From: Marek Szyprowski <m.szyprowski@samsung.com>
To: dri-devel@lists.freedesktop.org,
iommu@lists.linux-foundation.org, linaro-mm-sig@lists.linaro.org,
linux-kernel@vger.kernel.org
Cc: Pawel Osciak <pawel@osciak.com>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
David Airlie <airlied@linux.ie>,
linux-media@vger.kernel.org,
Kyungmin Park <kyungmin.park@samsung.com>,
Daniel Vetter <daniel@ffwll.ch>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Christoph Hellwig <hch@lst.de>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH v9 32/32] videobuf2: use sgtable-based scatterlist wrappers
Date: Wed, 26 Aug 2020 08:33:16 +0200 [thread overview]
Message-ID: <20200826063316.23486-33-m.szyprowski@samsung.com> (raw)
In-Reply-To: <20200826063316.23486-1-m.szyprowski@samsung.com>
Use recently introduced common wrappers operating directly on the struct
sg_table objects and scatterlist page iterators to make the code a bit
more compact, robust, easier to follow and copy/paste safe.
No functional change, because the code already properly did all the
scaterlist related calls.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
---
.../common/videobuf2/videobuf2-dma-contig.c | 34 ++++++++-----------
.../media/common/videobuf2/videobuf2-dma-sg.c | 32 +++++++----------
.../common/videobuf2/videobuf2-vmalloc.c | 12 +++----
3 files changed, 31 insertions(+), 47 deletions(-)
diff --git a/drivers/media/common/videobuf2/videobuf2-dma-contig.c b/drivers/media/common/videobuf2/videobuf2-dma-contig.c
index ec3446cc45b8..1b242d844dde 100644
--- a/drivers/media/common/videobuf2/videobuf2-dma-contig.c
+++ b/drivers/media/common/videobuf2/videobuf2-dma-contig.c
@@ -58,10 +58,10 @@ static unsigned long vb2_dc_get_contiguous_size(struct sg_table *sgt)
unsigned int i;
unsigned long size = 0;
- for_each_sg(sgt->sgl, s, sgt->nents, i) {
+ for_each_sgtable_dma_sg(sgt, s, i) {
if (sg_dma_address(s) != expected)
break;
- expected = sg_dma_address(s) + sg_dma_len(s);
+ expected += sg_dma_len(s);
size += sg_dma_len(s);
}
return size;
@@ -103,8 +103,7 @@ static void vb2_dc_prepare(void *buf_priv)
if (!sgt)
return;
- dma_sync_sg_for_device(buf->dev, sgt->sgl, sgt->orig_nents,
- buf->dma_dir);
+ dma_sync_sgtable_for_device(buf->dev, sgt, buf->dma_dir);
}
static void vb2_dc_finish(void *buf_priv)
@@ -115,7 +114,7 @@ static void vb2_dc_finish(void *buf_priv)
if (!sgt)
return;
- dma_sync_sg_for_cpu(buf->dev, sgt->sgl, sgt->orig_nents, buf->dma_dir);
+ dma_sync_sgtable_for_cpu(buf->dev, sgt, buf->dma_dir);
}
/*********************************************/
@@ -275,8 +274,8 @@ static void vb2_dc_dmabuf_ops_detach(struct dma_buf *dbuf,
* memory locations do not require any explicit cache
* maintenance prior or after being used by the device.
