linux-kernel - [PATCH 1/2] drm/v3d: switch to drmm_mutex

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Date:   Mon,  7 Nov 2022 19:46:55 -0300
From:   Maíra Canal <mcanal@...lia.com>
To:     Melissa Wen <mwen@...lia.com>, Emma Anholt <emma@...olt.net>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     André Almeida <andrealmeid@...lia.com>,
        "Juan A . Suarez" <jasuarez@...lia.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Maíra Canal <mcanal@...lia.com>
Subject: [PATCH 1/2] drm/v3d: switch to drmm_mutex_init

mutex_init() is supposed to be balanced by a call to mutex_destroy(), but
this is not currently happening on the v3d driver.

Considering the introduction of a DRM-managed mutex_init variant, switch
to drmm_mutex_init.

Signed-off-by: Maíra Canal <mcanal@...lia.com>
---
 drivers/gpu/drm/v3d/v3d_gem.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/v3d/v3d_gem.c b/drivers/gpu/drm/v3d/v3d_gem.c
index b8980440d137..96af1cb5202a 100644
--- a/drivers/gpu/drm/v3d/v3d_gem.c
+++ b/drivers/gpu/drm/v3d/v3d_gem.c
@@ -10,6 +10,7 @@
 #include <linux/sched/signal.h>
 #include <linux/uaccess.h>
 
+#include <drm/drm_managed.h>
 #include <drm/drm_syncobj.h>
 #include <uapi/drm/v3d_drm.h>
 
@@ -1075,10 +1076,18 @@ v3d_gem_init(struct drm_device *dev)
 
 	spin_lock_init(&v3d->mm_lock);
 	spin_lock_init(&v3d->job_lock);
-	mutex_init(&v3d->bo_lock);
-	mutex_init(&v3d->reset_lock);
-	mutex_init(&v3d->sched_lock);
-	mutex_init(&v3d->cache_clean_lock);
+	ret = drmm_mutex_init(dev, &v3d->bo_lock);
+	if (ret)
+		return ret;
+	ret = drmm_mutex_init(dev, &v3d->reset_lock);
+	if (ret)
+		return ret;
+	ret = drmm_mutex_init(dev, &v3d->sched_lock);
+	if (ret)
+		return ret;
+	ret = drmm_mutex_init(dev, &v3d->cache_clean_lock);
+	if (ret)
+		return ret;
 
 	/* Note: We don't allocate address 0.  Various bits of HW
 	 * treat 0 as special, such as the occlusion query counters
-- 
2.38.1