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 <[email protected]> Signed-off-by: Jason Wessel <[email protected]>
amarioguy · Mar 22, 2012 · 9fbe465 · 9fbe465
1 parent 639077f
commit 9fbe465
Showing 1 changed file with 2 additions and 1 deletion.
diff --git 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();
 }