*/
- dma_unmap_sg_attrs(db_attach->dev, sgt->sgl, sgt->orig_nents,
- attach->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
+ dma_unmap_sgtable(db_attach->dev, sgt, attach->dma_dir,
+ DMA_ATTR_SKIP_CPU_SYNC);
sg_free_table(sgt);
kfree(attach);
db_attach->priv = NULL;
@@ -301,8 +300,8 @@ static struct sg_table *vb2_dc_dmabuf_ops_map(
/* release any previous cache */
if (attach->dma_dir != DMA_NONE) {
- dma_unmap_sg_attrs(db_attach->dev, sgt->sgl, sgt->orig_nents,
- attach->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
+ dma_unmap_sgtable(db_attach->dev, sgt, attach->dma_dir,
+ DMA_ATTR_SKIP_CPU_SYNC);
attach->dma_dir = DMA_NONE;
}
@@ -310,9 +309,8 @@ static struct sg_table *vb2_dc_dmabuf_ops_map(
* mapping to the client with new direction, no cache sync
* required see comment in vb2_dc_dmabuf_ops_detach()
*/
- sgt->nents = dma_map_sg_attrs(db_attach->dev, sgt->sgl, sgt->orig_nents,
- dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
- if (!sgt->nents) {
+ if (dma_map_sgtable(db_attach->dev, sgt, dma_dir,
+ DMA_ATTR_SKIP_CPU_SYNC)) {
pr_err("failed to map scatterlist\n");
mutex_unlock(lock);
return ERR_PTR(-EIO);
@@ -455,8 +453,8 @@ static void vb2_dc_put_userptr(void *buf_priv)
* No need to sync to CPU, it's already synced to the CPU
* since the finish() memop will have been called before this.
*/
- dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents,
- buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
+ dma_unmap_sgtable(buf->dev, sgt, buf->dma_dir,
+ DMA_ATTR_SKIP_CPU_SYNC);
pages = frame_vector_pages(buf->vec);
/* sgt should exist only if vector contains pages... */
BUG_ON(IS_ERR(pages));
@@ -553,9 +551,8 @@ static void *vb2_dc_get_userptr(struct device *dev, unsigned long vaddr,
* No need to sync to the device, this will happen later when the
* prepare() memop is called.
*/
- sgt->nents = dma_map_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents,
- buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
- if (sgt->nents <= 0) {
+ if (dma_map_sgtable(buf->dev, sgt, buf->dma_dir,
+ DMA_ATTR_SKIP_CPU_SYNC)) {
pr_err("failed to map scatterlist\n");
ret = -EIO;
goto fail_sgt_init;
@@ -577,8 +574,7 @@ static void *vb2_dc_get_userptr(struct device *dev, unsigned long vaddr,
return buf;
fail_map_sg:
- dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents,
- buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
+ dma_unmap_sgtable(buf->dev, sgt, buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
fail_sgt_init:
sg_free_table(sgt);
diff --git a/drivers/media/common/videobuf2/videobuf2-dma-sg.c b/drivers/media/common/videobuf2/videobuf2-dma-sg.c
index 0a40e00f0d7e..0dd3b19025e0 100644
--- a/drivers/media/common/videobuf2/videobuf2-dma-sg.c
+++ b/drivers/media/common/videobuf2/videobuf2-dma-sg.c
@@ -148,9 +148,8 @@ static void *vb2_dma_sg_alloc(struct device *dev, unsigned long dma_attrs,
* No need to sync to the device, this will happen later when the
* prepare() memop is called.
