[Blackfin] arch: fix bug - grab locks when not atomic
grab locks when not atomic - this fixes the issues
sometimes seen when using magic sysrq.
Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c
index 7557d0d..de249d6 100644
--- a/arch/blackfin/kernel/traps.c
+++ b/arch/blackfin/kernel/traps.c
@@ -75,7 +75,7 @@
struct task_struct *p;
struct mm_struct *mm;
unsigned long flags, offset;
- unsigned int in_exception = bfin_read_IPEND() & 0x10;
+ unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
#ifdef CONFIG_KALLSYMS
unsigned long symsize;
@@ -117,7 +117,7 @@
*/
write_lock_irqsave(&tasklist_lock, flags);
for_each_process(p) {
- mm = (in_exception ? p->mm : get_task_mm(p));
+ mm = (in_atomic ? p->mm : get_task_mm(p));
if (!mm)
continue;
@@ -146,14 +146,14 @@
sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
(void *)address, name, offset);
- if (!in_exception)
+ if (!in_atomic)
mmput(mm);
goto done;
}
vml = vml->next;
}
- if (!in_exception)
+ if (!in_atomic)
mmput(mm);
}