Merge tag 'drm-misc-next-2021-07-22' of git://anongit.freedesktop.org/drm/drm-misc into drm-next

drm-misc-next for v5.15-rc1:

UAPI Changes:
- Remove sysfs stats for dma-buf attachments, as it causes a performance regression.
  Previous merge is not in a rc kernel yet, so no userspace regression possible.

Cross-subsystem Changes:
- Sanitize user input in kyro's viewport ioctl.
- Use refcount_t in fb_info->count
- Assorted fixes to dma-buf.
- Extend x86 efifb handling to all archs.
- Fix neofb divide by 0.
- Document corpro,gm7123 bridge dt bindings.

Core Changes:
- Slightly rework drm master handling.
- Cleanup vgaarb handling.
- Assorted fixes.

Driver Changes:
- Add support for ws2401 panel.
- Assorted fixes to stm, ast, bochs.
- Demidlayer ingenic irq.

Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/2d0d2fe8-01fc-e216-c3fd-38db9e69944e@linux.intel.com

4 files changed, 10 insertions, 5 deletions

diff --git a/drivers/video/fbdev/arcfb.c b/drivers/video/fbdev/arcfb.c
index 1447324ed0b6..45e64016db32 100644
--- a/drivers/video/fbdev/arcfb.c
+++ b/drivers/video/fbdev/arcfb.c
@@ -446,7 +446,7 @@ static ssize_t arcfb_write(struct fb_info *info, const char __user *buf,
 	/* modded from epson 1355 */
 
 	unsigned long p;
-	int err=-EINVAL;
+	int err;
 	unsigned int fbmemlength,x,y,w,h, bitppos, startpos, endpos, bitcount;
 	struct arcfb_par *par;
 	unsigned int xres;
diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
index 1c855145711b..71fb710f1ce3 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -67,7 +67,7 @@ static struct fb_info *get_fb_info(unsigned int idx)
 	mutex_lock(&registration_lock);
 	fb_info = registered_fb[idx];
 	if (fb_info)
-		atomic_inc(&fb_info->count);
+		refcount_inc(&fb_info->count);
 	mutex_unlock(&registration_lock);
 
 	return fb_info;
@@ -75,7 +75,7 @@ static struct fb_info *get_fb_info(unsigned int idx)
 
 static void put_fb_info(struct fb_info *fb_info)
 {
-	if (!atomic_dec_and_test(&fb_info->count))
+	if (!refcount_dec_and_test(&fb_info->count))
 		return;
 	if (fb_info->fbops->fb_destroy)
 		fb_info->fbops->fb_destroy(fb_info);
@@ -1592,7 +1592,7 @@ static int do_register_framebuffer(struct fb_info *fb_info)
 		if (!registered_fb[i])
 			break;
 	fb_info->node = i;
-	atomic_set(&fb_info->count, 1);
+	refcount_set(&fb_info->count, 1);
 	mutex_init(&fb_info->lock);
 	mutex_init(&fb_info->mm_lock);
 
diff --git a/drivers/video/fbdev/kyro/fbdev.c b/drivers/video/fbdev/kyro/fbdev.c
index 8fbde92ae8b9..4b8c7c16b1df 100644
--- a/drivers/video/fbdev/kyro/fbdev.c
+++ b/drivers/video/fbdev/kyro/fbdev.c
@@ -372,6 +372,11 @@ static int kyro_dev_overlay_viewport_set(u32 x, u32 y, u32 ulWidth, u32 ulHeight
 		/* probably haven't called CreateOverlay yet */
 		return -EINVAL;
 
+	if (ulWidth == 0 || ulWidth == 0xffffffff ||
+	    ulHeight == 0 || ulHeight == 0xffffffff ||
+	    (x < 2 && ulWidth + 2 == 0))
+		return -EINVAL;
+
 	/* Stop Ramdac Output */
 	DisableRamdacOutput(deviceInfo.pSTGReg);
 
diff --git a/drivers/video/fbdev/neofb.c b/drivers/video/fbdev/neofb.c
index c0f4f402da3f..966df2a07360 100644
--- a/drivers/video/fbdev/neofb.c
+++ b/drivers/video/fbdev/neofb.c
@@ -585,7 +585,7 @@ neofb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 
 	DBG("neofb_check_var");
 
-	if (PICOS2KHZ(var->pixclock) > par->maxClock)
+	if (var->pixclock && PICOS2KHZ(var->pixclock) > par->maxClock)
 		return -EINVAL;
 
 	/* Is the mode larger than the LCD panel? */