*/
- sgt->nents = dma_map_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents,
- buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
- if (!sgt->nents)
+ if (dma_map_sgtable(buf->dev, sgt, buf->dma_dir,
+ DMA_ATTR_SKIP_CPU_SYNC))
goto fail_map;
buf->handler.refcount = &buf->refcount;
@@ -186,8 +185,8 @@ static void vb2_dma_sg_put(void *buf_priv)
if (refcount_dec_and_test(&buf->refcount)) {
dprintk(1, "%s: Freeing buffer of %d pages\n", __func__,
buf->num_pages);
- dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents,
- buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
+ dma_unmap_sgtable(buf->dev, sgt, buf->dma_dir,
+ DMA_ATTR_SKIP_CPU_SYNC);
if (buf->vaddr)
vm_unmap_ram(buf->vaddr, buf->num_pages);
sg_free_table(buf->dma_sgt);
@@ -204,8 +203,7 @@ static void vb2_dma_sg_prepare(void *buf_priv)
struct vb2_dma_sg_buf *buf = buf_priv;
struct sg_table *sgt = buf->dma_sgt;
- dma_sync_sg_for_device(buf->dev, sgt->sgl, sgt->orig_nents,
- buf->dma_dir);
+ dma_sync_sgtable_for_device(buf->dev, sgt, buf->dma_dir);
}
static void vb2_dma_sg_finish(void *buf_priv)
@@ -213,7 +211,7 @@ static void vb2_dma_sg_finish(void *buf_priv)
struct vb2_dma_sg_buf *buf = buf_priv;
struct sg_table *sgt = buf->dma_sgt;
- dma_sync_sg_for_cpu(buf->dev, sgt->sgl, sgt->orig_nents, buf->dma_dir);
+ dma_sync_sgtable_for_cpu(buf->dev, sgt, buf->dma_dir);
}
static void *vb2_dma_sg_get_userptr(struct device *dev, unsigned long vaddr,
@@ -256,9 +254,8 @@ static void *vb2_dma_sg_get_userptr(struct device *dev, unsigned long vaddr,
* No need to sync to the device, this will happen later when the
* prepare() memop is called.
*/
- sgt->nents = dma_map_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents,
- buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
- if (!sgt->nents)
+ if (dma_map_sgtable(buf->dev, sgt, buf->dma_dir,
+ DMA_ATTR_SKIP_CPU_SYNC))
goto userptr_fail_map;
return buf;
@@ -284,8 +281,7 @@ static void vb2_dma_sg_put_userptr(void *buf_priv)
dprintk(1, "%s: Releasing userspace buffer of %d pages\n",
__func__, buf->num_pages);
- dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents, buf->dma_dir,
- DMA_ATTR_SKIP_CPU_SYNC);
+ dma_unmap_sgtable(buf->dev, sgt, buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
if (buf->vaddr)
vm_unmap_ram(buf->vaddr, buf->num_pages);
sg_free_table(buf->dma_sgt);
@@ -408,8 +404,7 @@ static void vb2_dma_sg_dmabuf_ops_detach(struct dma_buf *dbuf,
/* release the scatterlist cache */
if (attach->dma_dir != DMA_NONE)
- dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
- attach->dma_dir);
+ dma_unmap_sgtable(db_attach->dev, sgt, attach->dma_dir, 0);
sg_free_table(sgt);
kfree(attach);
db_attach->priv = NULL;
@@ -434,15 +429,12 @@ static struct sg_table *vb2_dma_sg_dmabuf_ops_map(
/* release any previous cache */
if (attach->dma_dir != DMA_NONE) {
- dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
- attach->dma_dir);
+ dma_unmap_sgtable(db_attach->dev, sgt, attach->dma_dir, 0);
attach->dma_dir = DMA_NONE;
}
