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Subject[PATCH 3/3] ptrace: annotate siglock acquirement
Date
lock_task_sighand() conditionally acquires sighand->siglock in case of
returning non-NULL but unlock_task_sighand() releases it unconditionally.
This leads sparse to complain about the lock context imbalance. Annotate it
to make sparse happier.

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
---
kernel/ptrace.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 1abbb4d..4553275 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -438,6 +438,7 @@ static int ptrace_getsiginfo(struct task_struct *child, siginfo_t *info)
int error = -ESRCH;

if (lock_task_sighand(child, &flags)) {
+ __acquire(&child->sighand->siglock);
error = -EINVAL;
if (likely(child->last_siginfo != NULL)) {
*info = *child->last_siginfo;
@@ -454,6 +455,7 @@ static int ptrace_setsiginfo(struct task_struct *child, const siginfo_t *info)
int error = -ESRCH;

if (lock_task_sighand(child, &flags)) {
+ __acquire(&child->sighand->siglock);
error = -EINVAL;
if (likely(child->last_siginfo != NULL)) {
*child->last_siginfo = *info;
--
1.7.0.4


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