linux-kernel - [PATCH] drm/vkms: Suppress context imbalance sparse warning

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Message-Id: <20240912-vkms-warnings-v1-1-59f3e13ea8e5@bootlin.com>
Date: Thu, 12 Sep 2024 17:25:33 +0200
From: Louis Chauvet <louis.chauvet@...tlin.com>
To: Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>, 
 Maíra Canal <mairacanal@...eup.net>, 
 Haneen Mohammed <hamohammed.sa@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Melissa Wen <melissa.srw@...il.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>
Cc: thomas.petazzoni@...tlin.com, dri-devel@...ts.freedesktop.org, 
 linux-kernel@...r.kernel.org, Louis Chauvet <louis.chauvet@...tlin.com>
Subject: [PATCH] drm/vkms: Suppress context imbalance sparse warning

The functions `vkms_crtc_atomic_begin` and `vkms_crtc_atomic_flush` are
responsible for locking and unlocking a mutex, respectively. Add the
`__acquires` and `__releases` annotations to these functions to prevent
the associated sparse warning about context imbalance.

Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
---
 drivers/gpu/drm/vkms/vkms_crtc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/vkms/vkms_crtc.c b/drivers/gpu/drm/vkms/vkms_crtc.c
index 40b4d084e3ceef9e1e24b7338efdd9253afee8d6..2ad164b518fb93f5b6b86948116ff7ed97770b60 100644
--- a/drivers/gpu/drm/vkms/vkms_crtc.c
+++ b/drivers/gpu/drm/vkms/vkms_crtc.c
@@ -232,6 +232,7 @@ static void vkms_crtc_atomic_disable(struct drm_crtc *crtc,
 
 static void vkms_crtc_atomic_begin(struct drm_crtc *crtc,
 				   struct drm_atomic_state *state)
+	__acquires(&vkms_output->lock)
 {
 	struct vkms_output *vkms_output = drm_crtc_to_vkms_output(crtc);
 
@@ -243,6 +244,7 @@ static void vkms_crtc_atomic_begin(struct drm_crtc *crtc,
 
 static void vkms_crtc_atomic_flush(struct drm_crtc *crtc,
 				   struct drm_atomic_state *state)
+	__releases(&vkms_output->lock)
 {
 	struct vkms_output *vkms_output = drm_crtc_to_vkms_output(crtc);
 

---
base-commit: d2194256049910d286cd6c308c2689df521d8842
change-id: 20240912-vkms-warnings-e0e331bc5e6d

Best regards,
-- 
Louis Chauvet <louis.chauvet@...tlin.com>