From: Jan Kiszka <jan.kiszka@siemens.com>
Date: Fri, 16 Mar 2012 12:17:13 +0000 (+0100)
Subject: kgdb: Respect that flush op is optional
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=9fbe465efc76044dd87afe764db5464ae61aeabc;p=linux-beck.git

kgdb: Respect that flush op is optional

Not all kgdb I/O drivers implement a flush operation. Adjust
gdbstub_exit accordingly.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
---

diff --git a/kernel/debug/gdbstub.c b/kernel/debug/gdbstub.c
index c22d8c28ad84..5a155742ae96 100644
--- a/kernel/debug/gdbstub.c
+++ b/kernel/debug/gdbstub.c
@@ -1129,5 +1129,6 @@ void gdbstub_exit(int status)
 	dbg_io_ops->write_char(hex_asc_lo(checksum));
 
 	/* make sure the output is flushed, lest the bootloader clobber it */
-	dbg_io_ops->flush();
+	if (dbg_io_ops->flush)
+		dbg_io_ops->flush();
 }