/* mapping to the client with new direction */
- sgt->nents = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
- dma_dir);
- if (!sgt->nents) {
+ if (dma_map_sgtable(db_attach->dev, sgt, dma_dir, 0)) {
pr_err("failed to map scatterlist\n");
mutex_unlock(lock);
return ERR_PTR(-EIO);
diff --git a/drivers/media/common/videobuf2/videobuf2-vmalloc.c b/drivers/media/common/videobuf2/videobuf2-vmalloc.c
index c66fda4a65e4..bf5ac63a5742 100644
--- a/drivers/media/common/videobuf2/videobuf2-vmalloc.c
+++ b/drivers/media/common/videobuf2/videobuf2-vmalloc.c
@@ -229,7 +229,7 @@ static int vb2_vmalloc_dmabuf_ops_attach(struct dma_buf *dbuf,
kfree(attach);
return ret;
}
- for_each_sg(sgt->sgl, sg, sgt->nents, i) {
+ for_each_sgtable_sg(sgt, sg, i) {
struct page *page = vmalloc_to_page(vaddr);
if (!page) {
@@ -259,8 +259,7 @@ static void vb2_vmalloc_dmabuf_ops_detach(struct dma_buf *dbuf,
/* release the scatterlist cache */
if (attach->dma_dir != DMA_NONE)
- dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
- attach->dma_dir);
+ dma_unmap_sgtable(db_attach->dev, sgt, attach->dma_dir, 0);
sg_free_table(sgt);
kfree(attach);
db_attach->priv = NULL;
@@ -285,15 +284,12 @@ static struct sg_table *vb2_vmalloc_dmabuf_ops_map(
/* release any previous cache */
if (attach->dma_dir != DMA_NONE) {
- dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
- attach->dma_dir);
+ dma_unmap_sgtable(db_attach->dev, sgt, attach->dma_dir, 0);
attach->dma_dir = DMA_NONE;
}
/* mapping to the client with new direction */
- sgt->nents = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
- dma_dir);
- if (!sgt->nents) {
+ if (dma_map_sgtable(db_attach->dev, sgt, dma_dir, 0)) {
pr_err("failed to map scatterlist\n");
mutex_unlock(lock);
return ERR_PTR(-EIO);
--
2.17.1
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next prev parent reply other threads:[~2020-08-26 6:36 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20200826063527eucas1p21ab50cf46bad1d9ea5d7f202dd6ec722@eucas1p2.samsung.com>
2020-08-26 6:32 ` [PATCH v9 00/32] DRM: fix struct sg_table nents vs. orig_nents misuse Marek Szyprowski
[not found] ` <CGME20200826063527eucas1p1d68954adf1c25e1d760b92ca0845ab48@eucas1p1.samsung.com>
2020-08-26 6:32 ` [PATCH v9 01/32] drm: prime: add common helper to check scatterlist contiguity Marek Szyprowski
2020-09-01 17:23 ` Robin Murphy
[not found] ` <CGME20200826063528eucas1p1502c849c0fd337245541e1b31352d87f@eucas1p1.samsung.com>
2020-08-26 6:32 ` [PATCH v9 02/32] drm: prime: use sgtable iterators in drm_prime_sg_to_page_addr_arrays() Marek Szyprowski
2020-09-01 17:24 ` Robin Murphy
[not found] ` <CGME20200826063529eucas1p19d797cf74bf653bf68b0a0e860806dbf@eucas1p1.samsung.com>
2020-08-26 6:32 ` [PATCH v9 03/32] drm: core: fix common struct sg_table related issues Marek Szyprowski
2020-09-01 17:46 ` Robin Murphy
[not found] ` <CGME20200826063529eucas1p24a398fd2bacf53a33a14d7977a097f61@eucas1p2.samsung.com>
2020-08-26 6:32 ` [PATCH v9 04/32] drm: armada: " Marek Szyprowski
