linux-kernel - [PATCH 2/5] video: Add missing annotation for cyber2000fb_enable_ddc() and cyber2000fb_disable

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Date:   Fri,  3 Apr 2020 17:05:02 +0100
From:   Jules Irenge <jbi.octave@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     boqun.feng@...il.com, Russell King <linux@...linux.org.uk>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        linux-arm-kernel@...ts.infradead.org (moderated list:CYBERPRO FB DRIVER),
        dri-devel@...ts.freedesktop.org (open list:FRAMEBUFFER LAYER),
        linux-fbdev@...r.kernel.org (open list:FRAMEBUFFER LAYER)
Subject: [PATCH 2/5] video: Add missing annotation for cyber2000fb_enable_ddc() and cyber2000fb_disable_ddc()

Sparse reports warnings at cyber2000fb_enable_ddc()
	and cyber2000fb_disable_ddc()

warning: context imbalance in cyber2000fb_enable_ddc()
	- wrong count at exit

warning: context imbalance in cyber2000fb_disable_ddc()
	- unexpected unlock

The root cause is the missing annotation at cyber2000fb_enable_ddc()
	and cyber2000fb_disable_ddc()

Add the missing __acquires(&cfb->reg_b0_lock) annotation
Add the missing __releases(&cfb->reg_b0_lock) annotation

Signed-off-by: Jules Irenge <jbi.octave@...il.com>
---
 drivers/video/fbdev/cyber2000fb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/video/fbdev/cyber2000fb.c b/drivers/video/fbdev/cyber2000fb.c
index 460826a7ad55..513f58f28b0f 100644
--- a/drivers/video/fbdev/cyber2000fb.c
+++ b/drivers/video/fbdev/cyber2000fb.c
@@ -1160,12 +1160,14 @@ EXPORT_SYMBOL(cyber2000fb_detach);
 #define DDC_SDA_IN	(1 << 6)
 
 static void cyber2000fb_enable_ddc(struct cfb_info *cfb)
+	__acquires(&cfb->reg_b0_lock)
 {
 	spin_lock(&cfb->reg_b0_lock);
 	cyber2000fb_writew(0x1bf, 0x3ce, cfb);
 }
 
 static void cyber2000fb_disable_ddc(struct cfb_info *cfb)
+	__releases(&cfb->reg_b0_lock)
 {
 	cyber2000fb_writew(0x0bf, 0x3ce, cfb);
 	spin_unlock(&cfb->reg_b0_lock);
-- 
2.24.1