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Diffstat (limited to 'target/linux/omap24xx/patches-3.3/309-omapfb-circular-mutex-workaround.patch')
-rw-r--r--target/linux/omap24xx/patches-3.3/309-omapfb-circular-mutex-workaround.patch41
1 files changed, 41 insertions, 0 deletions
diff --git a/target/linux/omap24xx/patches-3.3/309-omapfb-circular-mutex-workaround.patch b/target/linux/omap24xx/patches-3.3/309-omapfb-circular-mutex-workaround.patch
new file mode 100644
index 000000000..e5e083e24
--- /dev/null
+++ b/target/linux/omap24xx/patches-3.3/309-omapfb-circular-mutex-workaround.patch
@@ -0,0 +1,41 @@
+--- a/drivers/video/omap/omapfb_main.c
++++ b/drivers/video/omap/omapfb_main.c
+@@ -420,10 +420,10 @@ static void set_fb_fix(struct fb_info *f
+ fbi->screen_base = rg->vaddr;
+
+ if (!from_init) {
+- mutex_lock(&fbi->mm_lock);
++ preempt_disable();
+ fix->smem_start = rg->paddr;
+ fix->smem_len = rg->size;
+- mutex_unlock(&fbi->mm_lock);
++ preempt_enable();
+ } else {
+ fix->smem_start = rg->paddr;
+ fix->smem_len = rg->size;
+@@ -933,10 +933,10 @@ static int omapfb_setup_mem(struct fb_in
+ * plane memory is dealloce'd, the other
+ * screen parameters in var / fix are invalid.
+ */
+- mutex_lock(&fbi->mm_lock);
++ preempt_disable();
+ fbi->fix.smem_start = 0;
+ fbi->fix.smem_len = 0;
+- mutex_unlock(&fbi->mm_lock);
++ preempt_enable();
+ }
+ }
+ }
+--- a/drivers/video/fbmem.c
++++ b/drivers/video/fbmem.c
+@@ -1383,8 +1383,10 @@ fb_mmap(struct file *file, struct vm_are
+ }
+
+ /* frame buffer memory */
++ preempt_disable();
+ start = info->fix.smem_start;
+ len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
++ preempt_enable();
+ if (off >= len) {
+ /* memory mapped io */
+ off -= len;