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From: Shane Francis <bigbeeshane@gmail.com>
To: dri-devel@lists.freedesktop.org
Cc: airlied@linux.ie, bigbeeshane@gmail.com,
	alexander.deucher@amd.com, christian.koenig@amd.com
Subject: [PATCH v3 3/3] drm/radeon: fix scatter-gather mapping with user pages
Date: Wed, 25 Mar 2020 00:24:50 +0000	[thread overview]
Message-ID: <20200325002450.5240-4-bigbeeshane@gmail.com> (raw)
In-Reply-To: <20200325002450.5240-1-bigbeeshane@gmail.com>

Calls to dma_map_sg may return segments / entries than requested
if they fall on page bounderies. The old implementation did not
support this use case.

Signed-off-by: Shane Francis <bigbeeshane@gmail.com>
---
 drivers/gpu/drm/radeon/radeon_ttm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index 3b92311d30b9..b3380ffab4c2 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -528,7 +528,7 @@ static int radeon_ttm_tt_pin_userptr(struct ttm_tt *ttm)
 
 	r = -ENOMEM;
 	nents = dma_map_sg(rdev->dev, ttm->sg->sgl, ttm->sg->nents, direction);
-	if (nents != ttm->sg->nents)
+	if (nents == 0)
 		goto release_sg;
 
 	drm_prime_sg_to_page_addr_arrays(ttm->sg, ttm->pages,
-- 
2.26.0

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      parent reply	other threads:[~2020-03-25  0:26 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-25  0:24 [PATCH v3 0/3] AMDGPU / RADEON / DRM Fix mapping of user pages Shane Francis
2020-03-25  0:24 ` [PATCH v3 1/3] drm/prime: use length macro when mapping sgl Shane Francis
2020-03-25  7:54   ` Christian König
2020-03-25  0:24 ` [PATCH v3 2/3] drm/amdgpu: fix scatter-gather mapping with user pages Shane Francis
2020-03-25  0:24 ` Shane Francis [this message]

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