lantiq: Synchronize access to the DSL command pipe

Whenever two processes were executing different commands at the same
time then one of the commands sometimes got the response of the other
command.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@47213 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/target/linux/lantiq/base-files/lib/functions/lantiq_dsl.sh b/target/linux/lantiq/base-files/lib/functions/lantiq_dsl.sh
index dbeb344..22e65cb 100755 (executable)
--- a/target/linux/lantiq/base-files/lib/functions/lantiq_dsl.sh
+++ b/target/linux/lantiq/base-files/lib/functions/lantiq_dsl.sh
@@ -12,8 +12,10 @@ fi
 #
 dsl_cmd() {
        killall -0 ${XDSL_CTRL} && (
+               lock /var/lock/dsl_pipe
                echo "$@" > /tmp/pipe/dsl_cpe0_cmd
                cat /tmp/pipe/dsl_cpe0_ack
+               lock -u /var/lock/dsl_pipe
        )
 }
 dsl_val() {