From 8a677b6eddfc3127ea36a710838ecd20502b1cb9 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Mon, 13 Jul 2015 11:55:45 -0300 Subject: [PATCH] [media] 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 [hans.verkuil@cisco.com: remove unused variable] Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/platform/omap/Kconfig | 1 + drivers/media/platform/omap/omap_vout.c | 69 +++++++++++-------------- 2 files changed, 32 insertions(+), 38 deletions(-) diff --git a/drivers/media/platform/omap/Kconfig b/drivers/media/platform/omap/Kconfig index dc2aaab54aef..217d613b0fe7 100644 --- a/drivers/media/platform/omap/Kconfig +++ b/drivers/media/platform/omap/Kconfig @@ -10,6 +10,7 @@ config VIDEO_OMAP2_VOUT select OMAP2_DSS if HAS_IOMEM && ARCH_OMAP2PLUS select OMAP2_VRFB if ARCH_OMAP2 || ARCH_OMAP3 select VIDEO_OMAP2_VOUT_VRFB if VIDEO_OMAP2_VOUT && OMAP2_VRFB + select FRAME_VECTOR default n ---help--- V4L2 Display driver support for OMAP2/3 based boards. diff --git a/drivers/media/platform/omap/omap_vout.c b/drivers/media/platform/omap/omap_vout.c index f09c5f17a42f..7feb6394f111 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 frame_vector *vec; + int ret; /* For kernel direct-mapped memory, take the easy way */ - if (virtp >= PAGE_OFFSET) - return virt_to_phys((void *) virtp); - - down_read(¤t->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(¤t->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(¤t->mm->mmap_sem); + vec = frame_vector_create(1); + if (!vec) + 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_frames(virtp, 1, true, false, vec); + if (ret != 1) { + frame_vector_destroy(vec); + return -EINVAL; } + *physp = __pfn_to_phys(frame_vector_pfns(vec)[0]); + vb->priv = vec; - return physp; + return 0; } /* @@ -784,11 +772,15 @@ 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; @@ -834,12 +826,13 @@ static void omap_vout_buffer_queue(struct videobuf_queue *q, static void omap_vout_buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb) { - struct omap_vout_device *vout = q->priv_data; - vb->state = VIDEOBUF_NEEDS_INIT; + if (vb->memory == V4L2_MEMORY_USERPTR && vb->priv) { + struct frame_vector *vec = vb->priv; - if (V4L2_MEMORY_MMAP != vout->memory) - return; + put_vaddr_frames(vec); + frame_vector_destroy(vec); + } } /* -- 2.20.1