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-rw-r--r--arch/blackfin/kernel/traps.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c
index 870d74b1b407..85766805b03a 100644
--- a/arch/blackfin/kernel/traps.c
+++ b/arch/blackfin/kernel/traps.c
@@ -138,6 +138,12 @@ static void decode_address(char *buf, unsigned long address)
if (!mm)
continue;
+ if (!down_read_trylock(&mm->mmap_sem)) {
+ if (!in_atomic)
+ mmput(mm);
+ continue;
+ }
+
for (n = rb_first(&mm->mm_rb); n; n = rb_next(n)) {
struct vm_area_struct *vma;
@@ -177,6 +183,7 @@ static void decode_address(char *buf, unsigned long address)
sprintf(buf, "[ %s vma:0x%lx-0x%lx]",
name, vma->vm_start, vma->vm_end);
+ up_read(&mm->mmap_sem);
if (!in_atomic)
mmput(mm);
@@ -186,11 +193,16 @@ static void decode_address(char *buf, unsigned long address)
goto done;
}
}
+
+ up_read(&mm->mmap_sem);
if (!in_atomic)
mmput(mm);
}
- /* we were unable to find this address anywhere */
+ /*
+ * we were unable to find this address anywhere,
+ * or some MMs were skipped because they were in use.
+ */
sprintf(buf, "/* kernel dynamic memory */");
done: