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Date: Wed, 7 Aug 2019 10:51:17 +0200
From: Hans Verkuil <hverkuil-cisco@...all.nl>
To: john.hubbard@...il.com, Andrew Morton <akpm@...ux-foundation.org>
Cc: Christoph Hellwig <hch@...radead.org>,
Dan Williams <dan.j.williams@...el.com>,
Dave Chinner <david@...morbit.com>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Ira Weiny <ira.weiny@...el.com>, Jan Kara <jack@...e.cz>,
Jason Gunthorpe <jgg@...pe.ca>,
Jérôme Glisse <jglisse@...hat.com>,
LKML <linux-kernel@...r.kernel.org>,
amd-gfx@...ts.freedesktop.org, ceph-devel@...r.kernel.org,
devel@...verdev.osuosl.org, devel@...ts.orangefs.org,
dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
kvm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-block@...r.kernel.org, linux-crypto@...r.kernel.org,
linux-fbdev@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-media@...r.kernel.org, linux-mm@...ck.org,
linux-nfs@...r.kernel.org, linux-rdma@...r.kernel.org,
linux-rpi-kernel@...ts.infradead.org, linux-xfs@...r.kernel.org,
netdev@...r.kernel.org, rds-devel@....oracle.com,
sparclinux@...r.kernel.org, x86@...nel.org,
xen-devel@...ts.xenproject.org, John Hubbard <jhubbard@...dia.com>,
Andy Walls <awalls@...metrocast.net>,
Mauro Carvalho Chehab <mchehab@...nel.org>
Subject: Re: [PATCH v3 10/41] media/ivtv: convert put_page() to
put_user_page*()
On 8/7/19 3:33 AM, john.hubbard@...il.com wrote:
> From: John Hubbard <jhubbard@...dia.com>
>
> For pages that were retained via get_user_pages*(), release those pages
> via the new put_user_page*() routines, instead of via put_page() or
> release_pages().
>
> This is part a tree-wide conversion, as described in commit fc1d8e7cca2d
> ("mm: introduce put_user_page*(), placeholder versions").
>
> Cc: Andy Walls <awalls@...metrocast.net>
> Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
> Cc: linux-media@...r.kernel.org
> Signed-off-by: John Hubbard <jhubbard@...dia.com>
Acked-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Regards,
Hans
> ---
> drivers/media/pci/ivtv/ivtv-udma.c | 14 ++++----------
> drivers/media/pci/ivtv/ivtv-yuv.c | 11 +++--------
> 2 files changed, 7 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/media/pci/ivtv/ivtv-udma.c b/drivers/media/pci/ivtv/ivtv-udma.c
> index 5f8883031c9c..7c7f33c2412b 100644
> --- a/drivers/media/pci/ivtv/ivtv-udma.c
> +++ b/drivers/media/pci/ivtv/ivtv-udma.c
> @@ -92,7 +92,7 @@ int ivtv_udma_setup(struct ivtv *itv, unsigned long ivtv_dest_addr,
> {
> struct ivtv_dma_page_info user_dma;
> struct ivtv_user_dma *dma = &itv->udma;
> - int i, err;
> + int err;
>
> IVTV_DEBUG_DMA("ivtv_udma_setup, dst: 0x%08x\n", (unsigned int)ivtv_dest_addr);
>
> @@ -119,8 +119,7 @@ int ivtv_udma_setup(struct ivtv *itv, unsigned long ivtv_dest_addr,
> IVTV_DEBUG_WARN("failed to map user pages, returned %d instead of %d\n",
> err, user_dma.page_count);
> if (err >= 0) {
> - for (i = 0; i < err; i++)
> - put_page(dma->map[i]);
> + put_user_pages(dma->map, err);
> return -EINVAL;
> }
> return err;
> @@ -130,9 +129,7 @@ int ivtv_udma_setup(struct ivtv *itv, unsigned long ivtv_dest_addr,
>
> /* Fill SG List with new values */
> if (ivtv_udma_fill_sg_list(dma, &user_dma, 0) < 0) {
> - for (i = 0; i < dma->page_count; i++) {
> - put_page(dma->map[i]);
> - }
> + put_user_pages(dma->map, dma->page_count);
> dma->page_count = 0;
> return -ENOMEM;
> }
> @@ -153,7 +150,6 @@ int ivtv_udma_setup(struct ivtv *itv, unsigned long ivtv_dest_addr,
> void ivtv_udma_unmap(struct ivtv *itv)
> {
> struct ivtv_user_dma *dma = &itv->udma;
> - int i;
>
> IVTV_DEBUG_INFO("ivtv_unmap_user_dma\n");
>
> @@ -170,9 +166,7 @@ void ivtv_udma_unmap(struct ivtv *itv)
> ivtv_udma_sync_for_cpu(itv);
>
> /* Release User Pages */
> - for (i = 0; i < dma->page_count; i++) {
> - put_page(dma->map[i]);
> - }
> + put_user_pages(dma->map, dma->page_count);
> dma->page_count = 0;
> }
>
> diff --git a/drivers/media/pci/ivtv/ivtv-yuv.c b/drivers/media/pci/ivtv/ivtv-yuv.c
> index cd2fe2d444c0..2c61a11d391d 100644
> --- a/drivers/media/pci/ivtv/ivtv-yuv.c
> +++ b/drivers/media/pci/ivtv/ivtv-yuv.c
> @@ -30,7 +30,6 @@ static int ivtv_yuv_prep_user_dma(struct ivtv *itv, struct ivtv_user_dma *dma,
> struct yuv_playback_info *yi = &itv->yuv_info;
> u8 frame = yi->draw_frame;
> struct yuv_frame_info *f = &yi->new_frame_info[frame];
> - int i;
> int y_pages, uv_pages;
> unsigned long y_buffer_offset, uv_buffer_offset;
> int y_decode_height, uv_decode_height, y_size;
> @@ -81,8 +80,7 @@ static int ivtv_yuv_prep_user_dma(struct ivtv *itv, struct ivtv_user_dma *dma,
> uv_pages, uv_dma.page_count);
>
> if (uv_pages >= 0) {
> - for (i = 0; i < uv_pages; i++)
> - put_page(dma->map[y_pages + i]);
> + put_user_pages(&dma->map[y_pages], uv_pages);
> rc = -EFAULT;
> } else {
> rc = uv_pages;
> @@ -93,8 +91,7 @@ static int ivtv_yuv_prep_user_dma(struct ivtv *itv, struct ivtv_user_dma *dma,
> y_pages, y_dma.page_count);
> }
> if (y_pages >= 0) {
> - for (i = 0; i < y_pages; i++)
> - put_page(dma->map[i]);
> + put_user_pages(dma->map, y_pages);
> /*
> * Inherit the -EFAULT from rc's
> * initialization, but allow it to be
> @@ -112,9 +109,7 @@ static int ivtv_yuv_prep_user_dma(struct ivtv *itv, struct ivtv_user_dma *dma,
> /* Fill & map SG List */
> if (ivtv_udma_fill_sg_list (dma, &uv_dma, ivtv_udma_fill_sg_list (dma, &y_dma, 0)) < 0) {
> IVTV_DEBUG_WARN("could not allocate bounce buffers for highmem userspace buffers\n");
> - for (i = 0; i < dma->page_count; i++) {
> - put_page(dma->map[i]);
> - }
> + put_user_pages(dma->map, dma->page_count);
> dma->page_count = 0;
> return -ENOMEM;
> }
>
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