Linux-libre 4.2-gnu

1 files changed, 24 insertions, 15 deletions

diff --git a/drivers/gpu/drm/omapdrm/omap_fb.c b/drivers/gpu/drm/omapdrm/omap_fb.c
index b2c1a29cc..51b1219af 100644
--- a/drivers/gpu/drm/omapdrm/omap_fb.c
+++ b/drivers/gpu/drm/omapdrm/omap_fb.c
@@ -17,11 +17,11 @@
  * this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "omap_drv.h"
-#include "omap_dmm_tiler.h"
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
 
-#include "drm_crtc.h"
-#include "drm_crtc_helper.h"
+#include "omap_dmm_tiler.h"
+#include "omap_drv.h"
 
 /*
  * framebuffer funcs
@@ -89,6 +89,8 @@ struct omap_framebuffer {
 	int pin_count;
 	const struct format *format;
 	struct plane planes[4];
+	/* lock for pinning (pin_count and planes.paddr) */
+	struct mutex lock;
 };
 
 static int omap_framebuffer_create_handle(struct drm_framebuffer *fb,
@@ -250,8 +252,11 @@ int omap_framebuffer_pin(struct drm_framebuffer *fb)
 	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
 	int ret, i, n = drm_format_num_planes(fb->pixel_format);
 
+	mutex_lock(&omap_fb->lock);
+
 	if (omap_fb->pin_count > 0) {
 		omap_fb->pin_count++;
+		mutex_unlock(&omap_fb->lock);
 		return 0;
 	}
 
@@ -265,6 +270,8 @@ int omap_framebuffer_pin(struct drm_framebuffer *fb)
 
 	omap_fb->pin_count++;
 
+	mutex_unlock(&omap_fb->lock);
+
 	return 0;
 
 fail:
@@ -274,32 +281,33 @@ fail:
 		plane->paddr = 0;
 	}
 
+	mutex_unlock(&omap_fb->lock);
+
 	return ret;
 }
 
 /* unpin, no longer being scanned out: */
-int omap_framebuffer_unpin(struct drm_framebuffer *fb)
+void omap_framebuffer_unpin(struct drm_framebuffer *fb)
 {
 	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
-	int ret, i, n = drm_format_num_planes(fb->pixel_format);
+	int i, n = drm_format_num_planes(fb->pixel_format);
+
+	mutex_lock(&omap_fb->lock);
 
 	omap_fb->pin_count--;
 
-	if (omap_fb->pin_count > 0)
-		return 0;
+	if (omap_fb->pin_count > 0) {
+		mutex_unlock(&omap_fb->lock);
+		return;
+	}
 
 	for (i = 0; i < n; i++) {
 		struct plane *plane = &omap_fb->planes[i];
-		ret = omap_gem_put_paddr(plane->bo);
-		if (ret)
-			goto fail;
+		omap_gem_put_paddr(plane->bo);
 		plane->paddr = 0;
 	}
 
-	return 0;
-
-fail:
-	return ret;
+	mutex_unlock(&omap_fb->lock);
 }
 
 struct drm_gem_object *omap_framebuffer_bo(struct drm_framebuffer *fb, int p)
@@ -411,6 +419,7 @@ struct drm_framebuffer *omap_framebuffer_init(struct drm_device *dev,
 
 	fb = &omap_fb->base;
 	omap_fb->format = format;
+	mutex_init(&omap_fb->lock);
 
 	for (i = 0; i < n; i++) {
 		struct plane *plane = &omap_fb->planes[i];