[PATCH 3/9] media: omap_vout: Convert omap_vout_uservirt_to_phys() to use get_vaddr_pfns()

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 jack@suse.cz --- drivers/media/platform/omap/omap_vout.c | 67 +++++++++++++++------------------ 1 file changed, 31 insertions(+), 36 deletions(-)

diff --git a/drivers/media/platform/omap/omap_vout.c b/drivers/media/platform/omap/omap_vout.c index ba2d8f973d58..e7d342bb71dd 100644 --- a/drivers/media/platform/omap/omap_vout.c +++ b/drivers/media/platform/omap/omap_vout.c @@ -195,46 +195,34 @@ 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. + * omap_vout_get_userptr: Convert user space virtual address to physical + * address. */ -static unsigned long omap_vout_uservirt_to_phys(unsigned long 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; }

/* @@ -788,11 +776,15 @@ 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 { unsigned long addr, dma_addr; unsigned long size; @@ -841,9 +833,12 @@ 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); + } }

/*