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 4.4-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-4.4 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-4.4/usb-uas-limit-qdepth-at-the-scsi-host-level.patch queue-4.4/usb-uas-add-a-new-no_report_luns-quirk.patch queue-4.4/pinctrl-sunxi-fix-a33-external-interrupts-not-working.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html