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SubjectRe: 5.2.x kernel: WD 8TB USB Drives: Unaligned partial completion (resid=78, sector_sz=512)
I can reproduce this with kernel 5.2.2 and a WD drive (WD40EZRZ-22GXCB0)
in a USB 3.0 enclosure featuring a JMicron SATA Bridge (ID 152d:2329)

I'm also interested in getting rid of the warnings.

* Justin Piszcz <jpiszcz@lucidpixels.com> wrote:

> 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)

--
left blank, right bald

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