Blackfin arch: Fix bug using usb keyboard crashes kernel
Without conswitchp preset, we have the following situation:
- During initcalls: con_init is called, and returns because of
!display_desc.
- At this point there is no memory allocated for vc_cons[].d
A bit later vty_init calls kbd_init.
- From now on events are passed to kbd_event which will then call
kbd_keycode.
- kbd_keycode will oops on a NULL pointer dereference on vc->vc_tty
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
[ Added commit description based on email thread. - Linus ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c
index 342bb8d..c456ee5 100644
--- a/arch/blackfin/kernel/setup.c
+++ b/arch/blackfin/kernel/setup.c
@@ -33,7 +33,6 @@
#include <linux/seq_file.h>
#include <linux/cpu.h>
#include <linux/module.h>
-#include <linux/console.h>
#include <linux/tty.h>
#include <linux/ext2_fs.h>
@@ -175,6 +174,9 @@
unsigned long mtd_phys = 0;
#endif
+#ifdef CONFIG_DUMMY_CONSOLE
+ conswitchp = &dummy_con;
+#endif
cclk = get_cclk();
sclk = get_sclk();