2020-09-01 18:26 ` Robin Murphy
[not found] ` <CGME20200826063530eucas1p16acb847d7da0ea734bef507688a76c5a@eucas1p1.samsung.com>
2020-08-26 6:32 ` [PATCH v9 05/32] drm: etnaviv: " Marek Szyprowski
2020-09-01 18:39 ` Robin Murphy
[not found] ` <CGME20200826063531eucas1p21c9277fe2a91e632e40822fb04a2c095@eucas1p2.samsung.com>
2020-08-26 6:32 ` [PATCH v9 06/32] drm: exynos: use common helper for a scatterlist contiguity check Marek Szyprowski
[not found] ` <CGME20200826063531eucas1p18dbb3c42b2ecc490360e7a75cf579af6@eucas1p1.samsung.com>
2020-08-26 6:32 ` [PATCH v9 07/32] drm: exynos: fix common struct sg_table related issues Marek Szyprowski
[not found] ` <CGME20200826063532eucas1p2a9e0215f483104d45af0560d5dbfa8e0@eucas1p2.samsung.com>
2020-08-26 6:32 ` [PATCH v9 08/32] drm: i915: " Marek Szyprowski
2020-09-01 18:42 ` Robin Murphy
2020-09-01 19:38 ` [Intel-gfx] " Ruhl, Michael J
2020-09-01 19:54 ` Robin Murphy
2020-09-01 20:32 ` Ruhl, Michael J
[not found] ` <CGME20200826063533eucas1p1e346ac4a683f929be8adc344b3fe9ea0@eucas1p1.samsung.com>
2020-08-26 6:32 ` [PATCH v9 09/32] drm: lima: " Marek Szyprowski
[not found] ` <CGME20200826063533eucas1p1fad2f2afb117b026081468d2d840ab0f@eucas1p1.samsung.com>
2020-08-26 6:32 ` [PATCH v9 10/32] drm: mediatek: use common helper for a scatterlist contiguity check Marek Szyprowski
2020-09-01 18:44 ` Robin Murphy
2020-09-01 22:59 ` Chun-Kuang Hu
[not found] ` <CGME20200826063534eucas1p2647f5e9679f79f568e184b092f743f8b@eucas1p2.samsung.com>
2020-08-26 6:32 ` [PATCH v9 11/32] drm: mediatek: use common helper for extracting pages array Marek Szyprowski
2020-09-01 18:54 ` Robin Murphy
2020-09-01 23:16 ` Chun-Kuang Hu
[not found] ` <CGME20200826063535eucas1p10cef37d8364216cf57c97e96d3959dd2@eucas1p1.samsung.com>
2020-08-26 6:32 ` [PATCH v9 12/32] drm: msm: fix common struct sg_table related issues Marek Szyprowski
2020-08-26 13:26 ` kernel test robot
2020-09-01 19:14 ` Robin Murphy
2020-09-01 23:48 ` Rob Clark
[not found] ` <CGME20200826063535eucas1p1a98e3295a64f14d475371ac0b003782f@eucas1p1.samsung.com>
2020-08-26 6:32 ` [PATCH v9 13/32] drm: omapdrm: use common helper for extracting pages array Marek Szyprowski
2020-09-01 19:17 ` Robin Murphy
[not found] ` <CGME20200826063536eucas1p2e29d2b061b8b74c06c9ea61ad6737ba2@eucas1p2.samsung.com>
2020-08-26 6:32 ` [PATCH v9 14/32] drm: omapdrm: fix common struct sg_table related issues Marek Szyprowski
2020-09-01 19:33 ` Robin Murphy
2020-09-02 8:00 ` Tomi Valkeinen via iommu
2020-09-04 12:06 ` Marek Szyprowski
2020-09-04 12:27 ` Marek Szyprowski
[not found] ` <CGME20200826063536eucas1p2d9ea013228bcfbd5778959274aa01b78@eucas1p2.samsung.com>
2020-08-26 6:32 ` [PATCH v9 15/32] drm: panfrost: " Marek Szyprowski
[not found] ` <CGME20200826063537eucas1p1462d4761c8eb6d762fe5ea0fbd3b6e3b@eucas1p1.samsung.com>
2020-08-26 6:33 ` [PATCH v9 16/32] drm: rockchip: use common helper for a scatterlist contiguity check Marek Szyprowski
2020-09-01 19:34 ` Robin Murphy
