linux-kernel - [PATCH] staging: sm750fb: fix sparse warning for lock

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Date:	Wed,  5 Aug 2015 21:26:44 +0800
From:	Peng Fan <van.freenix@...il.com>
To:	sudipm.mukherjee@...il.com, teddy.wang@...iconmotion.com,
	gregkh@...uxfoundation.org
Cc:	linux-fbdev@...r.kernel.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, van.freenix@...il.com
Subject: [PATCH] staging: sm750fb: fix sparse warning for lock

Use __acquire() and __release() in the right place to silence the sparse
lock checking warning.

drivers/staging/sm750fb/sm750.c:177:13: warning: context imbalance in 'lynxfb_ops_fillrect' - different lock contexts for basic block
drivers/staging/sm750fb/sm750.c:243:9: warning: context imbalance in 'lynxfb_ops_copyarea' - different lock contexts for basic block
drivers/staging/sm750fb/sm750.c:247:13: warning: context imbalance in 'lynxfb_ops_imageblit' - different lock contexts for basic block

Signed-off-by: Peng Fan <van.freenix@...il.com>
Cc: Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc: Teddy Wang <teddy.wang@...iconmotion.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/staging/sm750fb/sm750.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/staging/sm750fb/sm750.c b/drivers/staging/sm750fb/sm750.c
index 8e201f1..5ba1c06 100644
--- a/drivers/staging/sm750fb/sm750.c
+++ b/drivers/staging/sm750fb/sm750.c
@@ -203,6 +203,8 @@ static void lynxfb_ops_fillrect(struct fb_info *info,
 	 */
 	if (share->dual)
 		spin_lock(&share->slock);
+	else
+		__acquire(&share->slock);
 
 	share->accel.de_fillrect(&share->accel,
 				 base, pitch, Bpp,
@@ -211,6 +213,8 @@ static void lynxfb_ops_fillrect(struct fb_info *info,
 				 color, rop);
 	if (share->dual)
 		spin_unlock(&share->slock);
+	else
+		__release(&share->slock);
 }
 
 static void lynxfb_ops_copyarea(struct fb_info *info,
@@ -235,6 +239,8 @@ static void lynxfb_ops_copyarea(struct fb_info *info,
 	 */
 	if (share->dual)
 		spin_lock(&share->slock);
+	else
+		__acquire(&share->slock);
 
 	share->accel.de_copyarea(&share->accel,
 				 base, pitch, region->sx, region->sy,
@@ -242,6 +248,8 @@ static void lynxfb_ops_copyarea(struct fb_info *info,
 				 region->width, region->height, HW_ROP2_COPY);
 	if (share->dual)
 		spin_unlock(&share->slock);
+	else
+		__release(&share->slock);
 }
 
 static void lynxfb_ops_imageblit(struct fb_info *info,
@@ -282,6 +290,8 @@ _do_work:
 	 */
 	if (share->dual)
 		spin_lock(&share->slock);
+	else
+		__acquire(&share->slock);
 
 	share->accel.de_imageblit(&share->accel,
 				  image->data, image->width>>3, 0,
@@ -291,6 +301,8 @@ _do_work:
 				  fgcol, bgcol, HW_ROP2_COPY);
 	if (share->dual)
 		spin_unlock(&share->slock);
+	else
+		__release(&share->slock);
 }
 
 static int lynxfb_ops_pan_display(struct fb_var_screeninfo *var,
-- 
1.8.4

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