fbdev: add mutex for fb_mmap locking

[mirror_ubuntu-bionic-kernel.git] / drivers / video / platinumfb.c

diff --git a/drivers/video/platinumfb.c b/drivers/video/platinumfb.c
index cbe71a5338d0db2956e04919d62201ca59a47348..bacfabd9ce1653825e14e85a6d702b067f54d9c6 100644 (file)
--- a/drivers/video/platinumfb.c
+++ b/drivers/video/platinumfb.c
@@ -31,11 +31,11 @@
 #include <linux/fb.h>
 #include <linux/init.h>
 #include <linux/nvram.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
 #include <asm/io.h>
 #include <asm/prom.h>
 #include <asm/pgtable.h>
-#include <asm/of_device.h>
-#include <asm/of_platform.h>
 
 #include "macmodes.h"
 #include "platinumfb.h"
@@ -141,7 +141,9 @@ static int platinumfb_set_par (struct fb_info *info)
                offset = 0x10;
 
        info->screen_base = pinfo->frame_buffer + init->fb_offset + offset;
+       mutex_lock(&info->mm_lock);
        info->fix.smem_start = (pinfo->frame_buffer_phys) + init->fb_offset + offset;
+       mutex_unlock(&info->mm_lock);
        info->fix.visual = (pinfo->cmode == CMODE_8) ?
                FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_DIRECTCOLOR;
        info->fix.line_length = vmode_attrs[pinfo->vmode-1].hres * (1<<pinfo->cmode)