6.6-stable review patch. If anyone has any objections, please let me know.
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From: Dan Carpenter dan.carpenter@linaro.org
[ Upstream commit 6471da5ee311d53ef46eebcb7725bc94266cc0cf ]
The "ret" variable is declared as ssize_t and it can hold negative error codes but the "rk_obj->base.size" variable is type size_t. This means that when we compare them, they are both type promoted to size_t and the negative error code becomes a high unsigned value and is treated as success. Add a cast to fix this.
Fixes: 38f993b7c59e ("drm/rockchip: Do not use DMA mapping API if attached to IOMMU domain") Signed-off-by: Dan Carpenter dan.carpenter@linaro.org Signed-off-by: Heiko Stuebner heiko@sntech.de Link: https://patchwork.freedesktop.org/patch/msgid/2bfa28b5-145d-4b9e-a18a-98819d... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c index b8f8b45ebf594..93ed841f5dcea 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c @@ -40,7 +40,7 @@ static int rockchip_gem_iommu_map(struct rockchip_gem_object *rk_obj)
ret = iommu_map_sgtable(private->domain, rk_obj->dma_addr, rk_obj->sgt, prot); - if (ret < rk_obj->base.size) { + if (ret < (ssize_t)rk_obj->base.size) { DRM_ERROR("failed to map buffer: size=%zd request_size=%zd\n", ret, rk_obj->base.size); ret = -ENOMEM;