[PATCH 2/4] kgdb: Make gdbstub_exit a nop unless gdb is attached

[Jan Kiszka]

This allows to call gdbstub_exit without worrying if
 - CONFIG_KGDB is enabled
 - if an kgdb I/O driver is loaded
 - if a gdb frontend is currently attached

Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
---
 include/linux/kgdb.h   |    1 +
 kernel/debug/gdbstub.c |    3 +++
 2 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/include/linux/kgdb.h b/include/linux/kgdb.h
index fa39183..16410e2 100644
--- a/include/linux/kgdb.h
+++ b/include/linux/kgdb.h
@@ -306,6 +306,7 @@ extern atomic_t			kgdb_active;
 extern bool dbg_is_early;
 extern void __init dbg_late_init(void);
 #else /* ! CONFIG_KGDB */
+static inline void gdbstub_exit(int status) { }
 #define in_dbg_master() (0)
 #define dbg_late_init()
 #endif /* ! CONFIG_KGDB */
diff --git a/kernel/debug/gdbstub.c b/kernel/debug/gdbstub.c
index c22d8c2..5d7ed0a 100644
--- a/kernel/debug/gdbstub.c
+++ b/kernel/debug/gdbstub.c
@@ -1111,6 +1111,9 @@ void gdbstub_exit(int status)
 	unsigned char checksum, ch, buffer[3];
 	int loop;
 
+	if (!dbg_io_ops || !kgdb_connected)
+		return;
+
 	buffer[0] = 'W';
 	buffer[1] = hex_asc_hi(status);
 	buffer[2] = hex_asc_lo(status);
-- 
1.7.3.4

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