Description: ALSA: rawmidi: Fix racy buffer resize under concurrent accesses
References:
 https://bugzilla.redhat.com/show_bug.cgi?id=1900933
Notes:
Bugs:
upstream: released (5.7-rc6) [c1f6e3c818dd734c30f6a7eeebf232ba2cf3181d]
4.19-upstream-stable: released (4.19.124) [a507658fdb2ad8ca282b0eb42f2a40b805deb1e6]
4.9-upstream-stable: released (4.9.224) [c13f1463d84b86bedb664e509838bef37e6ea317]
sid: released (5.6.14-1)
4.19-buster-security: released (4.19.131-1)
4.9-stretch-security: released (4.9.228-1)