[PATCH] alpha: fix kernel panic during SysRq-b
Ivan Kokshaysky [Fri, 23 Sep 2005 04:43:57 +0000 (21:43 -0700)]
acquire_console_sem() does BUG() in interrupt context now, as in the case
of SysRq-b.

Cc: Richard Henderson <rth@twiddle.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/alpha/kernel/process.c

index fa98dae..eb20c3a 100644 (file)
@@ -127,6 +127,10 @@ common_shutdown_1(void *generic_ptr)
        /* If booted from SRM, reset some of the original environment. */
        if (alpha_using_srm) {
 #ifdef CONFIG_DUMMY_CONSOLE
+               /* If we've gotten here after SysRq-b, leave interrupt
+                  context before taking over the console. */
+               if (in_interrupt())
+                       irq_exit();
                /* This has the effect of resetting the VGA video origin.  */
                take_over_console(&dummy_con, 0, MAX_NR_CONSOLES-1, 1);
 #endif