fbdev: sh_mobile_meram: Validate ICB configuration outside mutex

Validate as much of the requested ICB configuration as possible outside
of the mutex-protected region when registering ICBs.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

diff --git a/drivers/video/sh_mobile_meram.c b/drivers/video/sh_mobile_meram.c
index 85577cf..25a7118 100644 (file)
--- a/drivers/video/sh_mobile_meram.c
+++ b/drivers/video/sh_mobile_meram.c
@@ -410,24 +410,22 @@ static int sh_mobile_meram_register(struct sh_mobile_meram_info *pdata,
                xres, yres, (!pixelformat) ? "yuv" : "rgb",
                base_addr_y, base_addr_c);
 
-       mutex_lock(&priv->lock);
-
        /* we can't handle wider than 8192px */
        if (xres > 8192) {
                dev_err(&pdev->dev, "width exceeding the limit (> 8192).");
-               error = -EINVAL;
-               goto err;
-       }
-
-       if (priv->used_meram_cache_regions + 2 > SH_MOBILE_MERAM_ICB_NUM) {
-               dev_err(&pdev->dev, "no more ICB available.");
-               error = -EINVAL;
-               goto err;
+               return -EINVAL;
        }
 
        /* do we have at least one ICB config? */
        if (cfg->icb[0].marker_icb < 0 || cfg->icb[0].cache_icb < 0) {
                dev_err(&pdev->dev, "at least one ICB is required.");
+               return -EINVAL;
+       }
+
+       mutex_lock(&priv->lock);
+
+       if (priv->used_meram_cache_regions + 2 > SH_MOBILE_MERAM_ICB_NUM) {
+               dev_err(&pdev->dev, "no more ICB available.");
                error = -EINVAL;
                goto err;
        }