpoints(struct uas_dev_info *devinfo)
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usb_endpoint_num(&eps[3]->desc));
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if (udev->speed != USB_SPEED_SUPER) {
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- devinfo->qdepth = 256;
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+ devinfo->qdepth = 32;
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devinfo->use_streams = 0;
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} else {
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devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1,
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--
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2.0.4
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