[PARISC] be more defensive in process.c::get_wchan
While debugging, I noticed we don't check the task_struct arg passed to
get_wchan, whereas everyone else does.
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c
index 0dd3847..3556648 100644
--- a/arch/parisc/kernel/process.c
+++ b/arch/parisc/kernel/process.c
@@ -381,6 +381,10 @@
struct unwind_frame_info info;
unsigned long ip;
int count = 0;
+
+ if (!p || p == current || p->state == TASK_RUNNING)
+ return 0;
+
/*
* These bracket the sleeping functions..
*/