target/linux/omap24xx/patches-3.1/309-omapfb-circular-mutex-workaround.patch

   1 Index: linux-3.1.1/drivers/video/omap/omapfb_main.c
   2 ===================================================================
   3 --- linux-3.1.1.orig/drivers/video/omap/omapfb_main.c   2011-11-11 21:19:27.000000000 +0100
   4 +++ linux-3.1.1/drivers/video/omap/omapfb_main.c        2011-11-16 23:10:16.554325659 +0100
   5 @@ -419,10 +419,10 @@ static void set_fb_fix(struct fb_info *f
   6         fbi->screen_base        = rg->vaddr;
   7
   8         if (!from_init) {
   9 -               mutex_lock(&fbi->mm_lock);
  10 +               preempt_disable();
  11                 fix->smem_start         = rg->paddr;
  12                 fix->smem_len           = rg->size;
  13 -               mutex_unlock(&fbi->mm_lock);
  14 +               preempt_enable();
  15         } else {
  16                 fix->smem_start         = rg->paddr;
  17                 fix->smem_len           = rg->size;
  18 @@ -932,10 +932,10 @@ static int omapfb_setup_mem(struct fb_in
  19                                  * plane memory is dealloce'd, the other
  20                                  * screen parameters in var / fix are invalid.
  21                                  */
  22 -                               mutex_lock(&fbi->mm_lock);
  23 +                               preempt_disable();
  24                                 fbi->fix.smem_start = 0;
  25                                 fbi->fix.smem_len = 0;
  26 -                               mutex_unlock(&fbi->mm_lock);
  27 +                               preempt_enable();
  28                         }
  29                 }
  30         }
  31 Index: linux-3.1.1/drivers/video/fbmem.c
  32 ===================================================================
  33 --- linux-3.1.1.orig/drivers/video/fbmem.c      2011-11-11 21:19:27.000000000 +0100
  34 +++ linux-3.1.1/drivers/video/fbmem.c   2011-11-16 23:20:56.055698968 +0100
  35 @@ -1369,8 +1369,10 @@ fb_mmap(struct file *file, struct vm_are
  36         }
  37
  38         /* frame buffer memory */
  39 +       preempt_disable();
  40         start = info->fix.smem_start;
  41         len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
  42 +       preempt_enable();
  43         if (off >= len) {
  44                 /* memory mapped io */
  45                 off -= len;