linux-kernel - [PATCH] media/atomisp: Use lockdep instead of *mutex_is

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Date:   Wed, 14 Jul 2021 12:07:19 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Davidlohr Bueso <dave@...olabs.net>, mchehab+huawei@...nel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH] media/atomisp: Use lockdep instead of *mutex_is_locked()

On Wed, Jul 14, 2021 at 11:54:58AM +0200, Peter Zijlstra wrote:
> @@ -67,17 +71,6 @@ do { \
>  #define DEFINE_RT_MUTEX(mutexname) \
>  	struct rt_mutex mutexname = __RT_MUTEX_INITIALIZER(mutexname)
>  
> -/**
> - * rt_mutex_is_locked - is the mutex locked
> - * @lock: the mutex to be queried
> - *
> - * Returns 1 if the mutex is locked, 0 if unlocked.
> - */
> -static inline int rt_mutex_is_locked(struct rt_mutex *lock)
> -{
> -	return lock->owner != NULL;
> -}
> -

---
Subject: media/atomisp: Use lockdep instead of *mutex_is_locked()

The only user of rt_mutex_is_locked() is an anti-pattern, remove it.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
diff --git a/drivers/staging/media/atomisp/pci/atomisp_ioctl.c b/drivers/staging/media/atomisp/pci/atomisp_ioctl.c
index 6f5fe5092154..c8a625667e81 100644
--- a/drivers/staging/media/atomisp/pci/atomisp_ioctl.c
+++ b/drivers/staging/media/atomisp/pci/atomisp_ioctl.c
@@ -1904,8 +1904,8 @@ int __atomisp_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
 	dev_dbg(isp->dev, "Stop stream on pad %d for asd%d\n",
 		atomisp_subdev_source_pad(vdev), asd->index);
 
-	BUG_ON(!rt_mutex_is_locked(&isp->mutex));
-	BUG_ON(!mutex_is_locked(&isp->streamoff_mutex));
+	lockdep_assert_held(&isp->mutex);
+	lockdep_assert_held(&isp->streamoff_mutex);
 
 	if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 		dev_dbg(isp->dev, "unsupported v4l2 buf type\n");