linux-kernel - 5.2.x kernel: WD 8TB USB Drives: Unaligned partial completion (resid=78, sector

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Date:   Sat, 3 Aug 2019 05:10:44 -0400
From:   "Justin Piszcz" <jpiszcz@...idpixels.com>
To:     "'LKML'" <linux-kernel@...r.kernel.org>,
        <linux-usb@...r.kernel.org>, <linux-scsi@...r.kernel.org>
Subject: 5.2.x kernel: WD 8TB USB Drives: Unaligned partial completion (resid=78, sector_sz=512)

Attached 2 x brand new Western Digital 8TB USB 3.0 drives awhile back and
ran some file copy tests and was getting these warnings-- is there any way
to avoid these warnings?  I did confirm with parted that the partition was
aligned but this appears to be something related to the firmware on the
device according to [1] and [2]?

[1] https://patchwork.kernel.org/patch/9573203/
[2] https://patchwork.kernel.org/patch/9597797/

Part of the patch in [2] - if the firmware is buggy is there a patch or
workaround for these drives (when used in the USB enclosures) to avoid this
issue?

+	default:
+		/*
+		 * In case of bogus fw or device, we could end up having
+		 * an unaligned partial completion. Check this here and
force
+		 * alignment.
+		 */
+		resid = scsi_get_resid(SCpnt);
+		if (resid & (sector_size - 1)) {
+			sd_printk(KERN_INFO, sdkp,
+				"Unaligned partial completion (resid=%u,
sector_sz=%u)\n",
+				resid, sector_size);
+			resid = min(scsi_bufflen(SCpnt),
+				    round_up(resid, sector_size));
+			scsi_set_resid(SCpnt, resid);
+		}

Errors:

Jul 18 16:25:02 name kernel: [87305.605993] sd 8:0:0:0: [sdg] Unaligned
partial completion (resid=78, sector_sz=512)
Jul 18 16:25:02 name kernel: [87305.605993] sd 8:0:0:0: [sdg] Unaligned
partial completion (resid=78, sector_sz=512)

Jul 18 16:25:15 name kernel: [87318.292262] sd 7:0:0:0: [sdf] Unaligned
partial completion (resid=78, sector_sz=512)
Jul 18 16:25:15 name kernel: [87318.292262] sd 7:0:0:0: [sdf] Unaligned
partial completion (resid=78, sector_sz=512)