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omap24xx: Add workaround for omapfb locking bug.

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SVN-Revision: 29201
This commit is contained in:
Michael Büsch 2011-11-16 22:34:38 +00:00
parent 6aac54298b
commit 06c986984e
1 changed files with 45 additions and 0 deletions
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45
target/linux/omap24xx/patches-3.1/309-omapfb-circular-mutex-workaround.patch Normal file
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@ -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;