IP22ZILOG: fix lockup and sysrq

 - fix lockup when switching from early console to real console
 - make sysrq reliable
 - fix panic, if sysrq is issued before console is opened

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 1 insertions, 3 deletions

diff --git a/include/asm-mips/system.h b/include/asm-mips/system.h
index 1030562d6ea6..a944eda4faf5 100644
--- a/include/asm-mips/system.h
+++ b/include/asm-mips/system.h
@@ -209,8 +209,6 @@ extern void *set_except_vector(int n, void *addr);
 extern unsigned long ebase;
 extern void per_cpu_trap_init(void);
 
-extern int stop_a_enabled;
-
 /*
  * See include/asm-ia64/system.h; prevents deadlock on SMP
  * systems.
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 6a5203fb9cf1..9963f81fea9a 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -437,7 +437,7 @@ uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
 #ifdef SUPPORT_SYSRQ
         if (port->sysrq) {
                 if (ch && time_before(jiffies, port->sysrq)) {
-                        handle_sysrq(ch, port->info->tty);
+                        handle_sysrq(ch, port->info ? port->info->tty : NULL);
                         port->sysrq = 0;
                         return 1;
                 }