linux-kernel - [PATCH] drm/msm/disp/dpu1/dpu_encoder: Drop unnecessary NULL checks after container

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20210525112904.1747066-1-linux@roeck-us.net>
Date:   Tue, 25 May 2021 04:29:04 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Rob Clark <robdclark@...il.com>
Cc:     Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH] drm/msm/disp/dpu1/dpu_encoder: Drop unnecessary NULL checks after container_of

The result of container_of() operations is never NULL unless the embedded
element is the first element of the structure. This is not the case here.
The NULL checks on the result of container_of() are therefore unnecessary
and misleading. Remove them.

This change was made automatically with the following Coccinelle script.

@@
type t;
identifier v;
statement s;
@@

<+...
(
  t v = container_of(...);
|
  v = container_of(...);
)
  ...
  when != v
- if (\( !v \| v == NULL \) ) s
...+>

Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 8d942052db8a..a573fe211375 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -1453,11 +1453,6 @@ static void dpu_encoder_off_work(struct work_struct *work)
 	struct dpu_encoder_virt *dpu_enc = container_of(work,
 			struct dpu_encoder_virt, delayed_off_work.work);
 
-	if (!dpu_enc) {
-		DPU_ERROR("invalid dpu encoder\n");
-		return;
-	}
-
 	dpu_encoder_resource_control(&dpu_enc->base,
 						DPU_ENC_RC_EVENT_ENTER_IDLE);
 
@@ -1797,11 +1792,6 @@ static void dpu_encoder_vsync_event_work_handler(struct kthread_work *work)
 			struct dpu_encoder_virt, vsync_event_work);
 	ktime_t wakeup_time;
 
-	if (!dpu_enc) {
-		DPU_ERROR("invalid dpu encoder\n");
-		return;
-	}
-
 	if (dpu_encoder_vsync_time(&dpu_enc->base, &wakeup_time))
 		return;
 
-- 
2.25.1