From d119f637fce3136d83eaa268cf1fdd696807f179 Mon Sep 17 00:00:00 2001
From: Marius Strobl <marius@FreeBSD.org>
Date: Mon, 9 Jan 2017 17:05:39 +0000
Subject: [PATCH] In mmcsd_task(), bio_resid was not being set to 0 on a
 successful read or write, resulting in random short-read and short-write
 returns for requests. Fixing this fixes nominal block I/O via mmcsd(4).

Obtained from:	DragonFlyBSD (fd4b97583be1a1e57234713c25f6e81bc0411cb0)
MFC after:	5 days
---
 sys/dev/mmc/mmcsd.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/dev/mmc/mmcsd.c b/sys/dev/mmc/mmcsd.c
index 77491234ca8..3132c21aea0 100644
--- a/sys/dev/mmc/mmcsd.c
+++ b/sys/dev/mmc/mmcsd.c
@@ -545,6 +545,8 @@ mmcsd_task(void *arg)
 			bp->bio_error = EIO;
 			bp->bio_resid = (end - block) * sz;
 			bp->bio_flags |= BIO_ERROR;
+		} else {
+			bp->bio_resid = 0;
 		}
 		biodone(bp);
 	}