[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20200331085435.153059838@linuxfoundation.org>
Date: Tue, 31 Mar 2020 10:58:37 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Shane Francis <bigbeeshane@...il.com>,
"Michael J. Ruhl" <michael.j.ruhl@...el.com>,
Alex Deucher <alexander.deucher@....com>
Subject: [PATCH 5.5 103/170] drm/prime: use dma length macro when mapping sg
From: Shane Francis <bigbeeshane@...il.com>
commit 42e67b479eab6d26459b80b4867298232b0435e7 upstream.
As dma_map_sg can reorganize scatter-gather lists in a
way that can cause some later segments to be empty we should
always use the sg_dma_len macro to fetch the actual length.
This could now be 0 and not need to be mapped to a page or
address array
Fixes: be62dbf554c5 ("iommu/amd: Convert AMD iommu driver to the dma-iommu api")
Bug: https://bugzilla.kernel.org/show_bug.cgi?id=206461
Bug: https://bugzilla.kernel.org/show_bug.cgi?id=206895
Bug: https://gitlab.freedesktop.org/drm/amd/issues/1056
Signed-off-by: Shane Francis <bigbeeshane@...il.com>
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@...el.com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200325090741.21957-2-bigbeeshane@gmail.com
Cc: stable@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/gpu/drm/drm_prime.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -964,7 +964,7 @@ int drm_prime_sg_to_page_addr_arrays(str
index = 0;
for_each_sg(sgt->sgl, sg, sgt->nents, count) {
- len = sg->length;
+ len = sg_dma_len(sg);
page = sg_page(sg);
addr = sg_dma_address(sg);
Powered by blists - more mailing lists