[PATCH] alpha: fix kernel panic during SysRq-b
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>
diff --git a/arch/alpha/kernel/process.c b/arch/alpha/kernel/process.c
index fa98dae..eb20c3a 100644
--- a/arch/alpha/kernel/process.c
+++ b/arch/alpha/kernel/process.c
@@ -127,6 +127,10 @@
/* 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