[PATCH 2/9] media: omap_vout: Convert omap_vout_uservirt_to_phys() to use get_vaddr_pfns()

[Jan Kara]

Convert omap_vout_uservirt_to_phys() to use get_vaddr_pfns() instead of
hand made mapping of virtual address to physical address. Also the
function leaked page reference from get_user_pages() so fix that by
properly release the reference when omap_vout_buffer_release() is
called.

Signed-off-by: Jan Kara <j...@suse.cz>
---
 drivers/media/platform/omap/omap_vout.c | 63 +++++++++++++++------------------
 1 file changed, 29 insertions(+), 34 deletions(-)

diff --git a/drivers/media/platform/omap/omap_vout.c 
b/drivers/media/platform/omap/omap_vout.c
index dfd0a21a0658..8c5803e4ce15 100644
--- a/drivers/media/platform/omap/omap_vout.c
+++ b/drivers/media/platform/omap/omap_vout.c
@@ -199,43 +199,31 @@ static int omap_vout_try_format(struct v4l2_pix_format 
*pix)
  * omap_vout_uservirt_to_phys: This inline function is used to convert user
  * space virtual address to physical address.
  */
-static u32 omap_vout_uservirt_to_phys(u32 virtp)
+static int omap_vout_get_userptr(struct videobuf_buffer *vb, u32 virtp,
+                                u32 *physp)
 {
-       unsigned long physp = 0;
-       struct vm_area_struct *vma;
-       struct mm_struct *mm = current->mm;
+       struct pinned_pfns *pfns;
+       int ret;
 
        /* For kernel direct-mapped memory, take the easy way */
-       if (virtp >= PAGE_OFFSET)
-               return virt_to_phys((void *) virtp);
-
-       down_read(&current->mm->mmap_sem);
-       vma = find_vma(mm, virtp);
-       if (vma && (vma->vm_flags & VM_IO) && vma->vm_pgoff) {
-               /* this will catch, kernel-allocated, mmaped-to-usermode
-                  addresses */
-               physp = (vma->vm_pgoff << PAGE_SHIFT) + (virtp - vma->vm_start);
-               up_read(&current->mm->mmap_sem);
-       } else {
-               /* otherwise, use get_user_pages() for general userland pages */
-               int res, nr_pages = 1;
-               struct page *pages;
+       if (virtp >= PAGE_OFFSET) {
+               *physp = virt_to_phys((void *)virtp);
+               return 0;
+       }
 
-               res = get_user_pages(current, current->mm, virtp, nr_pages, 1,
-                               0, &pages, NULL);
-               up_read(&current->mm->mmap_sem);
+       pfns = pfns_vector_create(1);
+       if (!pfns)
+               return -ENOMEM;
 
-               if (res == nr_pages) {
-                       physp =  __pa(page_address(&pages[0]) +
-                                       (virtp & ~PAGE_MASK));
-               } else {
-                       printk(KERN_WARNING VOUT_NAME
-                                       "get_user_pages failed\n");
-                       return 0;
-               }
+       ret = get_vaddr_pfns(virtp, 1, 1, 0, pfns);
+       if (ret != 1) {
+               pfns_vector_destroy(pfns);
+               return -EINVAL;
        }
+       *physp = __pfn_to_phys(pfns_vector_pfns(pfns)[0]);
+       vb->priv = pfns;
 
-       return physp;
+       return 0;
 }
 
 /*
@@ -790,11 +778,15 @@ static int omap_vout_buffer_prepare(struct videobuf_queue 
*q,
         * address of the buffer
         */
        if (V4L2_MEMORY_USERPTR == vb->memory) {
+               int ret;
+
                if (0 == vb->baddr)
                        return -EINVAL;
                /* Physical address */
-               vout->queued_buf_addr[vb->i] = (u8 *)
-                       omap_vout_uservirt_to_phys(vb->baddr);
+               ret = omap_vout_get_userptr(vb, vb->baddr,
+                               (u32 *)&vout->queued_buf_addr[vb->i]);
+               if (ret < 0)
+                       return ret;
        } else {
                u32 addr, dma_addr;
                unsigned long size;
@@ -843,9 +835,12 @@ static void omap_vout_buffer_release(struct videobuf_queue 
*q,
        struct omap_vout_device *vout = q->priv_data;
 
        vb->state = VIDEOBUF_NEEDS_INIT;
+       if (vb->memory == V4L2_MEMORY_USERPTR && vb->priv) {
+               struct pinned_pfns *pfns = vb->priv;
 
-       if (V4L2_MEMORY_MMAP != vout->memory)
-               return;
+               put_vaddr_pfns(pfns);
+               pfns_vector_destroy(pfns);
+       }
 }
 
 /*
-- 
1.8.1.4

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