1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/video/w100fb.c b/drivers/video/w100fb.c
index d0674f1e3f10..8a141c2c637b 100644
--- a/drivers/video/w100fb.c
+++ b/drivers/video/w100fb.c
@@ -523,6 +523,7 @@ static int w100fb_set_par(struct fb_info *info)
                 info->fix.ywrapstep = 0;
                 info->fix.line_length = par->xres * BITS_PER_PIXEL / 8;
 
+                mutex_lock(&info->mm_lock);
                 if ((par->xres*par->yres*BITS_PER_PIXEL/8) > (MEM_INT_SIZE+1)) {
                         par->extmem_active = 1;
                         info->fix.smem_len = par->mach->mem->size+1;
@@ -530,6 +531,7 @@ static int w100fb_set_par(struct fb_info *info)
                         par->extmem_active = 0;
                         info->fix.smem_len = MEM_INT_SIZE+1;
                 }
+                mutex_unlock(&info->mm_lock);
 
                 w100fb_activate_var(par);
         }