[OE-core] [PATCH] kernel.bbclass: Fix race condition

[Ed Bartosh]

Race condition between do_compile_kernelmodules and do_shared_workdir
tasks occurs when do_compile_kernelmodules changes files in
include/generated/* while do_shared_workdir tries to copy them to
shared working directory.

Functionality of do_shared_workdir has been moved to separate function
mk_shared_workdir and called from do_compile_kernelmodules.
do_shared_workdir is left in the code as it may be used in many recipes.

[YOCTO #7321]

Signed-off-by: Ed Bartosh <ed.bartosh at linux.intel.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield at windriver.com>
---
 meta/classes/kernel.bbclass | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index 125ed88..7878a73 100644
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -201,6 +201,8 @@ do_compile_kernelmodules() {
 	else
 		bbnote "no modules to compile"
 	fi
+
+	mk_shared_workdir
 }
 addtask compile_kernelmodules after do_compile before do_strip
 
@@ -245,7 +247,7 @@ emit_depmod_pkgdata() {
 
 PACKAGEFUNCS += "emit_depmod_pkgdata"
 
-do_shared_workdir () {
+mk_shared_workdir () {
 	cd ${B}
 
 	kerneldir=${STAGING_KERNEL_BUILDDIR}
@@ -289,6 +291,14 @@ do_shared_workdir () {
 	fi
 }
 
+# NOTE!!! Functionality of do_shared_workdir has been moved to mk_shared_workdir
+# and called from kernel_do_compile.
+# It caused race condition with do_compile_kernelmodules when it runs
+# in parallel with do_compile_kernelmodules
+do_shared_workdir () {
+	:
+}
+
 # We don't need to stage anything, not the modules/firmware since those would clash with linux-firmware
 sysroot_stage_all () {
 	:
-- 
2.1.4