Re: [PATCH 1/5] lib/scatterlist: Fix offset type in sg_alloc_table_from_pages

Marek Szyprowski
2016-10-24T07:21:34Z

Hi Tvrtko,

On 2016-10-21 16:11, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
>
> Scatterlist entries have an unsigned int for the offset so
> correct the sg_alloc_table_from_pages function accordingly.
>
> Since these are offsets withing a page, unsigned int is
> wide enough.
>
> Also converts callers which were using unsigned long locally
> with the lower_32_bits annotation to make it explicitly
> clear what is happening.
>
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
> Cc: Pawel Osciak <pawel@osciak.com>
> Cc: Marek Szyprowski <m.szyprowski@samsung.com>
> Cc: Kyungmin Park <kyungmin.park@samsung.com>
> Cc: Tomasz Stanislawski <t.stanislaws@samsung.com>
> Cc: Matt Porter <mporter@kernel.crashing.org>
> Cc: Alexandre Bounine <alexandre.bounine@idt.com>
> Cc: linux-media@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org

Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>

> ---
> drivers/media/v4l2-core/videobuf2-dma-contig.c | 4 ++--
> drivers/rapidio/devices/rio_mport_cdev.c | 4 ++--
> include/linux/scatterlist.h | 2 +-
> lib/scatterlist.c | 2 +-
> 4 files changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/media/v4l2-core/videobuf2-dma-contig.c b/drivers/media/v4l2-core/videobuf2-dma-contig.c
> index fb6a177be461..a3aac7533241 100644
> --- a/drivers/media/v4l2-core/videobuf2-dma-contig.c
> +++ b/drivers/media/v4l2-core/videobuf2-dma-contig.c
> @@ -478,7 +478,7 @@ static void *vb2_dc_get_userptr(struct device *dev, unsigned long vaddr,
> {
> struct vb2_dc_buf *buf;
> struct frame_vector *vec;
> - unsigned long offset;
> + unsigned int offset;
> int n_pages, i;
> int ret = 0;
> struct sg_table *sgt;
> @@ -506,7 +506,7 @@ static void *vb2_dc_get_userptr(struct device *dev, unsigned long vaddr,
> buf->dev = dev;
> buf->dma_dir = dma_dir;
>
> - offset = vaddr & ~PAGE_MASK;
> + offset = lower_32_bits(vaddr & ~PAGE_MASK);
> vec = vb2_create_framevec(vaddr, size, dma_dir == DMA_FROM_DEVICE);
> if (IS_ERR(vec)) {
> ret = PTR_ERR(vec);
> diff --git a/drivers/rapidio/devices/rio_mport_cdev.c b/drivers/rapidio/devices/rio_mport_cdev.c
> index 436dfe871d32..f545cf20561f 100644
> --- a/drivers/rapidio/devices/rio_mport_cdev.c
> +++ b/drivers/rapidio/devices/rio_mport_cdev.c
> @@ -876,10 +876,10 @@ rio_dma_transfer(struct file *filp, u32 transfer_mode,
> * offset within the internal buffer specified by handle parameter.
> */
> if (xfer->loc_addr) {
> - unsigned long offset;
> + unsigned int offset;
> long pinned;
>
> - offset = (unsigned long)(uintptr_t)xfer->loc_addr & ~PAGE_MASK;
> + offset = lower_32_bits(xfer->loc_addr & ~PAGE_MASK);
> nr_pages = PAGE_ALIGN(xfer->length + offset) >> PAGE_SHIFT;
>
> page_list = kmalloc_array(nr_pages,
> diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
> index cb3c8fe6acd7..c981bee1a3ae 100644
> --- a/include/linux/scatterlist.h
> +++ b/include/linux/scatterlist.h
> @@ -263,7 +263,7 @@ int __sg_alloc_table(struct sg_table *, unsigned int, unsigned int,
> int sg_alloc_table(struct sg_table *, unsigned int, gfp_t);
> int sg_alloc_table_from_pages(struct sg_table *sgt,
> struct page **pages, unsigned int n_pages,
> - unsigned long offset, unsigned long size,
> + unsigned int offset, unsigned long size,
> gfp_t gfp_mask);
>
> size_t sg_copy_buffer(struct scatterlist *sgl, unsigned int nents, void *buf,
> diff --git a/lib/scatterlist.c b/lib/scatterlist.c
> index 004fc70fc56a..e05e7fc98892 100644
> --- a/lib/scatterlist.c
> +++ b/lib/scatterlist.c
> @@ -391,7 +391,7 @@ EXPORT_SYMBOL(sg_alloc_table);
> */
> int sg_alloc_table_from_pages(struct sg_table *sgt,
> struct page **pages, unsigned int n_pages,
> - unsigned long offset, unsigned long size,
> + unsigned int offset, unsigned long size,
> gfp_t gfp_mask)
> {
> unsigned int chunks;

Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland