linux-kernel - [PATCH v1 05/20] signal: flatten do_send_sig

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Date:   Mon, 28 May 2018 23:53:40 +0200
From:   Christian Brauner <christian@...uner.io>
To:     linux-kernel@...r.kernel.org
Cc:     ebiederm@...ssion.com, gregkh@...uxfoundation.org,
        mingo@...nel.org, james.morris@...rosoft.com,
        keescook@...omium.org, peterz@...radead.org, sds@...ho.nsa.gov,
        viro@...iv.linux.org.uk, akpm@...ux-foundation.org,
        oleg@...hat.com, Christian Brauner <christian@...uner.io>
Subject: [PATCH v1 05/20] signal: flatten do_send_sig_info()

Let's return early when lock_task_sighand() fails and move send_signal()
and unlock_task_sighand() out of the if block.

Signed-off-by: Christian Brauner <christian@...uner.io>
---
v0->v1:
* patch unchanged
---
 kernel/signal.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/signal.c b/kernel/signal.c
index baae137455eb..a628b56415e6 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1167,16 +1167,16 @@ specific_send_sig_info(int sig, struct siginfo *info, struct task_struct *t)
 }
 
 int do_send_sig_info(int sig, struct siginfo *info, struct task_struct *p,
-			bool group)
+		     bool group)
 {
 	unsigned long flags;
 	int ret = -ESRCH;
 
-	if (lock_task_sighand(p, &flags)) {
-		ret = send_signal(sig, info, p, group);
-		unlock_task_sighand(p, &flags);
-	}
+	if (!lock_task_sighand(p, &flags))
+		return ret;
 
+	ret = send_signal(sig, info, p, group);
+	unlock_task_sighand(p, &flags);
 	return ret;
 }
 
-- 
2.17.0