From 84f737b448c4a8ba04e2af953e38006bde8b343b Mon Sep 17 00:00:00 2001
From: Ned Bass <bass6@llnl.gov>
Date: Thu, 15 Jul 2010 17:53:26 -0700
Subject: [PATCH] Only try to unload modules whose use count is 0

This avoids errors from zfs.sh -u when, for example, zlib_deflate is in
use by btrfs.
---
 scripts/common.sh | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/scripts/common.sh b/scripts/common.sh
index 6f1f51d1c5..c1229b9864 100755
--- a/scripts/common.sh
+++ b/scripts/common.sh
@@ -168,8 +168,10 @@ unload_modules() {
 
 	for MOD in ${MODULES_REVERSE[*]}; do
 		local NAME=`basename ${MOD} .ko`
+		local USE_COUNT=`${LSMOD} |
+				egrep "^${NAME} "| ${AWK} '{print $3}'`
 
-		if ${LSMOD} | egrep -q "^${NAME}"; then
+		if [ "${USE_COUNT}" = 0 ] ; then
 
 			if [ "${DUMP_LOG}" -a ${NAME} = "spl" ]; then
 				spl_dump_log