linux-kernel - [PATCH] drm/ttm: Fix address passed to dma_mapping_error() in ttm_pool

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Message-Id: <20210111164033.695968-1-jcline@redhat.com>
Date:   Mon, 11 Jan 2021 11:40:33 -0500
From:   Jeremy Cline <jcline@...hat.com>
To:     Christian Koenig <christian.koenig@....com>,
        Huang Rui <ray.huang@....com>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Jeremy Cline <jcline@...hat.com>
Subject: [PATCH] drm/ttm: Fix address passed to dma_mapping_error() in ttm_pool_map()

check_unmap() is producing a warning about a missing map error check.
The return value from dma_map_page() should be checked for an error, not
the caller-provided dma_addr.

Fixes: d099fc8f540a ("drm/ttm: new TT backend allocation pool v3")
Signed-off-by: Jeremy Cline <jcline@...hat.com>
---
 drivers/gpu/drm/ttm/ttm_pool.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c
index 7b2f60616750..0aa197204b08 100644
--- a/drivers/gpu/drm/ttm/ttm_pool.c
+++ b/drivers/gpu/drm/ttm/ttm_pool.c
@@ -190,7 +190,7 @@ static int ttm_pool_map(struct ttm_pool *pool, unsigned int order,
 		size_t size = (1ULL << order) * PAGE_SIZE;
 
 		addr = dma_map_page(pool->dev, p, 0, size, DMA_BIDIRECTIONAL);
-		if (dma_mapping_error(pool->dev, **dma_addr))
+		if (dma_mapping_error(pool->dev, addr))
 			return -EFAULT;
 	}
 
-- 
2.29.2