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Subject5.2.x kernel: WD 8TB USB Drives: Unaligned partial completion (resid=78, sector_sz=512)
Date
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)


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