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authorHans de Goede <hdegoede@redhat.com>2016-04-12 13:27:08 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-04-13 22:02:28 +0300
commit198de51dbc3454d95b015ca0a055b673f85f01bb (patch)
tree665fd5a7f6e7698777fda58b04e471a0c0c4a011 /drivers/usb
parent2dc0194c1d0df078dc4a7bf539ce9bda7e6f1a41 (diff)
downloadlinux-198de51dbc3454d95b015ca0a055b673f85f01bb.tar.xz
USB: uas: Limit qdepth at the scsi-host level
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 Cc: stable@vger.kernel.org # 4.4.x and 4.5.x Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/storage/uas.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/usb/storage/uas.c b/drivers/usb/storage/uas.c
index 13e4cc31bc79..b1ec7499166d 100644
--- a/drivers/usb/storage/uas.c
+++ b/drivers/usb/storage/uas.c
@@ -824,7 +824,6 @@ static int uas_slave_configure(struct scsi_device *sdev)
if (devinfo->flags & US_FL_BROKEN_FUA)
sdev->broken_fua = 1;
- scsi_change_queue_depth(sdev, devinfo->qdepth - 2);
return 0;
}
@@ -956,6 +955,12 @@ static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
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)