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path: root/drivers/video/fb_defio.c
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Diffstat (limited to 'drivers/video/fb_defio.c')
-rw-r--r--drivers/video/fb_defio.c27
1 files changed, 22 insertions, 5 deletions
diff --git a/drivers/video/fb_defio.c b/drivers/video/fb_defio.c
index 4835bdc4e9f1..082026546aee 100644
--- a/drivers/video/fb_defio.c
+++ b/drivers/video/fb_defio.c
@@ -24,6 +24,19 @@
#include <linux/rmap.h>
#include <linux/pagemap.h>
+struct page *fb_deferred_io_page(struct fb_info *info, unsigned long offs)
+{
+ void *screen_base = (void __force *) info->screen_base;
+ struct page *page;
+
+ if (is_vmalloc_addr(screen_base + offs))
+ page = vmalloc_to_page(screen_base + offs);
+ else
+ page = pfn_to_page((info->fix.smem_start + offs) >> PAGE_SHIFT);
+
+ return page;
+}
+
/* this is to find and return the vmalloc-ed fb pages */
static int fb_deferred_io_fault(struct vm_area_struct *vma,
struct vm_fault *vmf)
@@ -31,14 +44,12 @@ static int fb_deferred_io_fault(struct vm_area_struct *vma,
unsigned long offset;
struct page *page;
struct fb_info *info = vma->vm_private_data;
- /* info->screen_base is virtual memory */
- void *screen_base = (void __force *) info->screen_base;
offset = vmf->pgoff << PAGE_SHIFT;
if (offset >= info->fix.smem_len)
return VM_FAULT_SIGBUS;
- page = vmalloc_to_page(screen_base + offset);
+ page = fb_deferred_io_page(info, offset);
if (!page)
return VM_FAULT_SIGBUS;
@@ -60,6 +71,10 @@ int fb_deferred_io_fsync(struct file *file, struct dentry *dentry, int datasync)
{
struct fb_info *info = file->private_data;
+ /* Skip if deferred io is complied-in but disabled on this fbdev */
+ if (!info->fbdefio)
+ return 0;
+
/* Kill off the delayed work */
cancel_rearming_delayed_work(&info->deferred_work);
@@ -184,7 +199,6 @@ EXPORT_SYMBOL_GPL(fb_deferred_io_open);
void fb_deferred_io_cleanup(struct fb_info *info)
{
- void *screen_base = (void __force *) info->screen_base;
struct fb_deferred_io *fbdefio = info->fbdefio;
struct page *page;
int i;
@@ -195,9 +209,12 @@ void fb_deferred_io_cleanup(struct fb_info *info)
/* clear out the mapping that we setup */
for (i = 0 ; i < info->fix.smem_len; i += PAGE_SIZE) {
- page = vmalloc_to_page(screen_base + i);
+ page = fb_deferred_io_page(info, i);
page->mapping = NULL;
}
+
+ info->fbops->fb_mmap = NULL;
+ mutex_destroy(&fbdefio->lock);
}
EXPORT_SYMBOL_GPL(fb_deferred_io_cleanup);