blackfin: bf561: forgot CSYNC in get_core_lock_noflush
SMP kgdb runs into dead loop without this CSYNC when one core single
steps over get_core_lock_noflush and the other executes get_core_lock
as a slave node.
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bob Liu <lliubbo@gmail.com>
diff --git a/arch/blackfin/mach-bf561/atomic.S b/arch/blackfin/mach-bf561/atomic.S
index 52d6f73..2a08df8 100644
--- a/arch/blackfin/mach-bf561/atomic.S
+++ b/arch/blackfin/mach-bf561/atomic.S
@@ -72,6 +72,13 @@
SSYNC(r2);
jump .Lretry_corelock_noflush
.Ldone_corelock_noflush:
+ /*
+ * SMP kgdb runs into dead loop without NOP here, when one core
+ * single steps over get_core_lock_noflush and the other executes
+ * get_core_lock as a slave node.
+ */
+ nop;
+ CSYNC(r2);
rts;
ENDPROC(_get_core_lock_noflush)
