From 06c986984eb85bb8c6b936cdb0df208757341bb9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Michael=20B=C3=BCsch?= <mb@bu3sch.de>
Date: Wed, 16 Nov 2011 22:34:38 +0000
Subject: [PATCH] omap24xx: Add workaround for omapfb locking bug.
SVN-Revision: 29201
---
...309-omapfb-circular-mutex-workaround.patch | 45 +++++++++++++++++++
1 file changed, 45 insertions(+)
create mode 100644 target/linux/omap24xx/patches-3.1/309-omapfb-circular-mutex-workaround.patch
diff --git a/target/linux/omap24xx/patches-3.1/309-omapfb-circular-mutex-workaround.patch b/target/linux/omap24xx/patches-3.1/309-omapfb-circular-mutex-workaround.patch
new file mode 100644
index 0000000000..161698ddd7
--- /dev/null
+++ b/target/linux/omap24xx/patches-3.1/309-omapfb-circular-mutex-workaround.patch
@@ -0,0 +1,45 @@
+Index: linux-3.1.1/drivers/video/omap/omapfb_main.c
+===================================================================
+--- linux-3.1.1.orig/drivers/video/omap/omapfb_main.c 2011-11-11 21:19:27.000000000 +0100
++++ linux-3.1.1/drivers/video/omap/omapfb_main.c 2011-11-16 23:10:16.554325659 +0100
+@@ -419,10 +419,10 @@ 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;
+@@ -932,10 +932,10 @@ 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();
+ }
+ }
+ }
+Index: linux-3.1.1/drivers/video/fbmem.c
+===================================================================
+--- linux-3.1.1.orig/drivers/video/fbmem.c 2011-11-11 21:19:27.000000000 +0100
++++ linux-3.1.1/drivers/video/fbmem.c 2011-11-16 23:20:56.055698968 +0100
+@@ -1369,8 +1369,10 @@ 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;
--
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