[not found] ` <CGME20200826063537eucas1p2d9a362f619920ad84c46f36cd13ec362@eucas1p2.samsung.com>
2020-08-26 6:33 ` [PATCH v9 17/32] drm: rockchip: fix common struct sg_table related issues Marek Szyprowski
2020-09-01 20:00 ` Robin Murphy
[not found] ` <CGME20200826063538eucas1p2a9fe42c2ccee634c41ba9f3dd43dc3c4@eucas1p2.samsung.com>
2020-08-26 6:33 ` [PATCH v9 18/32] drm: tegra: " Marek Szyprowski
2020-09-01 20:11 ` Robin Murphy
[not found] ` <CGME20200826063539eucas1p2ed946c6214cdb8574ab288350db22f1a@eucas1p2.samsung.com>
2020-08-26 6:33 ` [PATCH v9 19/32] drm: v3d: " Marek Szyprowski
[not found] ` <CGME20200826063539eucas1p2cb72ff20abae82c3e027833f958fd7a1@eucas1p2.samsung.com>
2020-08-26 6:33 ` [PATCH v9 20/32] drm: virtio: " Marek Szyprowski
[not found] ` <CGME20200826063540eucas1p2e9f9f9133322205269e50fd01bf64bcc@eucas1p2.samsung.com>
2020-08-26 6:33 ` [PATCH v9 21/32] drm: vmwgfx: " Marek Szyprowski
[not found] ` <CGME20200826063540eucas1p2dc6829c66ae13b8e787ca40b9aede3df@eucas1p2.samsung.com>
2020-08-26 6:33 ` [PATCH v9 22/32] drm: xen: " Marek Szyprowski
[not found] ` <CGME20200826063541eucas1p2ec5d8a396f52ce690641659b74819e60@eucas1p2.samsung.com>
2020-08-26 6:33 ` [PATCH v9 23/32] xen: gntdev: " Marek Szyprowski
[not found] ` <CGME20200826063542eucas1p1713d37f4589ddaca27e1968b5fe44027@eucas1p1.samsung.com>
2020-08-26 6:33 ` [PATCH v9 24/32] drm: host1x: " Marek Szyprowski
2020-09-01 20:13 ` Robin Murphy
[not found] ` <CGME20200826063542eucas1p18d9d201e3e26c08d26c3ea2a2b2a079d@eucas1p1.samsung.com>
2020-08-26 6:33 ` [PATCH v9 25/32] drm: rcar-du: " Marek Szyprowski
[not found] ` <CGME20200826063543eucas1p1c2fde4802f125f25caa02f4453b8a284@eucas1p1.samsung.com>
2020-08-26 6:33 ` [PATCH v9 26/32] dmabuf: " Marek Szyprowski
[not found] ` <CGME20200826063544eucas1p230abe33c28618e82608c5b40eb50fa87@eucas1p2.samsung.com>
2020-08-26 6:33 ` [PATCH v9 27/32] staging: tegra-vde: " Marek Szyprowski
[not found] ` <CGME20200826063544eucas1p15980885bbdbc43e35f350f228994bee7@eucas1p1.samsung.com>
2020-08-26 6:33 ` [PATCH v9 28/32] misc: fastrpc: " Marek Szyprowski
2020-09-01 20:14 ` Robin Murphy
[not found] ` <CGME20200826063545eucas1p22eb2c7a643a299f3e1696b4c5bae0694@eucas1p2.samsung.com>
2020-08-26 6:33 ` [PATCH v9 29/32] rapidio: " Marek Szyprowski
2020-09-01 20:15 ` Robin Murphy
[not found] ` <CGME20200826063546eucas1p268558dcd08ac9b43843f9f5e23da227d@eucas1p2.samsung.com>
2020-08-26 6:33 ` [PATCH v9 30/32] samples: vfio-mdev/mbochs: " Marek Szyprowski
2020-09-01 20:16 ` Robin Murphy
[not found] ` <CGME20200826063629eucas1p1a3c9c93e281b4c432a6d9940e734e3c4@eucas1p1.samsung.com>
2020-08-26 6:33 ` [PATCH v9 31/32] media: pci: fix common ALSA DMA-mapping related codes Marek Szyprowski
2020-09-01 20:24 ` Robin Murphy
[not found] ` <CGME20200826063629eucas1p194665c749b5a37c74e6445370fd7f7c4@eucas1p1.samsung.com>
2020-08-26 6:33 ` Marek Szyprowski [this message]
2020-09-01 20:19 ` [PATCH v9 32/32] videobuf2: use sgtable-based scatterlist wrappers Robin Murphy
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