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@gmail.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200403160505.2832-3-jbi.octave@gmail.com

diff --git a/drivers/video/fbdev/cyber2000fb.c b/drivers/video/fbdev/cyber2000fb.c
index 460826a7ad551d7efdbf9a1ba8a44c6698e6d63b..513f58f28b0fddcfdd44d6c3f7621464cc552786 100644 (file)
--- 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);