| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 080/137] USB: uas: Limit qdepth at the scsi-host level | Date | Mon, 18 Apr 2016 11:29:02 +0900 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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From: Hans de Goede <hdegoede@redhat.com>
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@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- 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)
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