debug_core,kdb: Allow the debug core to process a recursive debug entry

This allows kdb to debug a crash with in the kms code with a
single level recursive re-entry.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
index fff59019cca0..b38bb25dbbb3 100644
--- a/kernel/debug/debug_core.c
+++ b/kernel/debug/debug_core.c
@@ -445,6 +445,10 @@ static int kgdb_reenter_check(struct kgdb_state *ks)
         }
 
         printk(KERN_CRIT "KGDB: re-enter exception: ALL breakpoints killed\n");
+#ifdef CONFIG_KGDB_KDB
+        /* Allow kdb to debug itself one level */
+        return 0;
+#endif
         dump_stack();
         panic("Recursive entry to debugger");
 
@@ -489,6 +493,9 @@ acquirelock:
          */
         atomic_inc(&cpu_in_kgdb[cpu]);
 
+        if (exception_level == 1)
+                goto cpu_master_loop;
+
         /*
          * CPU will loop if it is a slave or request to become a kgdb
          * master cpu and acquire the kgdb_active lock: