This is a note to let you know that I've just added the patch titled
USB: uas: Limit qdepth at the scsi-host level
to the 4.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-uas-limit-qdepth-at-the-scsi-host-level.patch
and it can be found in the queue-4.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 198de51dbc3454d95b015ca0a055b673f85f01bb Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@xxxxxxxxxx>
Date: Tue, 12 Apr 2016 12:27:08 +0200
Subject: USB: uas: Limit qdepth at the scsi-host level
From: Hans de Goede <hdegoede@xxxxxxxxxx>
commit 198de51dbc3454d95b015ca0a055b673f85f01bb upstream.
Commit 64d513ac31bd ("scsi: use host wide tags by default") causes
the SCSI core to queue more commands then we can handle on devices with
multiple LUNs, limit the queue depth at the scsi-host level instead of
per slave to fix this.
BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1315013
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/storage/uas.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- a/drivers/usb/storage/uas.c
+++ b/drivers/usb/storage/uas.c
@@ -800,7 +800,6 @@ static int uas_slave_configure(struct sc
if (devinfo->flags & US_FL_BROKEN_FUA)
sdev->broken_fua = 1;
- scsi_change_queue_depth(sdev, devinfo->qdepth - 2);
return 0;
}
@@ -932,6 +931,12 @@ static int uas_probe(struct usb_interfac
if (result)
goto set_alt0;
+ /*
+ * 1 tag is reserved for untagged commands +
+ * 1 tag to avoid off by one errors in some bridge firmwares
+ */
+ shost->can_queue = devinfo->qdepth - 2;
+
usb_set_intfdata(intf, shost);
result = scsi_add_host(shost, &intf->dev);
if (result)
Patches currently in stable-queue which might be from hdegoede@xxxxxxxxxx are
queue-4.5/usb-uas-limit-qdepth-at-the-scsi-host-level.patch
queue-4.5/usb-uas-add-a-new-no_report_luns-quirk.patch
queue-4.5/pinctrl-sunxi-fix-a33-external-interrupts-not-working.patch
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